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Spherulite Growth of cis-1,4-Polyisoprene Isolated from Natural Rubber

The crystallization behavior of cis-1,4-polyisoprene, isolated from natural rubber, was investigated by polarized light microscopy. Natural rubber was purified by deproteinization followed by transesterification to remove protein, phospholipid, and fatty acids present in the rubber. The purified rubber was fractionated into seven fractions. For the fractionated rubbers, spherulite growth was observed during the course of crystallization. The size of the spherulites increased linearly with crystallization time, and thus, growth rate was estimated. The growth rate was proportional to TΔT, where ΔT is supercooling. Because the slope of the line was independent of the molecular weight, the growth rate was confirmed to be a function of diffusion of the rubber.