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...(approximately 5 percent) of a diene—usually ethylidene norbornene or 1,4-hexadiene. Both copolymers are prepared in solution using Ziegler-Natta catalysts. The former are known as EPM ( ethylene-propylene monomer) and the latter as EPDM (ethylene-propylene-diene monomer). The copolymers contain approximately 60 percent by weight ethylene. A pronounced advantage of EPDM is that the...
Four common elastomers are cis-polyisoprene (natural rubber, NR), cis-polybutadiene (butadiene rubber, BR), styrene-butadiene rubber (SBR), and ethylene-propylene monomer (EPM). SBR is a mixed polymer, or copolymer, consisting of two different monomer units, styrene and butadiene, arranged randomly along the molecular chain. (The structure of SBR is illustrated in the figure.) EPM...
...with two pairs of carbon atoms joined by a double bond. Ethylene and propylene are olefins, hydrocarbons in which there is only one carbon-carbon double bond.) The former is known as EPM ( ethylene-propylene monomer) and the latter as EPDM (ethylene-propylene-diene monomer). The copolymers contain approximately 60 percent by weight ethylene.
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