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International Journal of Modern Research in Engineering and Technology (IJMRET)
www.ijmret.org Volume 3 Issue 12 ǁ December 2018.
w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 5
Production and Analysis of Bioresin From Mango
(Mangifera Indica) Kernel Oil
A. S. Sadiq1*
, A. A. Bello1
, A. Tokan1
and S. Abdulsam2
(1
Department of Mechanical and Production Engineering, Abubakar Tafawa Balewa University, Bauchi,
Nigeria.
2
Department of Chemical Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria.)
ABSTRACT: The work presents report on production and analysis of bioresin from epoxidized mango kernel
oil (EMKO). The bioresin (acrylated epoxidized mango kernel oil) or AEMKO was produced from epoxidized
mango kernel oil via acrylation chemical reaction route. The FTIR spectrum analysis of epoxidized mango
kernel oil (EMKO) and acrylated epoxidized mango kernel oil (AEMKO) produced gave the degree of
acrylation (DOA) as 46%. The Viscosity of AEMKO (resin) was determined at room temperature (25 °C) to be
387cP while the density at 25o
C was 1.2 g/cm3.
The glass transition temperature (Tg) of the bioresin was
determined to be 95o
C. Production cost analysis of the bioresin was done and found to be N8, 804.35 per litre.
The high cost was due to high costs of the chemicals, labour and overhead charges involved at my local level. At
commercial level, those components of the costs would definitely reduce to the level compatible with synthetic
(polyester) resin (N2, 500 per litre) currently sold by some markers in Nigeria. However, the overall results of
the work demonstrated that bioresin can be successfully synthesized from mango kernel oil with properties
compatible with ASTM standards. The commercial production of the bioresin will go a long way in mitigating
some of the challenges associated with total use of fossil fuel currently use for production of bulk of synthetic
resins for composite manufacturing activities.
KEYWORDS: Acrylation, Bioresin, Composite material, Epoxidized oil, Mango kernel oil,
Synthetic resin.
I. Introduction
Many of the modern technologies
nowadays require light materials with unusual
combinations of properties that cannot or easily be
met by the conventional materials such as metals
and their alloys, one of these materials that is
relatively new in many countries is Fibre reinforced
polymer (FRP) material commonly called composite
material. It is one of the emerging materials widely
used in the fields of Air, Land and Sea
transportation among others for production of light
materials that have high strength to weight ratio, [1].
Composite material generally consists of two
major constituents, reinforcement (fibre) and matrix
(commonly called resin). Resin, which is the central
focus of this work, is defined by [2] as a viscous and
transparent liquid either from organic or inorganic
source that will transform (cured and hardened) into
solid when treated with suitable catalyst, accelerator
with or without heat. Those from inorganic sources
(such as crude oil or chemicals) are commonly
called synthetic resins while those from organic
sources (such as plant or animal) are called bioresin
or renewable resins.
Resin (polymer matrix) that is widely used for
composite material production has several functions;
it is a binder that holds the reinforcement in place, it
transfers external loads to the reinforcement and
protect them from adverse environmental effects,
[1]. According to [3], the matrix redistributes the
load to surrounding fibers when an individual fiber
International Journal of Modern Research in Engineering and Technology (IJMRET)
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fractures and laterally supports the fibers to prevent
buckling in compression among others.
The major source of synthetic resins is crude
oil and the global demand for crude oil is increasing
year by year despite the discovery of more oil fields
in some countries including Nigeria. The finite
nature of the major source (crude oil) of synthetic
resins and increasing global use of composite
materials for wide range of engineering applications
call for concerted efforts to source for alternative
material that is renewable and sustainable for
composite resins, [1]
Despite the numerous engineering applications
of composite materials, it was captured in the
reports of [4] and [5] respectively, that the bulk of
the resins and many other polymers matrices used
for composite activities across the globe are
produced from non renewable Petrochemicals
substances like Xylene, ethylene, propylene;
benzene and vinyl chloride by polymerization
processes. In addition, some health related illnesses
such as respiratory tract infections and some skin
infections have been reported to be associated with
production process of these synthetic resins.
In addition to the above challenges of synthetic
resins, it was reported by [6] that the bulk of
synthetic resins used for wide range of engineering
activities in Nigeria are imported materials. Despite
the adverse effects of the importations on our
economy, the materials are not readily available for
use and are only found in few specialize places in
some of the commercial cities.
Concerted efforts have been intensified by
researchers across the globe to mitigate the
challenges posse by continuous and linear use of
synthetic resins (polymer matrices) for composite
activities. This lead to two major processes by
which vegetable or plant oil can be modified or
functionalized to produce bioresin. These are
epoxidation and acrylation chemical reactions, [6].
Epoxidation represents one of the most
important fundamental reactions involving the
triglyceride and specifically involves functionalizing
the double bonds (C=C) between the carbon atoms.
Epoxidation of plant or vegetable oils leads to the
material that is known as epoxidized vegetable oil
(EVO). Epoxidized oil serves as raw material for
synthesis of many industrial chemicals including
bioresins, polymers, lubricants, plasticizers, etc. [7].
According to [8], epoxidized vegetable oil
(EVO) polymers by themselves may be suitable as a
polymeric matrix for composites if blended with
synthetic epoxy resin. Further modifications can be
made on the chemical structure to modify
functionalities. One such modification involves
acrylation of the epoxides formed during
epoxidation reaction.
Acrylation is a chemical reaction where
epoxidized vegetable oil structure is modified for
further functionalities. In this process, epoxy
functional triglyceride of the oil is reacted with
acrylic acid to incorporate acrylate chemical groups
onto the triglyceride thereby attaching vinyl
functionalities to its structure. Acrylation reaction
helps to convert the unreacted epoxides in the oil to
impart further functionalization to the triglyceride
thereby improving the polymer performance. After
this modification, a polymer in the form of an
acrylated epoxidized vegetable oil (AEVO) is
obtained. The conversion of EVO to AEVO allows,
lower curing temperatures, shorter curing times and
improved material properties, [9] and [10].
The aim of this work is to produce and
analyze renewable resin from epoxidized mango
kernel oil (EMKO) for composite application.
