Effect of residual amine catalysis on the thermal degradation of polyurethane elastomers.

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Bibliographic Information

Other Title
  • ポリウレタンエラストマーの熱劣化に及ぼす残存アミン触媒の影響
  • ポリウレタン エラストマー ノ ネツ レッカ ニ オヨボス ザンソン アミン

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Description

Remarkable reductions in the physical properties of polyurethane elastomers (PUEs) prepared from polymer with 4, 4′-diphenylmethane diisocyanate (MDI) were observed when they were subjected to high temperatures (above 105°C) for long periods of time (400hrs). These results were caused by the fact that PUEs were deteriorated by a decomposition of their left in urethane linkages which resulted from their having been attacked by triethylenediamine (TEDA) residues in the PUE.<br>Deteriorations were observed in the center parts of PUE samples over 1cm thickness. Associated amine degradation products were later detected. Also, urea compounds occuring from the amine degradation in samples thicker than 1cm were determined directly from degraded PUE by FT-IR. By using diethylene glycol and butane diol as chain extender, a new PUE has been developed with reduced hardness. Additionally, the mechanisms causing amine residues to degrade PUEs were discussed.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 68 (4), 244-250, 1995

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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