Thermal decomposition of azo groups of polyamide 6 radical initiator

被引:0
|
作者
Hirano, T
Fujii, T
Amano, R
Onimura, K
Tsutsumi, H
Oishi, T
机构
[1] UBE Ind Ltd, Polymer Lab, Ube, Yamaguchi 7558633, Japan
[2] Yamaguchi Univ, Fac Engn, Ube, Yamaguchi 7558611, Japan
关键词
polyamide; 6; radical initiator; azo group; thermal decomposition; differential scanning calorimetry; ultraviolet measurement;
D O I
10.1295/koron.56.557
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Thermal decomposition of azo groups of polyamide 6 radical initiators (PA6ini) with molecular weights (M-n) of 5 x 10(3) (PA6ini-1) and 13 x 10(3) (PA6ini-2), which were obtained from a polyamide 6 prepolymer and 4,4'-azobis(4-cyanopentanoyl chloride), was measured by differential scanning calorimetry (DSC) and ultraviolet (UV) absorption in solid state and in solution (formic acid and 2,2,2-trifluoroethanol), respectively. Thermal decomposition of PA6ini in solid state initiated at a lower temperature than that of 4,4'-azobis(4-cyanopentanonic acid) (ACPA), and the peak top temperature of PA6ini decreased with increasing molecular weight. Activation energies of azo group decomposition of PA6ini-1 and PA6ini-2 in solid state were 102.3 kJ mol(-1) and 88.9 kJ mol(-1), respectively. The rate constants of azo group decomposition of ACPA and PA6ini were affected by solvents. The rate constant of azo group decomposition of PA6ini-2 in 2,2,2-trifluoroethanol was significantly influenced by concentrations of PA6ini. Activation energies of azo group decomposition of PA6ini were independent of solvents, and were similar to those in solid state.
引用
收藏
页码:557 / 564
页数:8
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