Abstract
AbstractBranching analyses in styrene–butadiene rubbers and polybutadiene rubbers have revealed large differences in branching between rubbers polymerized in different ways. The functionalities of several star‐branched solution‐polymerized styrene–butadiene rubbers were calculated and compared to their expected structures. Emulsion‐polymerized polybutadiene rubber and a series of solution‐polymerized polybutadienes made with different catalysts had different degrees of random branching, and evidence is presented indicating that the different available catalyst systems provide some latitude in making rubbers of different branching contents. Random branching analyses on a series of emulsion‐polymerized styrene–butadiene rubbers revealed the dependency of branching on molecular weight and molecular weight distribution. The influence of polymerization temperature on the branching of emulsion‐polymerized styrene–butadiene rubber was also studied.
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