Photo-Decomposition of-Polyurethane and Its Model Compounds

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  • OSAWA Zenjiro
    Department of Polymer Chemistry, Faculty of Engineering, Gunma University
  • NAGASHIMA Kosaku
    Department of Polymer Chemistry, Faculty of Engineering, Gunma University

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Other Title
  • 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
  • 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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Abstract

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.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 36 (2), 109-116, 1979

    The Society of Polymer Science, Japan

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