Quantitative Evaluation of the Gibbs-Dimarzio Theory of the Glass Transition for Polystyrene
The applicability of the Gibbs-DiMarzio (G-DM) theory of the glass transition (Tg) is quantitatively evaluated for polystyrene (PS). The analysis was conducted under the assumption that both the inter- intramolecular energy ratio (r) and the effective chain segment density (n) remain constant while the fractional free volume at Tg(Vo) varies as a function of the reciprocal degree of polymerization (103/P). Based upon reduced parametric plots of Tg/Tg∞ versus 103/P, the results showed that the G-DM equations were satisfactory for PS; when 0.015 ≦ Vo ≦ 0.045, optimum agreement occurred at n = 1.80, r = 1.05.
KeywordsPolystyrene Vinyl Calorimetry PMMA Boulder
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- 8.A. R. Greenberg and R. P. Kusy, Polymerin pressGoogle Scholar
- 9.R. P. Kusy and A. R. Greenberg, Polymer, accepted for publication.Google Scholar
- 10.RR. Sokal and F. J. Rohlf, in “Biometry”, WH. Freeman, Ch. 7, 13 and 14 (1969).Google Scholar
- 11.J. Neter and W. Wasserman, “Applied Linear Statistical Models,” R. D. Irwin, Inc., Homewood, Illinois, Ch. 5 (1974).Google Scholar
- 12.J. B. Enns, R. R. Boyer and J. K. Gillham, Polym Preprints18(2):475 (1977).Google Scholar
- 14.C. A. Glandt, H. K. Toh, J. K. Gillman and R. F. Boyer,Polym. Preprints, 16 (2): 126 (1975).Google Scholar
- 15.S. Krause and M. Iskander, Proc. 10th N. Amer. Therm. Anal. Conf, Boston, 51 (1980).Google Scholar
- 18.S. J. Stadnicki, J. K. Gillham, and R. F. Boyer, Polym. Preprints, 16 (1): 559 (1975).Google Scholar
- 19.K. Ueberreiter and G. Kanig, Z. Naturforsch., 6A: 551 (1951).Google Scholar