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Further evidence of an unusual Tg-concentration dependence for plasticized polyvinylchloride

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Summary

The glass transition temperature-composition dependence for the systems PVC-dimethylphthalate and PVC-di-n-propylphthalate has been determined in the whole range of concentration. The glass transition temperature of the mixtures decreases with increasing diluent content and in both cases shows a discontinuity at a critical composition (w1≃0.4). At diluent weight fractions lower than 0.4, the theoretical equations by Kelley-Bueche and CouchmanKarasz satisfactorily fit the experimental results. The marked changes in the glass transition parameters (Tg, Δcp, width of the transition) which occur in the intermediate range of concentration (0.4<w1<0.6), although difficult to visualize in physical terms, indicate an enhanced mobility of the relaxing units. Moreover, the properties of the mixtures in the high diluent concentration range seem to be dictated by the properties of the pure diluent.

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Authors and Affiliations

  1. Centro di Studio per la Fisica delle Macromolecole del C.N.R., Istituto Chimico „G. Ciamician”, Bologna University, Via Selmi 2, I-40126, Bologna, Italy

    M. Scandola, G. Ceccorulli, M. Pizzoli & G. Pezzin

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  1. M. Scandola
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  2. G. Ceccorulli
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  3. M. Pizzoli
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  4. G. Pezzin
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Scandola, M., Ceccorulli, G., Pizzoli, M. et al. Further evidence of an unusual Tg-concentration dependence for plasticized polyvinylchloride. Polymer Bulletin 6, 653–660 (1982). https://doi.org/10.1007/BF00255169

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  • DOI: https://doi.org/10.1007/BF00255169

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