ポリウレタンの劣化　ＩＶ　　ポリウレタンおよびそのモデル化合物の光分解

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タイトル別名
  • Photo-Decomposition of-Polyurethane and Its Model Compounds
  • ポリウレタン オヨビ ソノ モデル カゴウブツ ノ ヒカリ ブンカイ ポリウレ

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Photo-decomposition of polyurethane prepared from polyester dial and diphenylmethane-p, p′-diisocyanate and its model compounds (N-phenylcarbamates; substituents: methyl (MPC), ethyl (EPC), propyl (PrPC), butyl (BuPC), phenyl (PPC)) was studied by means of electron spin resonance (ESR) and mass spectrometries. Photo-irradiation of the samples at 77K gave mainly singlet ESR spectra, which were deduced to the overlapped signal of the first three radical species among the four radical species generated by the cleavage of N-C and C-O bonds in the urethane groups. The ratio of CO/CO2 in the gaseous products was affected by the substituents of the samples, namely, ca. 0.4 for MPC, EPC, PrPC, and BuPC; ca. 2 for PPC; ca. 1 for the polyurethane. These results suggest that the photo-decomposition of the polyurethane was initiated by the cleavage of N-C and C-O bonds in the urethane groups.

収録刊行物

  • 高分子論文集

    高分子論文集 36 (2), 109-116, 1979

    公益社団法人 高分子学会

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