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
1981 Volume 54 Issue 10 Pages 599-605
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1981 Volume 54 Issue 10 Pages 599-605
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.
