Abstract
Radiation polymerization of methyl methacrylate (MMA) was studied in the presence of two liquid crystals: N-( p-methoxybenzylidene)- p-butylaniline (MBBA, nematic) and cholesteryl 2-(ethoxy—ethoxy) ethyl carbonate (CHEECO, cholesteric). For comparison, polymerization was also carried out in the presence of benzene and cholesterol. Tacticities of the resultant poly(methyl methacrylate) were determined from nuclear magnetic resonance spectroscopy. Enhancement of syndiotacticity of the polymer obtained in the presence of cholesteric liquid crystal was observed. The rates of polymerization of pure MMA and MMA with different additives at various concentrations were studied. The viscosity-average molecular weights at one dose were also determined. Replica polymerization in the presence of preformed isotactic poly(methyl methacrylate) [i-PMMA] or syndiotactic poly(methyl methacrylate) [s-PMMA] with and without CHEECO was studied. Enhancement of syndiotacticity was observed in the presence of i-PMMA with and without CHEECO.
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