Stereocontrol in radical polymerization of acrylic monomers |
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| Authors: | Yoshio Okamoto Shigeki Habaue Yutaka Isobe Tamaki Nakano |
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| Institution: | 1. Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;2. Graduate School of Material Science, Nara Institute of Science and Technology, Takayama-cho 8916-5, Ikoma, Nara 630-0101, Japan |
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| Abstract: | A clear effect of Lewis acids, such. as scandium trifluoromethanesulfonate Sc(OTf)3], on stereocontrol during the radical polymerization of a designed monomer, benzyl α-(methoxymethyl)acrylate was found. This Lewis acid also influenced the stereochemistry in the radical polymerization of methyl methacrylate giving a less syndiotactic and more isotactic polymer, although many Lewis acids were not effective. A catalytic amount of Lewis acids, such as Y(OTf)3 and Yb(OTf)3, also significantly enhanced isotactic-specificity during the radical polymerization of acrylamide and its derivatives, N-isopropylacrylamide (NIPAM) and N,N-dimethylacrylamide. Obvious solvent and temperature effects on tacticity were observed in these polymerizations, and poly(NIPAM) with >80% triad isotactic content has been obtained in the presence of Lewis acids. |
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