Ethylene-propylene-ethylidene norbomene terpolymer

Ethylene-propylene-ENB terpolymer. See Ethylene-propylene-ethylidene norbomene Ethylene-propylene-ethylidene norbomene CAS 25038-36-2... 

Orientations in elongated mbbers are sometimes regular to the extent that there is local crystallization of individual chain segments (e.g., in natural rubber). X-ray diffraction patterns of such samples are very similar to those obtained from stretched fibers. The following synthetic polymers are of technical relevance as mbbers poly(acrylic ester)s, polybutadienes, polyisoprenes, polychloroprenes, butadiene/styrene copolymers, styrene/butadiene/styrene tri-block-copolymers (also hydrogenated), butadiene/acrylonitrile copolymers (also hydrogenated), ethylene/propylene co- and terpolymers (with non-conjugated dienes (e.g., ethylidene norbomene)), ethylene/vinyl acetate copolymers, ethyl-ene/methacrylic acid copolymers (ionomers), polyisobutylene (and copolymers with isoprene), chlorinated polyethylenes, chlorosulfonated polyethylenes, polyurethanes, silicones, poly(fluoro alkylene)s, poly(alkylene sulfide)s. 

Copolymerization of ethylene and propylene produces an elastomeric polymer that is virtually inert because of the absence of carbon-carbon double bonds (EPM). Such polymers thus tend to be crossUnked with peroxides or by radiation. To improve the reactivity of ethylene-propylene copolymers, 1-10% of a third monomer can be added to give a terpolymer or ethylene-propylene-diene monomer (EPDM). The primary diene monomers used in EPDM are 1,4-hexadiene, dicyclopentadiene, and ethyUdene norbomene. Introduction of an unsaturated monomer such as ethylidene norbomene will enable use of sulfur-based crosslinking systems. 

The mechanical mixture of oxidant and polymer is also an interesting method to incorporate the oxidant in the polymer matrix. Blends of polypyrrole and EPDM rubber (a terpolymer of ethylene, propylene and ethylidene norbomene) were obtained using an EPDM matrix impregnated with CUCI2 by calendering [31]. 

There are many other commercial examples of polymer blends. Polycarbonate can be blended with an acrylonitrile-butadiene-styrene terpolymer to give a PC-ABS blend. Polypropylene impact can be improved by the addition of ethylene-propylene copolymers, which are sometimes called ethylene-propylene-rubber (EPR). Ethylene, propylene, and a diene monomer (EPDM), such as ethylidene norbomene, is also used to impart impact and flexibiUty to polypropylene. 

Macromonomers of polymeric dicyclopentadiene and polymeric ethylidene norbomene have been prepared and then terpolymerized with ethylene and propylene. This terpolymer exhibits compatibi-lization of ethylene-propylene rubber and butyl rubber (41). 

As a consequence of the situation depicted above, terpolymers based on ethylene and propylene are expected to contain different amounts of brandling33 or gel34, even when they contain only single olefinic unsaturation. It has been calculated34 that in the case of terpolymers based on 5-ethylidene-2-norbomene (ENB) the gel point is passed at about 0.2 wt % of ENB. 

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