Available and sustainable resin from mango kernel
oil will serve as alternative resin for composite
manufacturing activities. This will go a long way in
cushioning the adverse effects of using fossil fuel as
raw material for synthetic resins productions and
consequently mitigates some of the challenges
associated with petrochemical resins.
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II. Materials and Methods
2.1 Materials
Table 1: List of materials, chemical compounds, devices and apparatus.
S/No. Raw material and Chemical
compounds
Devices/Apparatus
1 Epoxidized mango kernel oil Buck infrared spectrophotometer (model 530)
2 Acrylic acid Digital weighing machine (LA 164. B. Brain)
3 Hydroquinone Measuring cylinder
4 Toluene Griffin temperature and adjustable oven
5 Distilled water Conical flask
6 Anhydrous sodium sulfate U-tube Viscometer
7 Pipette
8 Burette
9 prolab efflux viscometer,
10 stop watch
11 2-neckround bottom flask
12 Hot plate equipped with magnetic stirrer
13 Magnetic bit
14 Tripod stand
15 Thermometer
16 Graduated dropping funnel
17 Circulating water bath
18 Separating funnel
2.2 Methods
2.2.1 Production of acrylated epoxidized mango kernel oil (AEMKO)
Acrylated epoxidized mango kernel oil (AEMKO) was prepared according to ASTM standard reported by
[11]. In this study, epoxidized mango kernel oil (EMKO) was reacted with Acrylic acid in a 250 mL round-
bottom flask equipped with a magnetic stirrer and a reflux condenser. Hydroquinone which was used as a free
radical inhibitor was added to the contents in the flask. The molar ratio of EMKO: acrylic acid was 1:10. The
flask was heated to 90°C until the light yellow colour changed to milky colour which indicated complete
reaction. The mixture was cooled to room temperature and diluted with toluene before purifying by washing
with distilled water. The final product was dehydrated with anhydrous sodium sulfate and the solvent was
evaporated using an evaporator. The above procedure was repeated to achieve the quantity of the bioresin
targeted.
Plate 1 showed the sample of epoxidized mango kernel oil (EMKO) that was reacted with acrylic acid to
produce the acrylated epoxidized oil. Plate 2 showed the setup for acrylation reaction in the laboratory while
plate 3 showed the acrylated oil (bioresin) produced.
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Epoxidized oil + Acrylic acid Acrylated epoxidized oil ……… (Eq. 1)
O
O O O-C-CH2=CH2
CH2-O-C-CH-CH-R + CH2=CH-CO2H CH2-O-C-C
Plate 1: Epoxidized mango kernel oil (EMKO)
Plate 2. Setup for Acrylation reaction Plate 3. Bioresin produced from EMKO
2.2.2 Production of Fourier transforms infrared
(FTIR) Spectrum
In this study Buck infrared
spectrophotometer (model 530) was used to produce
the FTIR spectra of the epoxidized and acrylated
epoxidized oils respectively. The 4000–500 cm-1
infrared spectral regions of the oils are shown in
Figures 2 and 3. From the recognized peaks, heights
and wave number on the spectra of each oil sample,
the functional groups corresponding to each wave
number were identified according to [12] and John
[13] interpretation charts. The results are found in
tables 2 and 3.
2.2.3 Determination of Viscosities of the bioresin
The Viscosity of the acrylated epoxidized oil
and the acrylated epoxidized oil mixed with 33% by
weight of styrene were determined at temperature of
25 °C according to ASTM method that involved the
use of Brookfield viscometer apparatus as described
by [14]. The result of the viscosity measurements
are found in table 4.
2.2.4 Determination of the density of the bioresin
The density of the bioresin was determined at
(27o
C) according to ASTM standard obtained from
[15]. The result is found in table 4.
OH
CH - R
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2.2.5 Determination of Glass transition temperature
of the bioresin
The glass transition temperature of the fully
cured bioresin produced was determined using
ASTM method that involved the use of Differential
Mechanical Thermal Analysis (DMTA) described
by [ ]. The result is found in table 4.
2.2.6 Economic Analysis of bioresin from mango
kernel oil
The economic analysis of the bioresin is
centered on the costs implications of the various
activities involved right from the Collection and
processing of mango seeds for oil extraction up till
the production of the bioresin via acrylation method.
i. Collection and processing of mango seeds for oil
extraction
Mango seeds (house the kernels containing oil)
are waste materials that are readily available,
affordable and sustainable in Nigeria and many
other countries. It virtually cost nothing to gather the
seeds during the harvesting season after they are
thrown away by the farmers, users and the
consumers. Processing of the kernels for oil
extraction virtually also cost nothing. The labour
and over head costs associated with the collection of
the seeds were estimated as N200.
ii. Extraction of oil from the seed kernels.
The solvent used for the oil extraction was N-
hexane and it costs N18, 000 for 4 litres used to
extract 3.2 litres of the oil. The labour and over head
costs were estimated as N1, 000 and N500
respectively.
iii. Conversation of the raw oil to epoxidized oil.
The cost of conversion of 3.2 litres of the raw oil
to epoxidized oil was estimated as N5, 000. This
covers the materials (chemicals) estimated as N3,
500 and labour and over costs estimated as N1, 500.
iv. Conversation of epoxidized oil to Resin
The cost of conversion of 3.2 litres of the
epoxidized oil to acrylated oil and later to resin was
estimated as N14, 000. This covers the materials
(chemicals) estimated as N12, 000 while the labour
and over head costs were estimated as N2, 000.
Treatment of acrylated oil to resin involves addition
of Styrene to the acrylated oil to reduce the viscosity
to the level suitable for composite processing. The
viscosity reduction leads to increase volume from
3.2 to 4.6 litres. The chemical, labour and over head
costs were estimated as N1000, N500 and N300
respectively. The summary of total expenses
incurred in the production of the bioresin is shown
in table 5.
III. Results
The results of the Spectra of EMKO and
AEMKO are found on figures 1 and 2 while tables 2
and 3 showed the results of the interpretations of the
FTIR spectra of the figures. Table 4 showed the
result of the viscosity measurements of AEMKO
and treated AEMKO with 33% styrene, density and
the glass transition temperature of the bioresin.
Table 5 showed the summary of the determined
properties of the resin and comparism with ASTM
standards.
