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A simple model of flow-induced crystallization memory

Flow induced crystallization of polymer systems exhibits strong memory effects. Crystalline structures gradually change when the flow is switched off and the polymer is relaxed prior to crystallization. A simple model based on the multidimensional theory of crystal nucleation [1] is proposed. Steady, potential flow applied to a polymer fluid above melting temperature (T p > T m ) results in molecular orientation of crystallizing units. The flow controls formation of molecular clusters which convert into athermal nuclei when the system is cooled down to crystallization temperature, T c < T m . Orientation effects gradually disappear when the melt is relaxed above T m in the absence of flow or stress.