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- W2089791735 abstract "Abstract Various polyethylenes have been crystallized from the melt at pressures between 0 and 6 kbar. Their atmospheric melting points fall, in each case, into two non-overlapping regions, with a sharp changeover at a pressure in the region of 3 kbar which is a decreasing function of molecular weight. This separation is used in conjunction with differences in spherulitic texture to distinguish chainfolded polymer (which predominates at lower pressures) from chain-extended polyethylene produced at higher pressures. The thickness of chain-extended lamellae increases with crystallization temperature at a given pressure, with crystallization pressure at a constant super-cooling and with molecular weight (between 2·104 and 5·104) for crystallization at the same temperature and pressure. It is then shown from differential thermal analysis of crystallization as it occurs that chain-folded and chain-extended polyethylene result from two distinct processes and that when both occur at the same pressure and temperature, chain-extended growth is the faster. This and the fact that it is more difficult to crystallize shorter molecules as chain-extended lamellae disprove nearly all previously suggested explanations of chain-extended growth in polyethylene." @default.
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- W2089791735 date "1974-02-01" @default.
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- W2089791735 title "On chain-extended and chainfolded crystallization of polyethylene" @default.
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- W2089791735 doi "https://doi.org/10.1080/14786437408213273" @default.
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