Abstract
The kinetics of fractionated polyethylenes was investigated by the method of dilatometry. A discontinuous change in crystallization rates was observed for molecular weights 4300 and 17300. This discontinuity is shown to be an important factor in clarifying the mechanism of the formation of extended-chain crystals. Extended-chain crystals were obtained within the region where folded-chain crystals were prohibited. Extended-chaincrystallization had a mode of three-dimensional growth. It is suggested that the formation of extended-chain crystals at atmospheric pressure is distinct from that under high pressure. A theory of polymer crystallization is proposed in order to explain the transition in crystallization rates.
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Sawada, S., Nose, T. Transition in Crystallization Rates of Fractionated Polyethylenes. Polym J 11, 227–232 (1979). https://doi.org/10.1295/polymj.11.227
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DOI: https://doi.org/10.1295/polymj.11.227