The document discusses several methods for characterizing crystallinity in polymers:
- Differential scanning calorimetry (DSC) measures heat of fusion and compares to literature values to determine percentage crystallinity. Issues include needing 100% crystalline literature values and thermal history effects.
- Dilatometry measures changes in specific volume with temperature to determine crystallinity, but requires knowing the pure crystalline specific volume.
- Wide-angle X-ray scattering/diffraction can determine precise crystal structure but data analysis is difficult. It provides information about orientation and perfection of crystallites.
- Polarized optical microscopy allows quickly seeing if a polymer is crystalline but other factors can cause birefringence and it is hard to quantify crystallinity
This presentation describes the technological advancement of today's engineering field.These explains the application of chemistry in adhesives bucky balls and many more nano particles.
This also covers the topic of liquid crystals.
This is a powerpoint presentation that is about one of the Senior High School Core Subject: Earth and Life Science. It is composed of the definition, characteristics, history and processes involved in basic crystallography.
This presentation describes the technological advancement of today's engineering field.These explains the application of chemistry in adhesives bucky balls and many more nano particles.
This also covers the topic of liquid crystals.
This is a powerpoint presentation that is about one of the Senior High School Core Subject: Earth and Life Science. It is composed of the definition, characteristics, history and processes involved in basic crystallography.
PerkinElmer: Nano-Composites Characterization by Differential Scanning Calori...PerkinElmer, Inc.
Nanocomposites are usually comprised of organic polymer composites with inorganic nanomaterial fillers or building blocks. This combination increases the physical properties of the final nanocomposite product. Rigidity, thermal stability, dielectric strength, ductility, and elastic limits are expanded due to the special properties that nanoscale objects have compared to the traditional bulk fillers and bulk fibers. The uniqueness of nanoscale materials is the large surface area to weight ratio. This single nano characteristic leads to a dramatic increase in the interfacial area compared to traditional filler.
Thermal analytical techniques that are used to characterize nanocomposite formulations during development, processing, and final acceptance testing are: Differential Scanning Calorimetry (DSC, HyperDSCTM), Thermogravimetry (TGA), Dynamic Mechanical Analysis (DMA), and the hyphenated technique Thermogravimetry-Gas Chromatography-Mass Spectrometry (TGA-GC-MS), are used to measure nanocomposites. These measurements help ensure that the nanocomposite manufacturing process is stable, reproducible, and reliable. This poster concentrates on the formulation and end product validation through Differential Scanning Calorimetry (HyperDSCTM) characterization.
X-ray diffraction (XRD) is a versatile non-destructive analytical technique used to analyze physical properties such as phase composition, crystal structure and orientation of powder, solid and liquid samples. Many materials are made up of tiny crystallites. The chemical composition and structural type of these crystals is called their 'phase'. Materials can be single phase or multiphase mixtures and may contain crystalline and non-crystalline components. In an X-ray diffractometer, different crystalline phases give different diffraction patterns. Phase identification can be performed by comparing X-ray diffraction patterns obtained from unknown samples to patterns in reference databases.
principles:
X-Ray Diffraction is the result of constructive interference between X-rays and a crystalline sample. The wavelength of the X-rays used is of the same order of magnitude of the distance between the atoms in a crystalline lattice. This gives rise to a diffraction pattern that can be analysed in a number of ways, the most popular being applying the famous Bragg’s Law (nλ=2d sin θ) which is used in the measurement of crystals and their phases.
Applictions:
Many researchers, in industrial as well as in scientific laboratories, rely on X-ray diffraction (XRD) as a tool to develop new materials or to improve production efficiency. Innovations in X-ray diffraction closely follow the research on new materials, such as in semiconductor technologies or pharmaceutical investigations. Industrial research is directed toward the ever-increasing speed and efficiency of production processes. Fully automated X-ray diffraction analyses in mining and building materials production sites result in more cost-effective solutions for production control.
The main uses of X-ray diffraction are:
Qualitative and quantitative phase analysis of pure substances and mixtures. The most common method for phase analysis is often called 'X-ray powder diffraction' (XRPD).
