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Simha and Wilson

Figure 2.1. Frozen fraction of free volume vs. glass transition temperature. Full triangles — values for different polymers at ambient pressures [Simha and Wilson, 1973], Squares — PS data at pressures P = 0 - 400 MPa (data [Rehage, 1980] calculations [Utracki and Simha, 1997]). Figure 2.1. Frozen fraction of free volume vs. glass transition temperature. Full triangles — values for different polymers at ambient pressures [Simha and Wilson, 1973], Squares — PS data at pressures P = 0 - 400 MPa (data [Rehage, 1980] calculations [Utracki and Simha, 1997]).
Experimental data from our laboratories will be shown for an extensive series of amorphous polymers with glass transitions between Tg = 200 and 500 K. We discuss the temperature dependence of the hole-size distribution characterized by its mean and width and compare these dependencies with the hole fraction calculated from the equation of state of the Simha-Somcynsky lattice-hole theory from pressure-volume-temperature PVT) experiments [Simha and Somcynsky, 1969 Simha and Wilson, 1973 Robertson, 1992 Utracki and Simha, 2001]. The same is done for the pressure dependence of the hole free-volume. The free-volume recovery in densified, and gas-exposed polymers are discussed briefly. It is shown that the holes detected by the o-Ps probe can be considered as multivacancies of the S-S lattice. This gives us a chance to estimate reasonable values for the o-Ps hole density. Reasons for its... [Pg.422]

G.S.Y. Yeh (University of Michigan, Ann Arbor, