The crystallization behavior of samples of poly(ethylene oxide) of varying molecular weights and molecular weight distributions has been studied under varying conditions of shear rate and temperature. These experiments have been carried out in two devices. One is a shearing parallel‐plate instrument that allows direct observation of the crystallizing medium. The other is a shearing concentric‐cylinder dilatometer. In general, shear enhanced the rates of crystallization and nucleation. However, conditions were encountered under which shear retarded crystallization and/or nucleation. Combination of the data from these two devices suggests that, under certain shearing and sample conditions, chain slippage and particle fracture lead to decreased apparent rates of nucleation and/or crystallization.
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Fritzsche et al. (1976) studied this question.
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