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Figure 1. Spectrum of epoxidized mango kernel oil (EMKO)
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Figure 2. Spectrum of acrylated epoxidized mango kernel oil (AMKO)
Table 2. Peak identification of FTIR spectra of Epoxidized mango kernel oil (EMKO) and interpretations
Frequency range
(cm-1
)
Wave number
(cm-1
)
Peak Height
Percent
transmittance (%)
Peak Assignment
(Bond)
730 – 665 728 79.156 C = C
1124 – 1089 1115 75.304 C – O
1200 – 1020 1175 64.812 C - OH
1250 – 1050 1242 77.047 C – O - C
1600 = 1400 1421 87.587 C = C
1600 – 1400 1465 79.321 C = C
1745 -1715 1741 63.687 C= O
2950 - 2840 2854 64.419 C - H
2950 - 2840 2925 54.720 C - H
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Table 3. Peak identification of FTIR spectra of Acrylated mango kernel oil (AEMKO) and interpretations
Frequency range
(cm-1
)
Wave number
(cm-1
)
Peak Height
Percent transmittance
(%)
Peak Assignment
(Bond)
730 – 665 698 81.088 C = C
840 – 790 736 74.413 C = C
840 – 790 821 44.600 C = C
840 - 915 866 60.797 C = C
915 – 985 929 58.537 C = C
915 – 985 985 44.510 C = C
1050 – 1048 1048 68.340 CO – O = CO
1085 – 1050 1063 70.688 C = O
1250 -1050 1242 41.731 C – O - C
1480 – 1440 1436 54.859 CH2
1680 – 1600 1618 62.151 C = C
1680 – 1600 1637 56.393 C – C
1700 – 1500 1700 20.619 C = O
2830 – 2695 2661 85.055 C – H
2950 - 2695 2933 75.935 C - H
Table 4: Summary of determined properties of the bioresin
S/NO. Parameters Determined value
1 Iodine value (IV) of renewable oil suitable
for bioresin synthesis
60.7mg iodine/100g oil
2 Degree of Epoxidation (DOE) 69.4%
3 Degree of Acrylation (DOA) 46%
4 Viscosity 387Cp
5 Density 1.2g/cm3
6 Glass transition temperature (Tg) 95o
C
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Table 5: Summary of total expenses incurred in the production of bioresin from mango kernel oil.
S/No. Criteria Material cost
(N)
Labour cost
(N)
Over head cost
(N)
1 Collection and processing of mango seeds
for oil extraction
-------- …… 200
2 Extraction of oil from the seed kernels. 18,000 1,000 500
3 Conversation of the raw oil to epoxidized
oil
3,500 1,000 500
4 Conversation of the epoxidized oil to
Resin
12,000 1,500 500
5 Treatment of acrylated epoxidized oil
with 33% styrene so as to reduce viscosity
to acceptable level
1,000 500 300
Total 34, 500 4,000 2, 000
The cost of one (1) litre of the resin =
𝑀𝑎𝑡𝑒𝑟𝑖𝑎𝑙 𝑐𝑜𝑠𝑡 +𝐿𝑎𝑏𝑜𝑢𝑟 𝑐𝑜𝑠𝑡 +𝑂𝑣𝑒𝑟 ℎ𝑒𝑎𝑑 𝑐𝑜𝑠𝑡
4.6
=
𝑁40,500
4.6
= N8, 804.35
The high cost of production is due to the high costs of chemicals and the labours involved. At commercial
level, these components of costs would definitely reduce to the level compatible with synthetic (polyester) resin
(N2, 500 per litre) currently sold by some markers in Nigeria.
IV. Discussion
Epoxidized mango kernel oil (EMKO)
which serves as a raw material for bioresin
production by acrylation method was previously
produced with 69.4% DOE as explained by [6]. The
acrylation reaction conducted on EMKO in this
study is a further modification on the chemical
structure where the epoxy functional triglyceride of
the epoxidized oil was made to react with acrylic
acid so as incorporates acrylate chemical groups
onto the triglyceride to yield vinyl functionalities
structure.
Although epoxidized vegetable oil (EVO) may be
suitable as a polymeric matrix for composites
applications if blended with synthetic epoxies, but
acrylation of the epoxidized oil according to
According to [7] and [8], gives better properties
(such as lower curing temperatures, shorter curing
times and improved properties) on the resin.
According to [16], vinylesters are processed
the same way as unsaturated polyesters despite the
difference in the chemical structure. The crosslinkng
reaction of vinylester is identical to the free-radical
crosslinkng of unsaturated polyesters and the same
crosslinkng agents, initiators, acceleretors and
inhibitors used for polyesters are also used for
vinylesters. This is underscores the reason why
acrylation reaction is carried out on the epoxidized
oil.
The FTIR spectrum of the epoxidized and the
acrylated oils respectively were determined using
Buck infrared spectrophotometer (model 530). The
FTIR spectrum were used to monitor the epoxidation
and acrylation reactions by analyzing the peaks
pertinent to C=C consumption and epoxide and
acrylate formation. Figure 1 presents the spectra of
EMKO while figure 2 shows the spectra of
AEMKO. On each of the spectrum, significant areas
at specific wave numbers, peak heights and the
possible functional groups were documented as
shown in tables 2 and 3. The shape of the plot (wave
number against transmittance) of the EMKO is
different from that of the AEMKO which indicated
that some transformations took place during the
reaction of the EMKO with acrylic acid.
Considering the spectrum of the EMKO (i.e.
figure 1), there are many peaks where the carbon
double bond functional groups that were not
completely reacted during the epoxidation reaction
resurfaced (i.e. wave number 728,1421, 1465 cm-1
).
However, peak of interest occurs at 1242 cm-1
which
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reflects epoxidized functional group. The carbon
double and the epoxidized functional groups were
responsible for acrylation reaction yield.
Similarly Figure 2 presents the FTIR spectra
associated with the acrylation reaction of the
epoxidized mango kernel oil (EMKO). The spectrum
shows different functional groups including the
carbon double that could not react completely during
the acrylation process. However, the peak of interest
occurs at wave number1241 cm-1
and is associated
with the transformation of epoxy group to acrylate
group, [17] and [18]. Before the acrylation reaction,
the peak height was 77.047% on the epoxidized oil
spectrum and after the acrylation reaction, the peak
reduced to 41.731%. This indicated 35.32%
transformation and gave rise to 46% DOA on the
basis of 100% peak height. Other peaks of interest
occur at wave number 2005 and 2085 cm-.1
.
