Effect of carboxylic end groups on thermooxidative stability of PET and PBT

被引:82
作者
Bikiaris, DN [1 ]
Karayannidis, GP [1 ]
机构
[1] Aristotelian Univ Salonika, Dept Chem, Lab Organ Chem Technol, GR-54006 Salonika, Macedonia, Greece
关键词
D O I
10.1016/S0141-3910(98)00094-9
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A series of poly(ethylene terephthalate) and of poly(butylene terephthalate) samples containing different amounts of carboxyl end groups were prepared by chain-extension reaction with diepoxides. The effect of the carboxyl content on thermooxidative degradation was studied, using as criteria the induction period of oxidation and the stabilisation coefficient, both obtained by differential scanning calorimetry during isothermal or dynamic heating of the samples under air and nitrogen atmosphere. It was found that as the carboxyl content decreases the thermooxidative stability increases. However, in some more chain extended (crosslinked) samples the thermooxidative stability degreased. This abnormal behaviour was attributed to the lower degree of crystallinity of these samples. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:213 / 218
页数:6
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