ポリブタジエンおよびコポリ(ブタジエン・アクリロニトリル)の熱分解ガスクロマトグラフィー

概要

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An analytical method for determining the total 1, 4-content of polybutadiene and the composition of copoly-butadiene-acrylonitrile was investigated by means of curie point pyrolysis-gas chromatography. The molar ratio of butadiene and 4-vinyl cyclohexene calculated from the corresponding peaks appearing on the pyrogram at 434°C by making relative sensitivity correction for the flame ionization detector showed a linear relation with the total 1, 4-content. In the case of copoly-butadiene-acrylonirile, the yield of acrylonitrile (molar fraction) calculated from the peaks at 541°C showed a linear relation with the acrylonitrile content (mole %) in the polymer. The ratios of the corresponding peak heights, i.e., ethylene/butadiene, propyrene/butadiene, C5-hydrocarbon/butadiene, methacrylonitrile/acrylonitrile, and 4-vinylcyclohexene/butadiene, were compared and the "Boundary effect", or the different probability of splitting off of a monomer unit from the end of the polymer chain depending on whether the neighboring monomer unit is the same or not was estimated for random or alternated copolymers as well as for a mixture of homopolymers.
社団法人日本分析化学会の論文