Abstract
Dielectric and thermal behavior of toluene solutions of an isotactic-rich. and a syndiotactic-rich poly(methyl methacrylate) have been investigated over wide ranges of concentration and temperature to examine the effect of stereoregularity. Three dielectric relaxations designated as α, β, and γ were observed in both systems. These processes can be assigned, respectively, to the process due to segmental motion of the polymer chains, rotation of toluene molecules, and secondary motion of toluene coupled with those of the polymer. For both systems, plots of loss maximum frequency versus reciprocal temperature for the α process conform to the Vogel–Tamman equation. The Vogel–Tamman parameter B for solutions of the syndiotactic polymer is larger than that for the isotactic polymer, while the other two parameters A and T0 are nearly independent of stereoregularity. Differential thermal analysis curves for solutions with low to medium concentrations each exhibits a two-step change, which can be assigned to the two glass. transitions, TgI and TgII. The TgI for the solutions of the syndiotactic polymer is higher than that of the isotactic polymer, while the TgII is the same for both polymers.
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Adachi, K., Kotaka, T. Effect of Diluent on Molecular Motion and Glass Transition in Polymers. V. The System Poly(methyl methacrylate)/Toluene. Polym J 13, 687–692 (1981). https://doi.org/10.1295/polymj.13.687
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DOI: https://doi.org/10.1295/polymj.13.687