Abstract
Copolymers of methyl methacrylate with ethyl acrylate and of methyl methacrylate with n-butyl acrylate are prepared by free radical copolymerization and analyzed with respect to chemical composition distribution. The copolymers were separated with respect to chemical composition in the order of increasing methyl methacrylate content by gradient HPLC using a normal stationary phase and toluene-methylethylketone as the mobile phase. For the samples under investigation, the molar mass does not affect the separation. Quantitative information on the chemical heterogeneity is obtained by calibrating the chromatographic system with chemically narrow distributed low-conversion copolymers. In agreement with the theory it is found that for high-conversion samples the chemical heterogeneity increases with increasing content of ethyl acrylate in the copolymer. The HPLC separation is correlated to theoretical predictions and to the glass transition temperatures of the samples, which show a broadening with increasing chemical heterogeneity.
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