Stereoregularities of Ring-containing Polymethacrylates Obtained by Radical Polymerization

Nakahata Hisataka, Nishino Jun, Sakaguchi Yasuyoshi

doi:10.1295/polymj.2.555

Phenyl, 2-naphthyl(2-Np-MA), 1-naphthyl(1-Np-MA), 9-fluorenyl, 5,6,7, 8-tetrahydro-1-naphthyl, cyclohexyl(CH-MA), cyclopentyl(CP-MA), and decahydro-2-naphthyl(D-MA) methacrylates were polymerized in bulk, benzene, and n-hexane by radical initiators. The polymers were converted into poly (methyl methacrylate)(PMMA) by hydrolysis followed by methylation. The tacticities of the polymers were studied by comparing the IR and NMR spectra of the derived PMMA’s. The polymers containing aromatic substituents were more isotactic than conventional PMMA, and especially poly(2-Np-MA) prepared in n-hexane and poly(1-Np-MA)’s were considerably isotactic. On the other hand, tacticities of poly(CH-MA)’s, poly(CP-MA)’s, and poly(D-MA)’s were nearly the same as those of conventional PMMA. These results suggest that aromatic rings of the methacrylates seem to promote the formation of isotactic sequence and this effect is enhanced with naphthyl groups, but the aliphatic rings have little effect on such stereoregulation.

Stereoregularities of Ring-containing Polymethacrylates Obtained by Radical Polymerization

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