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|標題:||Melting temperature depression for low ether content polyether-polyester block copolymers with amide linkages||作者:||Ho, R.M.
|關鍵字:||polyether-polyesters;polyetheramides;copolymers;equilibrium melting;melting temperature depression;nonlinear Hoffman-Weeks extrapolation;hard segment length;point depression;poly(butylene terephthalate);diblock copolymer;polymer blends;crystallization;behavior;polystyrene;scattering;morphology||Project:||Journal of Polymer Research-Taiwan||期刊/報告no：:||Journal of Polymer Research-Taiwan, Volume 6, Issue 2, Page(s) 79-89.||摘要:||
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-m(o) obtained from nonlinear extrapolation is much higher than the T-m(o) obtained from the Hoffman-Weeks extrapolation, similar trend regarding the composition dependence of T-m(o) have been found.
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