Abstract
Cold flow is a well-known characteristic and also an unresolved drawback for uncured rubber materials. In this paper, a simple approach of retarding the cold flow of cis-1,4-polybutadine (BR) elastomer is reported by controlling the phase separation and crystallization that occurred in immiscible BR/trans-1,4-polyisoprene(TPI) blends. The BR/TPI blends showed an untypical phase diagram below 150 °C. Upon crystallization the amorphous BR facilitates the nucleation of TPI. The higher BR content, the less surface roughness of the TPI crystals and then the larger dendritic pattern, which resulted from the cold flow of BR, was observed in the microstructure. The BR/TPI blends with the highest resistance to cold flow were obtained by optimizing the composition and thermal treatment in such a way that small soft amorphous BR domains were entrapped in the rigid TPI crystalline phase. It is expected that this study could provide a simple way for the prevention of cold flow of rubber materials.
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