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The increase of average lamellar thickness of polymer crystals occurring during isothermal crystallization has been ascribed by K AWAI , H OSOI , and K AMIDE 1 to the phenomenon of molecular fractionation induced by crystallization. This explanation however, is not in agreement with several experimental observations. These observations are discussed and compared with an earlier explanation proposing fractionation during crystallization followed by crystal thickening.
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Mehta et al. (1972) studied this question.
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