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Effects of prior cooling rates on Tg and sub-Tg heat flow transitions of cured epoxy resin

被引：6
作者：
Chen, XX
Li, SJ [1 ]
机构：
[1] Fudan Univ, Dept Macromol Sci, Shanghai 200433, Peoples R China
[2] Fudan Univ, Lab Macromol Engn Polymers, Shanghai 200433, Peoples R China
来源：
MACROMOLECULES | 1999年 / 32卷 / 07期
关键词：
D O I：
10.1021/ma9806965
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The relationship between the glass transition temperature (Tg) of unaged samples and cooling treatments from above Tg and the sub-Tg heat flow transition was studied. The disparity between original Tg and sub-Tg heat flow transitions was strongly influenced by the prior cooling rate. Sub-Tg heat flow transition was not observed when the cooling rate was lower than 20 °C/min. The original Tg was attributed to the motion of the internal stress relaxed molecular chain, while the sub-Tg heat flow transition was attributed to the motion of the internal stress unrelaxed molecular chain.
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页码：2387 / 2390
页数：4
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