Thermal Analysis pp 351-363 | Cite as
Thermal Analyses of Polymers. IX. First order Phenomena in Polystyrene
Abstract
Linear expansion and dilatometric measurements illustrate the occurrence of a first order transition following the normal Tg at 75°C. The first order transition for polystyrene depends upon its thermal history and the way in which the polymer is synthesized. First order transitions usually occur in the range 90° to 120°C, and the occurrence of this first order transition is independent of molecular weight and molecular weight distribution. Depolarized light measurements have been used to illustrate the changes in the first order phenomenon of polystyrene for several commercial samples as well as isothermal crystallization behavior. Annealing for even short times at 85°C changes the depolarized light trace to indicate the fusion of a second type of morphology.
Keywords
Molecular Weight Distribution Order Transition Linear Expansion Molecular Order Molecular Weight CharacteristicPreview
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References
- 1.R. F. Boyer, J. Polymer Eng. Sci., 8, 161 (1968); Rubber Chem. Tech., 36, 1303 (1963).CrossRefGoogle Scholar
- 2.B. Wunderlich, D. M. Bodily, and M. H. Kaplan, J. Appl. Phy., 35, 95 (1964).CrossRefGoogle Scholar
- 3.P. Meares, “Polymers: Structure and Bulk Properties,” Van Nostrand, New York,(1965),Chapter 10.Google Scholar
- 4.L. Nielsen, “Mechanical Properties of Polymers,” Reinhold, New York, (1962), Chapter 2.Google Scholar
- 5.G. W. Miller, TAP VII, J. Appl. Polymer Sci., in press.Google Scholar
- 6.T. M. Conner, J. Polymer Sci., (A2) 8, 191 (1970).CrossRefGoogle Scholar
- 7.G. W. Miller, unpublished data.Google Scholar
- 8.T. G. Fox & P. J. Flory, J. Appl. Phy., 21, 581 (1950).CrossRefGoogle Scholar
- 9.S. Newman and W. P. Cox, J. Polymer Sci., 46, 29 (1960).CrossRefGoogle Scholar
- 10.R. Boyer, J. Polymer Sci., C14, 267 (1966).Google Scholar
- 11.G. W. Miller, “Analytical Calorimetry,” II, R. S. Porter and J. F. Johnson, Eds., Plenum, New York, (1969), p. 397.Google Scholar
- 12.G. W. Miller, TAP VIII, J. Appl. Polymer Sci., in press.Google Scholar
- 13.G. W. Miller, J. Appl. Polymer Sci., 15, 39 (1971).CrossRefGoogle Scholar
- 14.J. J. Maurer, “Analytical Calorimetry,” I, J. F. Johnson and R. S. Porter, Eds/. Plenum, New York, (1969), p. 107.Google Scholar
- 15.J. J. Maurer, Polymer Preprints, A.C.S. Mtg., New York, (1969)ßp.640.Google Scholar
- 16.G. S. Y. Yeh, Amer. Phys. Soc. Mtg., Cleveland, March, III, (1971) p. 411.Google Scholar