Degradation Mechanism of Polyethylene by Infrared Analysis

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  • EBISAWA Humihiro
    Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation
  • HOSHINO Mitsutoshi
    Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation
  • SATO Yukihiko
    Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation

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Other Title
  • ポリエチレンの紫外線劣化　Ｉ　　赤外線吸収スペクトルからみたポリエチレンの劣化機構
  • セキガイセン キュウシュウ スペクトル カラ ミタ ポリエチレン ノ レッカ

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Description

Photodegradation of high-density polyethylene (HDPE) exposed in a weathermeter has been investigated from the relation between yield strength or elongation and the concentrations of various functional groups. The amount of the functional groups in the degraded polyethylene exposed in a Sunshine carbon ark weathermeter was accurately measured with a Fourier-transformed infrared spectroscopy. The decrease of elongation in HDPE was not proportional to the concentration of carbonyl group. The mechanism was estimated as follows. (1) The decrease in the elongation of polyethylene without UV absorber is caused mainly by the scission of the main chain. (2) The decrease in elongation of the polyethylene stabilized with UV absorber is related mainly to the formation of crosslinking. From these results, molecular weight, molecular weight distribution and / or gel fraction are considered to be proper parameters for the photodegradation of HDPE compared with the concentration of carbonyl groups.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 35 (7), 429-433, 1978

    The Society of Polymer Science, Japan

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