Rubber, ethylene propylene, uses

Gueguen, V., Audouin, L. et ai. Lifetime prediction in the case of radiooxidative ageing of an ethylene-propylene-rubber used for electrical insulation. Polymer Degradation and Stability, 46 (1994), p. 113-122... 

US Environmental Protection Agency Ethylene-propylene diene terpolymer Expanded polyethylene Rubbers of ethylene-propylene monomer Ethylene-propylene rubber Expanded polystyrene Electrostatic-discharge dissipating... 

Chow WS, Abu Bakar A, Mohd Ishak ZA, Karger-Kocsis J, Ishiaku US. Effect of maleic anhydride-grafted ethylene-propylene rubber on the mechanical, rheological and morphological properties of organoclay reinforced polyamide 6/polypropylene nanocomposites. Eur Polym J 2005 41 687-96. 

Whilst the ASA materials are of European origin, the AES polymers have been developed in Japan and the US. The rubber used is an ethylene-propylene terpolymer rubber of the EPDM type (see Chapter 11) which has a small amount of a diene monomer in the polymerisation recipe. The residual double bonds that exist in the polymer are important in enabling grafting with styrene and acrylonitrile. The blends are claimed to exhibit very good weathering resistance but to be otherwise similar to ABS. 

Ethylene/propylene/ethylidenenorbomene rubbers US Patent 5106927, to Union Carbide, 1991. 

Onizawa M. Method for crossUnking of isoprene-isobutylene rubber, ethylene-propylene-diene rubber containing ethyli-denenorbomene as unsaturated component, or mixture thereof and crosslinked rubber product obtained by said method. US patent 6403713 2002. 

The failure of rubber parts used in domestic water applications has been reported flem several US states. The complaints involved swelling and cracking and are related to nitrile and ethylene-propylene copolymer type compoimds. The failure of the rabber parts coincides with the implementation and use of chloramines as a method of water purification. This investigation was designed to determine if EPDM composition variables influenced resistance to chloramines. Also evaluated were peroxide vs sulphur cure systems, the effect of antioxidants and whether practical compoimds can be developed for water systems. 5 refs. 

Both polyethers and polyesters may be used as polyols. For example, Du Pont use polytetrahydrofuran for Lycra whilst US Rubber originally used a polyester of molecular mass of about 2000 obtained by condensing adipic acid with a mixture of ethylene and propylene glycols. A polyether-based mixture was used for Vyrene 2 introduced in 1967. All the polyols have terminal hydroxyl groups. 

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