According to [19], these peaks and others associated
with carbon double are attributed to the formation of
acrylic functional groups in the acrylated epoxidized
oil. Comparing the peak height of wave number
2005 cm-.1
on epoxidized oil and acrylated oil
spectra, only 30.8% transformation took place. This
gave rise to 40% DOA. The low transformation
figures may be unconnected with effective
management of the acrylation chemical reactions
and the low unsaturated nature of the mango kernel
oil as indicated by the iodine value (60.7 mg
iodine/100 g oil) determined and explained by [20].
The viscosity of resin generally has to be such
that can easily be used for production without any
stress. The viscosity of AEMKO without treatment
with styrene was 1632 cP. This figure was too high
for composite processing techniques. Going by
report of [7], there is need to decrease such very
high viscosity by adding about 33% by weight of
styrene to the AEMKO in order to improve
processability for manufacturing composite parts by
traditional composite processing techniques. The
33% by weight of styrene added to the AEMKO
decreased the viscosity to 387 cP. Apart from
decrease in viscosity of AEMKO, the addition of
styrene also increases the volume of the bioresin
from 3.2 to 4.6 litres.
The density of resin is one of the physical
properties that enable one to know the heaviness
(dense nature) of the resin. It gives idea about the
mass of the resin with respect to the volume (space)
occupied. The density of the final product
determined was 1.2g/cm3
.
The glass transition temperature (Tg) is a
thermodynamic property that gives idea about the
working temperature of the fully cured resin. The
(Tg) was determined to be 95o
C. This means that at
95o
C, the polymer begins to turns from a hard and
brittle material to a ductile material.
Production cost analysis of the bioresin was
conducted and gave one litre of it to be N8, 804.35.
The high cost of production is due to the high costs
of chemicals and the labours involved at my local
level in Nigeria.
V. Conclusion
The following conclusions were made
based on the outcome of the work:
1. The acrylation chemical reaction was conducted
using acrylic acid. The degree of acrylation (DOA)
estimated from FTIR spectrum of the epoxidized oil
and the bioresin analysis was 46%. Although the
value is low, it however meets the ASTM standard
of 33 – 94%. The low value of the DOA is a
reflection of the low level of unsaturation of MKO
as dictated by its iodine value (60.7g iodine/100g of
oil) and of course effective management and control
of acrylation process.
2. The analysis of the infrared (IR) spectrum of the
epoxidized oil and the bioresin also indicated that
the oils contain other compounds and bonds apart
from the C=C that form the bases of unsaturation
level for the conversion of the raw oil into
epoxidized oil and the epoxy functional groups that
provides the plate form for conversion into acrylate
groups of the bioresin. These functional groups
contributed in the overall reaction in the epoxidation
and acrylation processes respectively.
3. The dynamic viscosity (1632 cP) of the AEMKO
produced was too high for composite production
activities. This necessitated the addition of 33% by
weight of styrene to the AEMKO thereby decreasing
the viscosity to 387 cP which is within the ASTM
standard range of viscosity (100 to 500 cP at 20o
C)
of resin for composite processing. In addition to the
decrease in viscosity, the 33% by weight of styrene
mixed with AEMKO also increases the volume of
the resin from 3.2 to 4.6 litres.
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4. One of the physical properties of the resin that
enable one to know the heaviness (dense nature) of
the resin, density was determined to be 1.2g/cm3
and
falls within the ASTM standard range of 1.0 –
1.5g/cm3
. The glass transition temperature (Tg)
which is a thermodynamic property that gives idea
about the working temperature of the fully cured
resin was also determined to be 95o
C. This value
meets the ASTM standard range of 80o
C – 110o
C for
bioresins and 80o
C – 280o
C for synthetic resins.
5. Economic analysis of the bioresin estimated one
litre of the resin to be N8, 804.35.
The high cost of production is due to the high costs
of chemicals and the labours involved. At
commercial level, these components of costs would
definitely reduce to the level compatible with
synthetic (polyester) resin (N2, 500 per litre)
currently sold by some markers.
However, when the bioresin produced is compared
with those from soya bean or palm fruit oils or other
eatable oils developed by some researchers, the
bioresin from mango kernel oil has an added
advantage in that the oil is not eatable and more so
the source (mango seed kernel) is a waste material
that is readily available, affordable and sustainable
in Nigeria and many other countries.
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[20.] Sadiq, A. S. Ejilah I. R. and Aroke U. O.
