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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. shu

Thermmooxidative Degradation of Copolyether-Urethane

1.
a Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
2.
b School of Chemical Engineering and Materials Science, Beijing Institute of Technology, Beijing

Received Date: 23 November 1998
Available Online: 14 May 1999
Fund Project: 国家"863"计划基金资助课题(863-715-19-01-01) (863-715-19-01-01)

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℃.
- ethylene oxide/tetrahydrofuran copolymer polyurethane,
- thermooxidative degradation,
- FT-IR,
- NMR
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