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Melting temperature depression for low ether content polyether-polyester block copolymers with amide linkages

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Abstract

Melting behavior of a series of polyether-polyester block copolymers with low ether contents was studied. Significant melting-reorganization-remelting was suggested by means of differential scanning calorimetry. The equilibrium melting temperature of the copolymers was obtained by using the Hoffman-Weeks extrapolation. It has been found that the use of the on-set melting temperature for the Hoffman-Weeks plots is less reliable than the use of the corrected peak melting temperature. Copolymerization of polyetheramides with polyesters leads to a significant melting temperature suppression for the polyester crystal. We hypothesize that the locations of the junction points between blocks can be treated as chain ends for the crystallizable polyester blocks: the polyether-polyesters grow to form extended chain-like crystals with lamellar thickness limited by the polyester block length. For comparison, the nonlinear Hoffman-Weeks treatment, recently proposed by Marand, has also been applied to examine the behavior of melting temperature depression. Although the T om obtained from nonlinear extrapolation is much higher than the T om obtained from the Hoffman-Weeks extrapolation, similar trend regarding the composition dependence of T om have been found.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Chung-Hsing University, Taichung, 40227, Taiwan, ROC

    Rong-Ming Ho & Chuang-Wei Chiu

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  1. Rong-Ming Ho
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  2. Chuang-Wei Chiu
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Correspondence to Rong-Ming Ho.

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Ho, RM., Chiu, CW. Melting temperature depression for low ether content polyether-polyester block copolymers with amide linkages. J Polym Res 6, 79–89 (1999). https://doi.org/10.1007/s10965-006-0074-3

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