Determination of Percentage Contents of Styrene and α-Methylstyrene in Styrene-based Polymer Materials

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  • TAN Shigeru
    Institute of Food Hygiene, Japan Food Hygiene Association
  • OKADA Taro
    Institute of Food Hygiene, Japan Food Hygiene Association

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Other Title
  • スチレン系合成樹脂製品中のスチレン及びα-メチルスチレン含有率の測定
  • スチレンケイ ゴウセイ ジュシ セイヒンチュウ ノ スチレン オヨビ アルファ
  • Hygienic Studies on Plastic Containers and Packages. VIII
  • プラスチック容器包装に関する衛生学的研究 (第8報)

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Description

The percentage contents of styrene (St) and α-methylstyrene (α-MSt) in St-based polymers such as polystyrene (PS), acrylonitrile-St (SAN) and acrylonitrile-butadiene-St (ABS) products were determined by pyrolysis-gas chromatography.<br>St-based polymers were dissolved in dichloromethane and 4μl of 5% polymer solution was used for the determination. The calibration curves from 40 to 200μg of PS and poly α-methylstyrene (Pα-MS) were linear.<br>Suitable pyrolysis temperatures for PS and Pα-MS for the formation of St and α-MSt were 500-640°C and 420-600°C, respectively. Moreover, the repeatability was found to be 1.61 and 2.22% for 0.2mg of the polymers, respectively.<br>Commercial St-based polymer materials such as containers, trays, lids, cups, sheets, ladles and graters were analyzed, and most of the samples were found to contain more than 50% St and/or α-MSt.

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