Direct Analysis of Graft Structure of Maleic Anhydride Grafted Polypropylene by Nuclear Magnetic Resonance Spectroscopy

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  • 核磁気共鳴分光法による無水マレイン酸グラフトポリプロピレンのグラフト構造直接解析
  • カク ジキ キョウメイ ブンコウホウ ニ ヨル ムスイ マレインサン グラフトポリプロピレン ノ グラフト コウゾウ チョクセツ カイセキ

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Abstract

The graft structure of maleic anhydride (MA) grafted polypropylene (PP), MA-g-PP, which is an industrial product, was directly characterized by 400 MHz (1H) one- and two-dimensional nuclear magnetic resonance spectroscopy (NMR), which was optimized to characterize the graft structure of industrial MA-g-PP. The NMR analyses demonstrated two graft structures of industrial MA-g-PP. One was the well-known form of single succinic anhydride rings; the other was the anhydride ring attached to the chain terminal via a double bond; the itaconic anhydride (IA)-terminal. All 1H, 13C-NMR chemical shifts of the IA-terminal were first assigned. The grafting MA (g-MA) contents of MA-g-PP were quantified by 1H-NMR. The g-MA contents and the ratios of (IA-terminal/g-MA) of MA-g-PP might be correlated. The decrease in the number-average molecular weight of PP due to the grafting of MA onto PP was thought to be influenced by the reaction, in which the IA-terminal is formed. Within the g-MA contents, 0.05∼2.09 mol%, the graft structure did not influence the tacticity of PP.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 55 (8), 547-554, 2006

    The Japan Society for Analytical Chemistry

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