引用本文:
罗善国, 张建国, 谭惠民, 景凤英, 陈福泰. 环氧乙烷/四氢呋喃共聚醚聚氨酯的热氧降解[J]. 应用化学,
1999, 16(4): 10-13.
Citation: Luo Shanguo, Zhang Jianguo, Tan Huimin, Jing Fengying, Chen Futai. Thermmooxidative Degradation of Copolyether-Urethane[J]. Chinese Journal of Applied Chemistry, 1999, 16(4): 10-13.
Citation: Luo Shanguo, Zhang Jianguo, Tan Huimin, Jing Fengying, Chen Futai. Thermmooxidative Degradation of Copolyether-Urethane[J]. Chinese Journal of Applied Chemistry, 1999, 16(4): 10-13.
环氧乙烷/四氢呋喃共聚醚聚氨酯的热氧降解
摘要:
采用FT-IR和13C NMR、1H NMR技术研究羟基环氧乙烷/四氢呋喃共聚醚(EO/THF)聚氨酯在90℃空气中降解产物的结构.结果表明,聚醚聚氨酯的热氧降解既有软段的氧化降解,又有硬段的解缩聚过程,同时还存在重聚合反应;并且软、硬段互有影响,硬段中的交联结构和氢键等增加了软段的热氧稳定性,而软段降解产生的醇的含量和结构影响硬段的解缩聚和重聚合过程.90℃下聚氨酯的热氧降解并不发生硬段的氧化反应,也不存在碳化二亚胺和假脲醚结构.
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关键词:
- 羟基环氧乙烷/四氢呋喃共聚醚聚氨酯
- / 热氧降解
- / 核磁共振波谱
- / 红外光谱
English
Thermmooxidative Degradation of Copolyether-Urethane
Abstract:
The thermooxidative degradation of ethyleneoxide/tetrahydrofuran(EO/THF) copolyether-urethane in air has been investigated by FT-IR, 13C NMR and 1H NMR. It is found that the degradation of the polyether-urethane consisted of the oxidation of soft segments, depolymerization of the hard segments and the repolymerization of isocyanates with alcohols. And the soft and hard segments show influences each other during degradation that the thermooxidative stability of the soft segments is improved by crosslinking structure and hydrogen bondings in the hard segments and the degradation products of the soft segments affect the depolymerization and repolymerization of the hard segments. No obvious oxidation of the hard segments and no carbodiimide or pseudo-urea ether groups are found on degradation at 90℃.
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