The double endothermic phenomenon of polytetrahydrofurans in the melting temperature region期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The double endothermic phenomenon of polytetrahydrofurans in the melting temperature region

Authors:	M Tsuchiya T Kojima

Institution:	(1) Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan;(2) Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan

Abstract:	Summary A double endothermic peak appears in the DSC curve of a PTHF oligomer. In order to investigate this phenomenon, a two-component blend of PTHF was prepared with a number average molecular mass of M=1400, and the double endothermic phenomena were investigated by TM-DSC. The larger the amount of the long chain component in the PTHF blend, the smaller the difference between the C_p-T curve and the normal DSC curve. The amounts of endothermic energy H_endo,1, H_endo,2 and exothermic energy H_exo,1, H_exo,2 in each peak at infinite modulation frequency were estimated.

Keywords:	double endotherm polytetrahydrofuran molecular mass blend TM-DSC
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