Abstract
Thermal behaviors of syndiotactic polystyrene (SPS) gels in SPS–xylene isomer system were investigated to get information on the isomer effect of xylene on ability of complex formation with SPS. The melting temperature of the crystalline complex of p-xylene with SPS in SPS p-xylene system was higher than that in SPS–m-xylene system. The weight of the gel sample in each thermogravimetric curve decreased by two step in both systems. This might suggest that there were two spaces in which xylene molecules could be located. The weight of p-xylene in the second step decreased more largely and at higher temperature than that of m-xylene. We could conclude that p-xylene exhibited higher ability of complex formation with SPS than m-xylene from thermal analyses. Infrared results on the process of gelation showed that the content of TTGG conformation was larger and the completion of gelation was faster in SPS–p-xylene system. The difference of sorption behaviors at 25°C of the annealed atactic polystyrene film were not observed between xylene isomers, but the p- and m-xylene sorption isotherms of the annealed SPS film showed sigmoid-type isotherms and were different between xylene isomers. Sorption amount of p-xylene was larger than that of m-xylene at low activity, but smaller at high activity, which resulted in the preferential sorption of p-xylene into a mesophase at low activity and the decrease of an amorphous part by complex formation of p-xylene with SPS at high activity.
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Tsutsui, K., Katsumata, T., Fukatsu, H. et al. The Isomer Effect on Complex Formation in Syndiotactic Polystyrene–Xylene System. Polym J 31, 268–273 (1999). https://doi.org/10.1295/polymj.31.268
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DOI: https://doi.org/10.1295/polymj.31.268