Summary
Some binary polymer-diluent systems, previously studied by the Authors (SCANDOLA et al., 1982), showed an “unusual Tg-concentration dependence”. In order to investigate the relevance of the polymeric nature of the high-Tg component in determining this “anomaly”, two series of mixtures having the same diluent (di-n-Butylphthalate or Tricresylphosphate) and, as the high-Tg component, either a polymer (PVC) or a low-molecular weight substance (Phenolphthalein), have been examined. A discontinuity is found, as expected, in the “polymeric” systems PVC-di-n-Butylphthalate andPVC-Tricresylphosphate, as well as in Phenolphthalein-di-n-Butylphthalate mixtures where, however, the deviations from the calculated Tg-composition curve are much less marked. It is concluded that the presence of a polymer is not a necessary requirement for the occurrence of the above mentioned “anomaly”.
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Pizzoli, M., Scandola, M., Ceccorulli, G. et al. Comparative study of diluent effects on the glass transition of polyvinylchloride and phenolphthalein. Polymer Bulletin 9, 429–436 (1983). https://doi.org/10.1007/BF00265324
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DOI: https://doi.org/10.1007/BF00265324