Polymer from polydiene, hydrogenated

There is one additional group of polymers which is derived from this chemistry, the hydrogenated polydienes. Hydrogenated polyisoprenes [41] are chemically equivalent to an alternating copolymer of ethylene and propylene when polymerized in a 1,4 configuration and would thus be expected to exhibit behaviour which is very similar to that of OCPs. Similar characteristics can be achieved with polybutadiene... 

POLYMERS FROM HYDROGENATED POLYDIENES PREPARED WITH NEODYMIUM CATALYSTS... 

A new class of polymers with repeating cycloketonic units along their chain can be prepared by reaction of polydiene containing adjacent structural units derived from 1,4-d.s polymerization of conjugated dienes with carbon monoxide. This is best achieved in the presence of a free radical initiator and, preferably, a compound capable of acting as a hydrogen donor [36]. Infrared studies clearly indicate that the carbonyl moiety is incorporated in the forms of cyclopentanones and cyclohexanones. The content of carbonyl units as well as the ratio of cyclopentanones/cyclohexanones depends strongly on the experimental conditions. The simple mechanistic Scheme 5 for the chain modification of the polymer is not adequate to explain such a behavior. 

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