Abstract
The gelation of PαMS/CS2 solution was investigated to compare with atactic-(at-) and isotactic-(iso-)polystyrene (PS)/CS2 systems. Gel melting temperature of poly(α-methyl)styrene (PαMS)/CS2 was much higher than that of at-PS/CS2 gels at the same polymer concentration and molecular weight. This implies that the chemical structure of the chains, in particular the side group of the chain, has significant influence on the gelation. The mixtures of at-PS/PαMS/CS2 and at-PS/iso-PS/CS2 also can form thermo-reversible gels on cooling. The melting temperature of at-PS/PαMS/CS2 gels shifts to higher temperature with increasing weight fraction of PαMS. In contrast, no obvious change was observed in the melting temperature of at-PS/iso-PS/CS2 gels with variation in mixture components. These results suggest that not crystallization, but chemical structure and interactions due to the side groups have more important roles for the gelation of PS/CS2 solution. Enthalpy change of the network junction points of PαMS/CS2 gels was determined to be higher than that of at-PS/CS2 and iso-PS/CS2 gels, suggesting that there is the stronger junction point for PαMS/CS2 gels than at-PS/CS2 gels.
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Xie, XM., Tanioka, A. & Miyasaka, K. Thermoreversible Gelation Mechanism of Polystyrene/CS2 Solutions. Polym J 30, 435–438 (1998). https://doi.org/10.1295/polymj.30.435
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DOI: https://doi.org/10.1295/polymj.30.435