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Production and Analysis of Bioresin From Mango Kernel Oil

  • 1. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 5 Production and Analysis of Bioresin From Mango (Mangifera Indica) Kernel Oil A. S. Sadiq1* , A. A. Bello1 , A. Tokan1 and S. Abdulsam2 (1 Department of Mechanical and Production Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria. 2 Department of Chemical Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria.) ABSTRACT: The work presents report on production and analysis of bioresin from epoxidized mango kernel oil (EMKO). The bioresin (acrylated epoxidized mango kernel oil) or AEMKO was produced from epoxidized mango kernel oil via acrylation chemical reaction route. The FTIR spectrum analysis of epoxidized mango kernel oil (EMKO) and acrylated epoxidized mango kernel oil (AEMKO) produced gave the degree of acrylation (DOA) as 46%. The Viscosity of AEMKO (resin) was determined at room temperature (25 °C) to be 387cP while the density at 25o C was 1.2 g/cm3. The glass transition temperature (Tg) of the bioresin was determined to be 95o C. Production cost analysis of the bioresin was done and found to be N8, 804.35 per litre. The high cost was due to high costs of the chemicals, labour and overhead charges involved at my local level. At commercial level, those components of the costs would definitely reduce to the level compatible with synthetic (polyester) resin (N2, 500 per litre) currently sold by some markers in Nigeria. However, the overall results of the work demonstrated that bioresin can be successfully synthesized from mango kernel oil with properties compatible with ASTM standards. The commercial production of the bioresin will go a long way in mitigating some of the challenges associated with total use of fossil fuel currently use for production of bulk of synthetic resins for composite manufacturing activities. KEYWORDS: Acrylation, Bioresin, Composite material, Epoxidized oil, Mango kernel oil, Synthetic resin. I. Introduction Many of the modern technologies nowadays require light materials with unusual combinations of properties that cannot or easily be met by the conventional materials such as metals and their alloys, one of these materials that is relatively new in many countries is Fibre reinforced polymer (FRP) material commonly called composite material. It is one of the emerging materials widely used in the fields of Air, Land and Sea transportation among others for production of light materials that have high strength to weight ratio, [1]. Composite material generally consists of two major constituents, reinforcement (fibre) and matrix (commonly called resin). Resin, which is the central focus of this work, is defined by [2] as a viscous and transparent liquid either from organic or inorganic source that will transform (cured and hardened) into solid when treated with suitable catalyst, accelerator with or without heat. Those from inorganic sources (such as crude oil or chemicals) are commonly called synthetic resins while those from organic sources (such as plant or animal) are called bioresin or renewable resins. Resin (polymer matrix) that is widely used for composite material production has several functions; it is a binder that holds the reinforcement in place, it transfers external loads to the reinforcement and protect them from adverse environmental effects, [1]. According to [3], the matrix redistributes the load to surrounding fibers when an individual fiber
  • 2. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 6 fractures and laterally supports the fibers to prevent buckling in compression among others. The major source of synthetic resins is crude oil and the global demand for crude oil is increasing year by year despite the discovery of more oil fields in some countries including Nigeria. The finite nature of the major source (crude oil) of synthetic resins and increasing global use of composite materials for wide range of engineering applications call for concerted efforts to source for alternative material that is renewable and sustainable for composite resins, [1] Despite the numerous engineering applications of composite materials, it was captured in the reports of [4] and [5] respectively, that the bulk of the resins and many other polymers matrices used for composite activities across the globe are produced from non renewable Petrochemicals substances like Xylene, ethylene, propylene; benzene and vinyl chloride by polymerization processes. In addition, some health related illnesses such as respiratory tract infections and some skin infections have been reported to be associated with production process of these synthetic resins. In addition to the above challenges of synthetic resins, it was reported by [6] that the bulk of synthetic resins used for wide range of engineering activities in Nigeria are imported materials. Despite the adverse effects of the importations on our economy, the materials are not readily available for use and are only found in few specialize places in some of the commercial cities. Concerted efforts have been intensified by researchers across the globe to mitigate the challenges posse by continuous and linear use of synthetic resins (polymer matrices) for composite activities. This lead to two major processes by which vegetable or plant oil can be modified or functionalized to produce bioresin. These are epoxidation and acrylation chemical reactions, [6]. Epoxidation represents one of the most important fundamental reactions involving the triglyceride and specifically involves functionalizing the double bonds (C=C) between the carbon atoms. Epoxidation of plant or vegetable oils leads to the material that is known as epoxidized vegetable oil (EVO). Epoxidized oil serves as raw material for synthesis of many industrial chemicals including bioresins, polymers, lubricants, plasticizers, etc. [7]. According to [8], epoxidized vegetable oil (EVO) polymers by themselves may be suitable as a polymeric matrix for composites if blended with synthetic epoxy resin. Further modifications can be made on the chemical structure to modify functionalities. One such modification involves acrylation of the epoxides formed during epoxidation reaction. Acrylation is a chemical reaction where epoxidized vegetable oil structure is modified for further functionalities. In this process, epoxy functional triglyceride of the oil is reacted with acrylic acid to incorporate acrylate chemical groups onto the triglyceride thereby attaching vinyl functionalities to its structure. Acrylation reaction helps to convert the unreacted epoxides in the oil to impart further functionalization to the triglyceride thereby improving the polymer performance. After this modification, a polymer in the form of an acrylated epoxidized vegetable oil (AEVO) is obtained. The conversion of EVO to AEVO allows, lower curing temperatures, shorter curing times and improved material properties, [9] and [10]. The aim of this work is to produce and analyze renewable resin from epoxidized mango kernel oil (EMKO) for composite application. Available and sustainable resin from mango kernel oil will serve as alternative resin for composite manufacturing activities. This will go a long way in cushioning the adverse effects of using fossil fuel as raw material for synthetic resins productions and consequently mitigates some of the challenges associated with petrochemical resins.
  • 3. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 7 II. Materials and Methods 2.1 Materials Table 1: List of materials, chemical compounds, devices and apparatus. S/No. Raw material and Chemical compounds Devices/Apparatus 1 Epoxidized mango kernel oil Buck infrared spectrophotometer (model 530) 2 Acrylic acid Digital weighing machine (LA 164. B. Brain) 3 Hydroquinone Measuring cylinder 4 Toluene Griffin temperature and adjustable oven 5 Distilled water Conical flask 6 Anhydrous sodium sulfate U-tube Viscometer 7 Pipette 8 Burette 9 prolab efflux viscometer, 10 stop watch 11 2-neckround bottom flask 12 Hot plate equipped with magnetic stirrer 13 Magnetic bit 14 Tripod stand 15 Thermometer 16 Graduated dropping funnel 17 Circulating water bath 18 Separating funnel 2.2 Methods 2.2.1 Production of acrylated epoxidized mango kernel oil (AEMKO) Acrylated epoxidized mango kernel oil (AEMKO) was prepared according to ASTM standard reported by [11]. In this study, epoxidized mango kernel oil (EMKO) was reacted with Acrylic acid in a 250 mL round- bottom flask equipped with a magnetic stirrer and a reflux condenser. Hydroquinone which was used as a free radical inhibitor was added to the contents in the flask. The molar ratio of EMKO: acrylic acid was 1:10. The flask was heated to 90°C until the light yellow colour changed to milky colour which indicated complete reaction. The mixture was cooled to room temperature and diluted with toluene before purifying by washing with distilled water. The final product was dehydrated with anhydrous sodium sulfate and the solvent was evaporated using an evaporator. The above procedure was repeated to achieve the quantity of the bioresin targeted. Plate 1 showed the sample of epoxidized mango kernel oil (EMKO) that was reacted with acrylic acid to produce the acrylated epoxidized oil. Plate 2 showed the setup for acrylation reaction in the laboratory while plate 3 showed the acrylated oil (bioresin) produced.
