Abstract
A series of controlled microstructure polybutadiene rubbers (PBs) was synthesized via anionic polymerization. Their structure and proper ties are analyzed by means of GPC, 13C NMR, DSC, and DMA, and compared to the behavior of some commercial high cis rubbers. Thermal analyses results indicate the presence of crystalline domains of different nature in PBs with high cis-1,4 and high trans-1,4 isomers content, while rubbers with high content of vinyl-1,2 units do not show evidence of crystals. A shift in Tg to higher temperatures as vinyl content increases is observed; an expression was found for predicting Tg of rubber from microstructure data.
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