Some Aspects of the Graf tpolymerization of Methacrylates onto Carbon Black Surface by Butyllithium

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  • ブチルリチウムを用いるカーボンブラック粒子表面へのメタクリル酸エステルのグラフト重合
  • ブチル リチウム オ モチイル カーボン ブラック リュウシ ヒョウメン エ

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The graftpolymerization of methacrylates such as methyl methacrylate (MMA) and butyl methacrylate onto carbon black (CB) surface catalyzed by butyllithium (BuLi) or CB-BuLi complexes in toluene has been carried out at 0°C in nitrogen. Differing from styrene, the polymerization of MMA in the presence of CB by BuLi indicated that the initiation proceeds rapidly and that the reaction of BuLi with CB surface is negligible. The intrinsic viscosities of the homopolymer formed in the presence of HAF black with pretreated sodium borohydride solution were found to be lower than those of the ones formed in the presence of original black. Methacrylates grafted onto colour black surface by CB-BuLi complexes, differently from acrylonitrile, gave a gel containing CB particles. As the exceeding amount of free BuLi beyond the complex formation increases, the gel fractions decreased rapidly, paralleling an equally decrease in grafting ratio. Thus the grafting ratio could be changed by the amount of BuLi added originally as the complexes. Furthermore, the rate of polymerization of methacrylates by BuLi was much faster than that of graftpolymerization by CB-BuLi complexes. The mechanism for the formation of gel is proposed to explain these observations.

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