ポリプロピレン及びゴムの劣化の指標としての酸素分析

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タイトル別名
  • Determination of oxygen as deterioration indices of polypropylen and rubber
  • ポリプロピレン オヨビ ゴム ノ レッカ ノ シヒョウ トシテノ サンソ ブン

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Structural variation in deterioration process of plastics and rubber has been investigated by infrared spectrometry (IR), by gel permeation chromatography as well as by tensile strength tests. But, to determine the index, the oxygen determination technique has not been effectively studied yet in spite of its expected benefits about the quantity of used sample and the preciseness of the method. The experimental results of the direct oxygen determination applied to the investigation was compared with those of IR, tensile strength tests and elongation tests. As samples, were used polypropylene (PP), an antioxidant containing PP, degradation accelerator containing PP, and valcanized natural rubber rings. Rubber used were unconditioned, underwent 4-fold extention, and contacted with copper under 4-fold extention prior to the tests, respectively. These PP and rubbers in each condition were irradiated with ultra violet rays (UV). The rubber samples without undergoing UV irradiation were also employed. All samples thus prepared were subjected to the investigations of time-course change during (910) days by direct oxygen determinations, as well as by IR, by tensile strength tests, and by elongation tests. In accordance with deterioration process of PP and rubbers, there was found to be a correlation between the oxygen content and the tensile strength. The pure PP samples and those containing antioxidants, degradation accelerators gave remarkable defference about the variation of their oxygen content in the induction period. The deterioration rate of the rubbers was most increased by UV irradiation, next by contacting with copper and then by loading mechanically. Thus the oxygen determination was an effective method to obtain the indices of deterioration as well as to characterize the samples mechanochemically. As the deterioration can be determined only with 1 mg of the sample within 15 minutes, and ±0.3% in the range of error, the information about the deterioration can be obtained by this method faster than IR, or elongation technique.

収録刊行物

  • 分析化学

    分析化学 28 (3), 173-178, 1979

    公益社団法人 日本分析化学会

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