Abstract
The dependence of the formation of extended-chain crystals under high pressure on molecular weight was investigated in a quantitative way for seven kinds of fractionated polyethylenes with different molecular weights ranging from 4300 to 410000. The extent to which extended-chain crystals were produced in the cooling crystallization increased with increasing pressure. It was shown that the pressure at which the changeover from folded-chain to extended-chain crystallization took place was inversely proportional to the .molecular weight in the range of the molecular weight studied. To explain the molecular-weight dependence, a model of a bundle-like nucleus formation is proposed as a crystallization mechanism of extended-chain crystals. It is shown that longer molecules are kinetically favorable for producing extended-chain crystals.
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Sawada, S., Kato, K. & Nose, T. Molecular-Weight Dependence of the Formation of Extended-Chain Crystals in Polyethylene under High Pressure. Polym J 11, 551–558 (1979). https://doi.org/10.1295/polymj.11.551
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DOI: https://doi.org/10.1295/polymj.11.551