The crystallization kinetics of a range of fractions of poly(ethylene oxide) are presented and analyzed. It is concluded that deviations from the Avrami equation with exponent of 3 are mainly due to rejection of low molecular weight molecules for the low molecular weight fractions ( M̄ n < 6,000) and to a process of crystal perfecting for the high molecular weight fractions ( M̄ n > 6,000).
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Beech et al. (1972) studied this question.
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