Effect of N, N-Dialkylformamides as Regulator on the Gel formed during the Anionic Graft Polymerization of Methyl Methacrylate onto the Surface of Color Black

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  • カラーブラック表面へのメタクリル酸メチルのアニオングラフト重合中に生成ずるゲルへのN, N-ジアルキルホルムアミドの調整剤としての効果
  • カラーブラック表面へのメタクリル酸メチルのアニオングラフト重合中に生成するゲルのN,N-ジアルキルホルムアミドの調整剤としての効果
  • カラー ブラック ヒョウメン エ ノ メタクリルサン メチル ノ アニオン グ

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The graft polymerization of methyl methacrylate (MMA) onto the surface of color black (CB) has been investigated using CB-butyllithium (BuLi) complexes as catalyst and N, N-dialkylformamides, such as dimethylformamide (DMF), and related compounds as regulator. In the absence of DMF, a large quantity of gel containing CB particles yields and the grafting ratio, that is, the quantity of poly-MMA fixed on the surface of CB, is found to exceed 100 to 300% by weight for this grafting process. The gel fraction, however, decreases with an addition of DMF to MMA, consequently giving a colloidal product which forms a stable dispersion in organic solvents such as acetone. The grafting ratios also decrease with the increase in the concentrations of DMF. In addition, N, N-dialkylacetamides such as diethylacetamide are found to be efficient regulators. On the other hand, the reaction of BuLi with DMF is also known to give the amino alkoxide, BuCH (OLi) N (CH3) 2 (CA. 79, 91504n). The mechanism by which DMF regulates the gel formation is proposed to explain the experimental results.

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