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Spherulites of long-chain branched cis-1,4-polybutadiene

Morphological features of melt crystallized cis-1,4-polybutadiene (cPBD) were examined by means of polarized light microscopy. Three samples of similar molecular weight characteristics but different levels of long-chain branching were studied. The two low-branching samples exibited typical spherulitic morphology. The spherulites were of banded texture at higher crystallization temperatures (T c ); the band period decreased with decreasing T c and eventually became unidentifiable at T c < ca.-40°C. The spherulitic growth rate decreased significantly with the increasing level of branching