  • 4. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 8 Epoxidized oil + Acrylic acid Acrylated epoxidized oil ……… (Eq. 1) O O O O-C-CH2=CH2 CH2-O-C-CH-CH-R + CH2=CH-CO2H CH2-O-C-C Plate 1: Epoxidized mango kernel oil (EMKO) Plate 2. Setup for Acrylation reaction Plate 3. Bioresin produced from EMKO 2.2.2 Production of Fourier transforms infrared (FTIR) Spectrum In this study Buck infrared spectrophotometer (model 530) was used to produce the FTIR spectra of the epoxidized and acrylated epoxidized oils respectively. The 4000–500 cm-1 infrared spectral regions of the oils are shown in Figures 2 and 3. From the recognized peaks, heights and wave number on the spectra of each oil sample, the functional groups corresponding to each wave number were identified according to [12] and John [13] interpretation charts. The results are found in tables 2 and 3. 2.2.3 Determination of Viscosities of the bioresin The Viscosity of the acrylated epoxidized oil and the acrylated epoxidized oil mixed with 33% by weight of styrene were determined at temperature of 25 °C according to ASTM method that involved the use of Brookfield viscometer apparatus as described by [14]. The result of the viscosity measurements are found in table 4. 2.2.4 Determination of the density of the bioresin The density of the bioresin was determined at (27o C) according to ASTM standard obtained from [15]. The result is found in table 4. OH CH - R
  • 5. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 9 2.2.5 Determination of Glass transition temperature of the bioresin The glass transition temperature of the fully cured bioresin produced was determined using ASTM method that involved the use of Differential Mechanical Thermal Analysis (DMTA) described by [ ]. The result is found in table 4. 2.2.6 Economic Analysis of bioresin from mango kernel oil The economic analysis of the bioresin is centered on the costs implications of the various activities involved right from the Collection and processing of mango seeds for oil extraction up till the production of the bioresin via acrylation method. i. Collection and processing of mango seeds for oil extraction Mango seeds (house the kernels containing oil) are waste materials that are readily available, affordable and sustainable in Nigeria and many other countries. It virtually cost nothing to gather the seeds during the harvesting season after they are thrown away by the farmers, users and the consumers. Processing of the kernels for oil extraction virtually also cost nothing. The labour and over head costs associated with the collection of the seeds were estimated as N200. ii. Extraction of oil from the seed kernels. The solvent used for the oil extraction was N- hexane and it costs N18, 000 for 4 litres used to extract 3.2 litres of the oil. The labour and over head costs were estimated as N1, 000 and N500 respectively. iii. Conversation of the raw oil to epoxidized oil. The cost of conversion of 3.2 litres of the raw oil to epoxidized oil was estimated as N5, 000. This covers the materials (chemicals) estimated as N3, 500 and labour and over costs estimated as N1, 500. iv. Conversation of epoxidized oil to Resin The cost of conversion of 3.2 litres of the epoxidized oil to acrylated oil and later to resin was estimated as N14, 000. This covers the materials (chemicals) estimated as N12, 000 while the labour and over head costs were estimated as N2, 000. Treatment of acrylated oil to resin involves addition of Styrene to the acrylated oil to reduce the viscosity to the level suitable for composite processing. The viscosity reduction leads to increase volume from 3.2 to 4.6 litres. The chemical, labour and over head costs were estimated as N1000, N500 and N300 respectively. The summary of total expenses incurred in the production of the bioresin is shown in table 5. III. Results The results of the Spectra of EMKO and AEMKO are found on figures 1 and 2 while tables 2 and 3 showed the results of the interpretations of the FTIR spectra of the figures. Table 4 showed the result of the viscosity measurements of AEMKO and treated AEMKO with 33% styrene, density and the glass transition temperature of the bioresin. Table 5 showed the summary of the determined properties of the resin and comparism with ASTM standards.
  • 6. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 10 Figure 1. Spectrum of epoxidized mango kernel oil (EMKO)
  • 7. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 11 Figure 2. Spectrum of acrylated epoxidized mango kernel oil (AMKO) Table 2. Peak identification of FTIR spectra of Epoxidized mango kernel oil (EMKO) and interpretations Frequency range (cm-1 ) Wave number (cm-1 ) Peak Height Percent transmittance (%) Peak Assignment (Bond) 730 – 665 728 79.156 C = C 1124 – 1089 1115 75.304 C – O 1200 – 1020 1175 64.812 C - OH 1250 – 1050 1242 77.047 C – O - C 1600 = 1400 1421 87.587 C = C 1600 – 1400 1465 79.321 C = C 1745 -1715 1741 63.687 C= O 2950 - 2840 2854 64.419 C - H 2950 - 2840 2925 54.720 C - H
  • 8. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 12 Table 3. Peak identification of FTIR spectra of Acrylated mango kernel oil (AEMKO) and interpretations Frequency range (cm-1 ) Wave number (cm-1 ) Peak Height Percent transmittance (%) Peak Assignment (Bond) 730 – 665 698 81.088 C = C 840 – 790 736 74.413 C = C 840 – 790 821 44.600 C = C 840 - 915 866 60.797 C = C 915 – 985 929 58.537 C = C 915 – 985 985 44.510 C = C 1050 – 1048 1048 68.340 CO – O = CO 1085 – 1050 1063 70.688 C = O 1250 -1050 1242 41.731 C – O - C 1480 – 1440 1436 54.859 CH2 1680 – 1600 1618 62.151 C = C 1680 – 1600 1637 56.393 C – C 1700 – 1500 1700 20.619 C = O 2830 – 2695 2661 85.055 C – H 2950 - 2695 2933 75.935 C - H Table 4: Summary of determined properties of the bioresin S/NO. Parameters Determined value 1 Iodine value (IV) of renewable oil suitable for bioresin synthesis 60.7mg iodine/100g oil 2 Degree of Epoxidation (DOE) 69.4% 3 Degree of Acrylation (DOA) 46% 4 Viscosity 387Cp 5 Density 1.2g/cm3 6 Glass transition temperature (Tg) 95o C
