Abstract
The skin-core morphology of an injection moulded polymer product is due to the melting-crystallization phase transition. It is thus described in terms of thermal history and overall (nucleation and crystal growth) crystallization kinetic. Two Stefan problems have been analyzed to study the moving boundary appearing during polymer crystallization. Their difference is due to the constitutive equation for the heat flux. An improved Avrami equation is adopted for the overall crystallization kinetic. This accounts for the formation of a mushy region besides liquid and crystal phases. Both models have been efficiently discretized by a stable finite element method based on a semi-explicit finite difference approximation in time. The skin-core structure is well predicted by the Fourier-Stefan model.
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