Radical Polymerization and Copolymerization of Zinc Methacrylate

YAMADA Bunichiro, YONENO Hiroshi, OTSU Takayuki

doi:10.1246/nikkashi.1976.988

Zinc methacrylate (ZMA), prepared from methacrylic acid and zinc hydroxide, was polymerized and copolymerized by using α, α'-azobisisobutyronitrile as an initiator in N, N-dimethylformamide. The polymer formed is insoluble in any of the organic solvents examined and contains unchanged carbon-carbon double bond (20-30%) as a pendant group. The content of the double bond was found to be independent of the monomer concentration and of the conversion. This could be explained as follows: the intermolecular addition occurs during the formation of poly- ZMA and the poly-ZMA, having double bond in its side chain, is formed. Next, the rapid exchange reaction between the polymer and ZMA monomer to form methacryloyloxy group continues. The ligand exchange reaction brings about crosslinking of the polymer.<BR>Content of syndiotactic triad of the polymers obtained from ZMA wa s determined after conversion of them to poly (methyl methacrylate). The poly (methyl methacrylate) contains syndiotactic triad (about 40%) and this content is almost independent of polymerization temperature over the range from -78 to 150°C.<BR>In order to estimate the radical polymeriza tion ability of ZMA, copolymerizat ions with styrene and methyl methacrylate were made. Q and e values of ZMA were calculated on the basis of the results of the copolymerization with styrene to be 1.45 and 0.68, respectively.

Radical Polymerization and Copolymerization of Zinc Methacrylate

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