  • 9. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 13 Table 5: Summary of total expenses incurred in the production of bioresin from mango kernel oil. S/No. Criteria Material cost (N) Labour cost (N) Over head cost (N) 1 Collection and processing of mango seeds for oil extraction -------- …… 200 2 Extraction of oil from the seed kernels. 18,000 1,000 500 3 Conversation of the raw oil to epoxidized oil 3,500 1,000 500 4 Conversation of the epoxidized oil to Resin 12,000 1,500 500 5 Treatment of acrylated epoxidized oil with 33% styrene so as to reduce viscosity to acceptable level 1,000 500 300 Total 34, 500 4,000 2, 000 The cost of one (1) litre of the resin = 𝑀𝑎𝑡𝑒𝑟𝑖𝑎𝑙 𝑐𝑜𝑠𝑡 +𝐿𝑎𝑏𝑜𝑢𝑟 𝑐𝑜𝑠𝑡 +𝑂𝑣𝑒𝑟 ℎ𝑒𝑎𝑑 𝑐𝑜𝑠𝑡 4.6 = 𝑁40,500 4.6 = N8, 804.35 The high cost of production is due to the high costs of chemicals and the labours involved. At commercial level, these components of costs would definitely reduce to the level compatible with synthetic (polyester) resin (N2, 500 per litre) currently sold by some markers in Nigeria. IV. Discussion Epoxidized mango kernel oil (EMKO) which serves as a raw material for bioresin production by acrylation method was previously produced with 69.4% DOE as explained by [6]. The acrylation reaction conducted on EMKO in this study is a further modification on the chemical structure where the epoxy functional triglyceride of the epoxidized oil was made to react with acrylic acid so as incorporates acrylate chemical groups onto the triglyceride to yield vinyl functionalities structure. Although epoxidized vegetable oil (EVO) may be suitable as a polymeric matrix for composites applications if blended with synthetic epoxies, but acrylation of the epoxidized oil according to According to [7] and [8], gives better properties (such as lower curing temperatures, shorter curing times and improved properties) on the resin. According to [16], vinylesters are processed the same way as unsaturated polyesters despite the difference in the chemical structure. The crosslinkng reaction of vinylester is identical to the free-radical crosslinkng of unsaturated polyesters and the same crosslinkng agents, initiators, acceleretors and inhibitors used for polyesters are also used for vinylesters. This is underscores the reason why acrylation reaction is carried out on the epoxidized oil. The FTIR spectrum of the epoxidized and the acrylated oils respectively were determined using Buck infrared spectrophotometer (model 530). The FTIR spectrum were used to monitor the epoxidation and acrylation reactions by analyzing the peaks pertinent to C=C consumption and epoxide and acrylate formation. Figure 1 presents the spectra of EMKO while figure 2 shows the spectra of AEMKO. On each of the spectrum, significant areas at specific wave numbers, peak heights and the possible functional groups were documented as shown in tables 2 and 3. The shape of the plot (wave number against transmittance) of the EMKO is different from that of the AEMKO which indicated that some transformations took place during the reaction of the EMKO with acrylic acid. Considering the spectrum of the EMKO (i.e. figure 1), there are many peaks where the carbon double bond functional groups that were not completely reacted during the epoxidation reaction resurfaced (i.e. wave number 728,1421, 1465 cm-1 ). However, peak of interest occurs at 1242 cm-1 which
  • 10. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 14 reflects epoxidized functional group. The carbon double and the epoxidized functional groups were responsible for acrylation reaction yield. Similarly Figure 2 presents the FTIR spectra associated with the acrylation reaction of the epoxidized mango kernel oil (EMKO). The spectrum shows different functional groups including the carbon double that could not react completely during the acrylation process. However, the peak of interest occurs at wave number1241 cm-1 and is associated with the transformation of epoxy group to acrylate group, [17] and [18]. Before the acrylation reaction, the peak height was 77.047% on the epoxidized oil spectrum and after the acrylation reaction, the peak reduced to 41.731%. This indicated 35.32% transformation and gave rise to 46% DOA on the basis of 100% peak height. Other peaks of interest occur at wave number 2005 and 2085 cm-.1 . According to [19], these peaks and others associated with carbon double are attributed to the formation of acrylic functional groups in the acrylated epoxidized oil. Comparing the peak height of wave number 2005 cm-.1 on epoxidized oil and acrylated oil spectra, only 30.8% transformation took place. This gave rise to 40% DOA. The low transformation figures may be unconnected with effective management of the acrylation chemical reactions and the low unsaturated nature of the mango kernel oil as indicated by the iodine value (60.7 mg iodine/100 g oil) determined and explained by [20]. The viscosity of resin generally has to be such that can easily be used for production without any stress. The viscosity of AEMKO without treatment with styrene was 1632 cP. This figure was too high for composite processing techniques. Going by report of [7], there is need to decrease such very high viscosity by adding about 33% by weight of styrene to the AEMKO in order to improve processability for manufacturing composite parts by traditional composite processing techniques. The 33% by weight of styrene added to the AEMKO decreased the viscosity to 387 cP. Apart from decrease in viscosity of AEMKO, the addition of styrene also increases the volume of the bioresin from 3.2 to 4.6 litres. The density of resin is one of the physical properties that enable one to know the heaviness (dense nature) of the resin. It gives idea about the mass of the resin with respect to the volume (space) occupied. The density of the final product determined was 1.2g/cm3 . The glass transition temperature (Tg) is a thermodynamic property that gives idea about the working temperature of the fully cured resin. The (Tg) was determined to be 95o C. This means that at 95o C, the polymer begins to turns from a hard and brittle material to a ductile material. Production cost analysis of the bioresin was conducted and gave one litre of it to be N8, 804.35. The high cost of production is due to the high costs of chemicals and the labours involved at my local level in Nigeria. V. Conclusion The following conclusions were made based on the outcome of the work: 1. The acrylation chemical reaction was conducted using acrylic acid. The degree of acrylation (DOA) estimated from FTIR spectrum of the epoxidized oil and the bioresin analysis was 46%. Although the value is low, it however meets the ASTM standard of 33 – 94%. The low value of the DOA is a reflection of the low level of unsaturation of MKO as dictated by its iodine value (60.7g iodine/100g of oil) and of course effective management and control of acrylation process. 2. The analysis of the infrared (IR) spectrum of the epoxidized oil and the bioresin also indicated that the oils contain other compounds and bonds apart from the C=C that form the bases of unsaturation level for the conversion of the raw oil into epoxidized oil and the epoxy functional groups that provides the plate form for conversion into acrylate groups of the bioresin. These functional groups contributed in the overall reaction in the epoxidation and acrylation processes respectively. 3. The dynamic viscosity (1632 cP) of the AEMKO produced was too high for composite production activities. This necessitated the addition of 33% by weight of styrene to the AEMKO thereby decreasing the viscosity to 387 cP which is within the ASTM standard range of viscosity (100 to 500 cP at 20o C) of resin for composite processing. In addition to the decrease in viscosity, the 33% by weight of styrene mixed with AEMKO also increases the volume of the resin from 3.2 to 4.6 litres.
