Abstract
Crystallization from the melt of trans-1,4-polyisoprene was followed using Fourier-transform infra-red spectroscopy. The spectral subtraction factor versus time was obtained at the crystallization temperature and after cooling to 25°C for fractions and for the parent material. Crystallization of the β crystal form was followed at 36 and 43°C and of the α form at 43 and 51°C. Samples crystallized at 25°C and subsequently annealed at 43°C were also monitored. The amorphous fraction for prenucleated melt-crystallized α-form-containing samples increased with molecular weight at the crystallization temperature and after cooling to 25°C. Samples containing the β crystal form showed a molecular-weight dependence at a crystallization/annealing temperature of 43°C that disappears upon cooling the sample to 25°C. The results are discussed in terms of lamellar surface disorder and lamellar thickness distribution.
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