Grafting of Vinyl Polymers onto Aluminum Hydroxide by the Polymerization Initiated by Azo Groups Introduced onto the Surface

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  • TSUBOKAWA Norio
    Department of Chemistry and Chemical Engineering, Faculty of Engineering Niigata University
  • ENDOH Mayumi
    Department of Chemistry and Chemical Engineering, Faculty of Engineering Niigata University
  • HASHIMOTO Kumi
    Department of Chemistry and Chemical Engineering, Faculty of Engineering Niigata University

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  • アゾ基を導入した水酸化アルミニウムからのビニルモノマーのラジカルグラフト重合
  • アゾキ オ ドウニュウシタ スイサンカ アルミニウム カラ ノ ビニル モノマ

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Abstract

To modify the aluminum hydroxide surface, the grafting of polymers onto the surface by the polymerization of vinyl monomers initiated by azo groups introduced onto the surface was investigated. The introduction of azo groups onto aluminum hydroxide was achieved by the direct condensation of surface hydroxyl groups with 4, 4'-azobis (4-cyanopentanoic acid) using N, N' -dicyclohexylcarbodiimide as catalyst : The amount of azo groups introduced onto the surface was determined to be 0.41 mmol/g. It was found that the radical polymerizations of vinyl monomers, such as methyl methacrylate styrene, and N-vinylcarbazole, were successfully initiated by azo groups introduced onto the surface and the corresponding polymers were grafted onto the surface. The photopolymerization of vinyl monomers was also initiated by the azo groups introduced onto aluminum hydroxide to give polymer-graf ted aluminum hydroxide. These results indicate that the graft polymerizations are started from surface radicals formed by the thermal or photo decomposition of surface azo groups on aluminum hydroxide and grafted chains are propagated from the surface. In addition, postgraft polymerization of vinyl polymers was initiated by surface grafted chains having pendant peroxycarbonate groups and branched polymer-grafted aluminum hydroxide was obtained. The wettability of aluminum hydroxide was drastically turned from hydrophilic to hydrophobic by the grafting of polymers onto the surface.

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