熱分解ガスクロマトグラフィー/質量分析法による高分子の末端構造解析

概要

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The characterization of end groups in various practical polymers was carried out by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). In the first basic study, the characterization of end groups in standard monodispersed polystyrenes (PS's) polymerized with n-butyl lithium was achieved. By comparing the intensities of the peaks due to the end groups and the main chain on the pyrogram, the number-average molecular weight of PS up to ca. one million could be directly determined. Through this work, the accuracy and precision of Py-GC/MS for an end group determination were empirically evaluated. In a concerning second study, branched alkyl end groups of poly(methyl methacrylate)s, which were polymerized radically, it became possible to make a determination based on the observed pyrograms. The thus-obtained results demonstrated the practical applicability of Py-GC/MS for the characterization of end groups in industrially synthesized polymers. In third and fourth studies, the end groups in polycarbonates and water-soluble acrylic copolymers were investigated using reactive pyrolysis in the presence of an organic alkali, tetramethylammonium hydroxide. By this method, an accurate and rapid determination of their end groups became possible. Through these studies, Py-GC/MS proved to be applicable for end group determinations in various polymers.
社団法人日本分析化学会の論文
1998-10-05