Ethylene glycol dimethylacrylate is a diester formed by condensation of two equivalents of methacrylic acid and one equivalent of ethylene glycol. EGDMA can be used in free radical copolymer crosslinking reactions

1. Ethelene
Methacrylate
Rubber
Guided by :- Prof.
Bhakti patel

2. TEAM MEMBERS :-
Zadafiya Meet 190280126039
Savaliya jenish 190280126029
Talaviya Pratik 190280126035
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3. INDEX
1. Synthesis Reaction
2. Chemistry
3. Manufacturing process with flow
diagram
4. Compounding
5. Processing
6. Blend with other rubber
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4. Ethelene
Methacrylate
Rubber
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1 2 3

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 AEM rubbers were
introduced by Du Pont in
1975 under the trade
name of Vamac. The
rubbers are terpolymers
of ethylene, methyl
acrylate and a cure site
monomer of undisclosed
composition and may be
represented as
 Du Pont remains the only
supplier and production
is estimated to be in the
range 1000-2000 tpa.
 Whereas acrylic (ACM)
rubbers tend to be used
for specifications where
nitrile rubbers fail to
meet the temperature
requirements, the
ethylene-methyl
acrylate rubbers are
best considered for use
where a chloroprene
rubber fails to meet such
a requirement.
chemistry

6. CURING SYSTEM :-
Curing system consists of a combination of hexamethylene diamine carbamate
(marketed as Diak No. 1) and a guanidine.
For low compression set it is common to use 1-5 pphr of the carbamate with 4 pphr of
DOTG, whereas for flex resistance 1-25 pphr of the carbamate is recommended with 4
phr of DPG.
 For very thick mouldings the guanidine is replaced by a proprietary secondary amine
(Armeen 2C).
 Peroxide cures may be used for cable applications where fast cures under continuous
pressurized vulcanization are required but they are not recommended for moulded
articles where poor hot strength and mould sticking may cause difficulties.
Somewhat unusually, compression set resistance is poor when peroxide cures are used.
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COMPAUNDING

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 Reinforceing filler:-
Carbon black is the preferred filler, whilst mineral fillers must be selected with
care, fumed silicas having the least effect on ageing Aluminium hydroxide is a
useful flame-retarding filler but its use has an adverse effect on heat ageing
and also may over a period of time form ionic cross-links with the polymer.
Example:- Carbon black (SRF), Aluminium hydroxide, Mineral fillers
Plasticiser:-
The choice of plasticizer if required must also be made with care.
A normal ester plasticizer, although depressing cold-flex temperatures to
about 50°C, is volatile at high temperatures and reduces upper service
temperatures to about 125-135°C.
Polyesters have much lower volatility but have little effect on low-
temperature properties.

8. Other additives:-
Polyesters have much lower volatility but have
little effect on low-temperature properties. Most
commonly used are proprietary mixed
ether/esters such as Thiokol TP759 and Nycoflex
ADB-30, which may be used in the range -45 to
+165°C. Example:- Thiokol TP759, Nycoflex ADB-
30
Antioxidants:- They are beneficial for curing
Example:- Diphenylamine Realising agent:- To
prevent sticking to processing machinery,
release agents should be used.Example:- Stearic
acid
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9. Transition
headline
Let’s start with the first set of slides
Processing:-
• • The low viscosity and green strength are the governing factors controlling processing
operations.
• • Mixing should be carried out at temperatures as low as possible with release agents
added at the commencement of mill mixing and upside-down techniques being used in
internal mixing.
• • In extrusion the main problem is the low collapse resistance. This may be reduced by
use of high-green-strength grade reinforcing fillers (silica or FEF) and minimum levels of
plasticizer.
• The major problems in moulding are mould sticking, minimized by the use of hard
chrome-plated moulds cleaned between cycles, and a trapping due to the lowesity.
• • Post curing, typically for 4h at 175 C. improves tensile strength. modulus and resistance
to compression set.
• and stabilizes physical properties before commencement of evaluations of ageing
behaviour

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 Ethylene methyl
acrylate and
poly(dimethylsilo
xane)are
demonstrated to
be miscible
 The miscibility
result in a single
and composition
dependent glass
transition
temperature.
 IR spectra of the
blends provide
direct evidence
of chemical
reaction between
EMA and PDMS
rubber.
EMA Rubber
Blend with other
Rubbers.

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