Optical and Dielectric Studies on Semiorganic Nonlinear Optical Crystal by So...ijrap
The field of nonlinear optics became practically a reality after the invention of laser. High performance electro-optic switching elements for telecommunication and optical information processing are based on materials with high nonlinear optical (NLO) properties. Single crystals of nonlinear optical material Llysine sulphate (LLS) are grown by slow evaporation technique. The crystal structure and lattice parameters are determined for the grown crystal by single X-ray diffraction studies. The wide transparency range of the crystals in the visible region of the electromagnetic spectrum is identified by the UV-Vis-NIR technique. The mechanical property of the grown crystal is determined by Vicker’s microhardness test. It is observed from the microhardness studies of the grown crystals that the hardness increases with increase in load. Meyer’s index n is calculated which proves that the material belongs to soft material category. The dielectric constant and dielectric loss are calculated by varying the frequencies at room temperature. The emission of green light on passing the Nd: YAG laser confirms the second harmonic generation (SHG) property of the crystals .The SHG efficiency of the crystals are found to be better than that of Potassium Di hydrogen Phosphate (KDP)
Lecture notes on Structure and Properties of Engineering Polymers
Course Objectives:
The main objective is to introduce polymers as an engineering material and emphasize the basic concepts of their nature, production and properties. Polymers are introduced at three levels; namely, the molecular level, the micro level, and macro-level. Through knowledge of all three levels, student can understand and predict the properties of various polymers and their performance in different products. The course also aims at introducing the students to the principles of polymer processing techniques and considerations of design using engineering polymers.
Growth, Structure and Physical Properties of Tetraaqua Bismaleatocobalt (II) ...IOSR Journals
Tetraaqua bismaleatocobalt(II) crystals are grown by the controlled ionic diffusion in hydrosilica gel. The functional groups present in the crystal are identified using FTIR spectrum. The compound crystallizes in the triclinic system with space group P-1. The thermogravimetric studies revealed a three stage decomposition scheme. The polarization mechanism of the compound is explored using the dielectric measurements. The optical band gap of the material is found to be 2.4 eV from diffuse reflectance spectroscopy (DRS). The narrow magnetic hysteresis loop and structural considerations indicate the weak ferromagnetic behaviour of the material.
Study of Optical Property of Gel Grown Mercuric Iodate CrystalsIOSR Journals
Mercuric Iodate Crystals were grown by a simple gel technique using diffusion method. The optimum growth conditions were established for the growth of these crystals by changing various parameters such as pH of the gel solution, gel concentration, gel setting time, concentrations of reactants etc. The grown Mercuric Iodate crystals were spherical in shape. These crystals were opaque. The crystals were characterized using UV-VIS Specrophotometrry.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
2. Crystalline Structures
Single CrystalsSingle Crystals Polymer SpherulitesPolymer Spherulites
Sharmistha Datta & David J. W. Grant,Sharmistha Datta & David J. W. Grant, Nature Reviews Drug DiscoveryNature Reviews Drug Discovery 3,3,
42-57 (January 2004)42-57 (January 2004)
11. Kristal tunggal
2θ
Pada 20.6 °2θ, Hk Bragg
terpenuhi pada bidang
(100) & menghasilkan
sebuah puncak difraksi.
Bidang (110) seharusnya
menghasilkan difraksi pada 29.3
°2θ; tetapi tidak ‘properly aligned’.
Hanya acah latar yang terlihat.
Bidang (200) paralel dengan bidang
(100), sehingga menghasilkan
difraksi.
16. Tg & Tm
Differential thermal analyzerDifferential thermal analyzer
(DMA)(DMA)
Ref. such as AluminaRef. such as Alumina
At const. rate of T increaseAt const. rate of T increase
Endotherm: TmEndotherm: Tm
Small amount of sample, fastSmall amount of sample, fast
data and accuracydata and accuracy
Disadv: weak signal forDisadv: weak signal for
crystallinecrystalline
Heat change – DifferentialHeat change – Differential
scanning calorimetry (DSC)scanning calorimetry (DSC)
Keep temperature of sampleKeep temperature of sample
the same as that of Referencethe same as that of Reference
Monitor the current flowMonitor the current flow
17. Crystallinity by DSC
Example:Example:
Crystallinity ofCrystallinity of
PolyethylenePolyethylene
%100% ×
∆
∆
= °
f
obs
f
H
H
ityCrystallin
Q: “Where is my polymer in
this table?”