  • 11. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 15 4. One of the physical properties of the resin that enable one to know the heaviness (dense nature) of the resin, density was determined to be 1.2g/cm3 and falls within the ASTM standard range of 1.0 – 1.5g/cm3 . The glass transition temperature (Tg) which is a thermodynamic property that gives idea about the working temperature of the fully cured resin was also determined to be 95o C. This value meets the ASTM standard range of 80o C – 110o C for bioresins and 80o C – 280o C for synthetic resins. 5. Economic analysis of the bioresin estimated one litre of the resin to be N8, 804.35. The high cost of production is due to the high costs of chemicals and the labours involved. At commercial level, these components of costs would definitely reduce to the level compatible with synthetic (polyester) resin (N2, 500 per litre) currently sold by some markers. However, when the bioresin produced is compared with those from soya bean or palm fruit oils or other eatable oils developed by some researchers, the bioresin from mango kernel oil has an added advantage in that the oil is not eatable and more so the source (mango seed kernel) is a waste material that is readily available, affordable and sustainable in Nigeria and many other countries. References [1.] Sadiq, A. S. Bello, A. A. & Tokan, A, Shift towards renewable oil for resin production for fibre reinforced composite materials in Nigeria. Proceeding of the 29th AGM & International Conference of the Nigerian Institution for Mechanical Engineers (NIMechE). Uyo in Akwa Ibom state, Nigeria. 2016. [2.] Astron. B.T. Manufacturing of polymer composites 3rd edition (Chapman and Hall Publishing Company, London, 1997) [3.] Strong, A..B. Fundamentals of composites manufacturing: materials, method and Applications. 2nd edition (SME Publishing Ltd. Dearbarn, MI U.S.A, 1999) [4.] British Plastic Federation in Oil consumption. http://www.bpf.co.uk/Press/Oil Consumption.aspx (Accessed 26 March 2011) [5.] Organisation for Economic Co-operation and Development (OECD) in Emission scenario document on plastic additives. Series on Emission Scenario documents, No. 3. Paris Environmental directorate and Environmental Health and Safety Publications, 2004. [6.] Sadiq, A. S. Bello, A. A. Tokan A. and Abdulsalam, S. Production and analysis of epoxidized oil from Rosigold mango (Mangifera indica) kernel oil for bioresin synthesis. Accepted for publication in Journal of the Nigerian Institution of Mechanical Engineers. 2018. [7.] Nathan, W. M. Development of hemp oil based bioresins for biocomposites. A Dissertation submitted for the award of Doctor of philosophy. centre of excellence in engineered fibre composites. Faculty of engineering and surveying University of Queensland, Australia. 2014. [8.] Wool, R. P, Polymers and Composite Resins from Plant Oils’. ‘Biobased Polymers and Composites, 2005. [9.] Reena, V., Gajanan C., Nitin , R., Ganesh, S. & Nilesh, D. Synthesis of Biocomposites from Natural Oils- a Review. International Conference on Environmental, Biomedical and Biotechnology. IPCBEE vol.41 IACSIT Press, Singapore. 2012. [10.] Firdous, H, & Madhu, B. Synthesis and characterization of acrylated epoxidized soybean oil for uv cured coatings. Harcourt Butler Technological Institute (HBTI) Kanpur- 208002 (UP) India, 2011. [11.] Nursyazana, B. T. & Nazri, M. D. Production of bio resin from Palm oil. Unpulish thesis submitted in partial fulfilment of the requirements for the award of the degree of Bachelor of Chemical Engineering Faculty of Chemical & Natural Resources Engineering. Malaysia Pahang, 2014. [12.] Barbara Atuart, John Infrared Spectroscopy: Fundamentals and Applications 2nd edition (Wiley & Sons, Ltd., Chichester, 2004) [13.] John Coates Interpretation of Infrared Spectra, A Practical Approach in Encyclopedia of Analytical Chemistry 1st edition (John Wiley & Sons Ltd, Chichester, 200).
  • 12. International Journal of Modern Research in Engineering and Technology (IJMRET) www.ijmret.org Volume 3 Issue 12 ǁ December 2018. w w w . i j m r e t . o r g I S S N : 2 4 5 6 - 5 6 2 8 Page 16 [14.] Ejilah, I. R. Performance, emission and wear characteristics of single-cylinder gasoline engine running on seed oil-blended lubricants. Unpublished PhD Thesis, Mechanical Engineering Department, Abubakar Tafawa Balewa University, Bauchi, Nigeria, 2010. [15.] Kakani S. L. and Amit Kakani, Material science 1st edition (New age international publishers, Bangalore New Delhi India, 2008) [16.] La Scala, J.J. The effects of triglyceride structure on the properties of plant oil-based resins. PhD thesis, University of Delaware, 2002. [17.] Cooney, T. 'Epoxidized resins from natural renewable resources', USQ Honours research project thesis , 2009. [18.] Wool, R.P & Sun, X.. Bio-based polymers and composites. 1st edition, (Oxford Academic, 2005) [19.] Fu, L, Yang, L, Dai, C, Zhao, C & Ma, L, 'Thermal and mechanical properties of acrylated epoxidized-soybean oil-based thermosets', Journal of Applied Polymer Science, vol. 117, no. 4, 2010, pp. 2220-5. [20.] Sadiq, A. S. Ejilah I. R. and Aroke U. O. Extraction and Assessment of Physicochemical properties of Rosigold Mango (Mangifera indica) kernel oil for bioresin production. Arid Zone Journal of Engineering, Technology and Environment. Vol. 13, no. 5, 2017, 643 – 654. www.azojete.com.ng.