Polymerizabilities of Several Polar Vinyl Monomers by Imidazole |
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Authors: | Satoshi Morita Hiroshi Inoue Natsuki Yamashita Toshihisa Maeshima |
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Affiliation: | Department of Applied Chemistry Faculty of Science and Engineering , Kinki University Kowakae , Higashi-Osaka, Japan |
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Abstract: | Polymerizabilities of several polar vinyl monomers in the presence of imidazole (Im) have been studied in CDC13 and CD3OD by NMR spectra. Acrylic acid formed a bimolecular adduct with Im as the initial adduct, while methacrylic acid was not obtained, On the other hand, methyl acrylate, methyl methacrylate (MMA), acrylamide (AAm), and acrylonitrile formed the initial adduct between Im and monomer, respectively. In these monomers, AAm and MMA gave each polymer in tetrahydrofuranat room temperature. The number-average molecular weight ([Mbar]n) of AAm polymers was determined to be in the range of 1000 to 1500, and the [Mbar]n of MMA polymers was found to be in the range of 2500 to 4500, The rate of polymerization Rp was expressed by the equations Rp = k[Im][AAm] and Rp = k[Im] [MMA]2, respectively. The activation energy ER was obtained by Arrheniuss's plots as ER(AAm) = 9.6 kcal/mol and ER(MMA) = 3.8 kcal/mol. These polymerization mechanisms are discussed on the basis of these results. |
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