Table: Heats of fusion of 100%
crystalline polymers
18. Dilatometry
DilationDilation or change inor change in
specific volumespecific volume Computing crystallinityComputing crystallinity
Liquid of
known density
and thermal
expansion
coefficient
Polymer
∆V
ecrystallintotallyamorphous
ecrystallinpartiallyamorphous
vv
vv
C
−
−
=%
19. Dilatometry
Example: NylonExample: Nylon
How would you findHow would you find
the density (i.e.the density (i.e.
specific volume) ofspecific volume) of
this crystal given thethis crystal given the
size and shape?size and shape?
ecrystallintotallyamorphous
ecrystallinpartiallyamorphous
vv
vv
C
−
−
=%
Youyong Li and, William A. Goddard III
Macromolecules 2002 35 (22), 8440-8455
20. Wide angle x-ray
scattering/diffraction
X-rays: light withX-rays: light with
wavelength ~0.1-wavelength ~0.1-
10Å – the same10Å – the same
length scale aslength scale as
interatomicinteratomic
distancesdistances
Diffraction occursDiffraction occurs
only at specificonly at specific
angles, given by theangles, given by the
Bragg eqn.Bragg eqn.
θλ sin2dn =
23. What if it’s not a single crystal?
PolycrystallinePolycrystalline
samples looksamples look
different.different.
Example: HighlyExample: Highly
crystalline polymercrystalline polymer
with (mostly)with (mostly)
oriented crystallites.oriented crystallites.
Diffraction spots areDiffraction spots are
blurred into lines.blurred into lines.
24. What if it’s not a single crystal?
PolycrystallinePolycrystalline
samples looksamples look
different.different.
Example: HighlyExample: Highly
crystalline polymercrystalline polymer
with no orientationwith no orientation
of crystallites.of crystallites.
Diffraction spots areDiffraction spots are
blurred into fullblurred into full
circles.circles.
25. What if it’s not crystalline?
Diffraction circlesDiffraction circles
become much lessbecome much less
defined and blurred.defined and blurred.
Sharpness of circlesSharpness of circles
gives a clue togives a clue to
crystallinity.crystallinity.
26. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
semicrystalline poly(3-hydroxybuyrate)
27. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
semicrystalline poly(3-hydroxybuyrate)
note amorphous scattering region
28. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
Degree of crystallinity
Pattern consists of relatively sharp crystalline peaks +
amorphous scattering
Comparing intensities of the two ––> % crystallinity
29. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
Degree of crystallinity
Pattern consists of relatively sharp crystalline peaks +
amorphous scattering
Comparing intensities of the two ––> % crystallinity
Problems:
small crystallite size broadens peaks
extensive amounts of crystal imperfections
thermal motion
30. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
Degree of crystallinity
Pattern consists of relatively sharp crystalline peaks +
amorphous scattering
Comparing intensities of the two ––> % crystallinity
Methods for separation:
guess
measure 100% amorphous specimen
31. Polymers
(see Roe: Methods of X-ray and Neutron Scattering in Polymer Science (2000))
semicrystalline polydimethylpropiolactone
How was this photo taken?
Why does it look like this?
32. An estimate of crystallinity
The crystallinity can beThe crystallinity can be
estimated by comparingestimated by comparing
the areas of the peaksthe areas of the peaks
due to the amorphousdue to the amorphous
polymer with those ofpolymer with those of
the crystalline phase:the crystalline phase:
%C=A%C=Acrcr / (A/ (Acrcr + A+ Aamam))
K.A. Moly et al. / European Polymer Journal 41
(2005) 1410–1419;
34. Other methods: IR & NMR
Ying Zheng,, Merlin L. Bruening, and,
Gregory L. Baker
Macromolecules 2007 40 (23), 8212-
8219
35. Conclusion: A comparison
Method of
Analysis
Advantages Disadvantages
Differential
Scanning
Calorimetry
Fast, easy; You’re probably
going to use DSC anyway for Tg,
etc.
Need literature values of
heat of fusion for 100%
crystalline polymer for
comparison; thermal
history an issue.
Dilatometry A simple way to measure
polymer crystallinity based on
changes in volume.
Pure crystalline specific
volume must be known.
X-ray scattering Can determine precise crystal
structure.
Difficult to analyze data,
determine structure.
Polarized Optical
Microscopy
A quick way to see if a polymer
is crystalline.
Other factors (like strain
in the polymer) can cause
birefringence; difficult to
quantify.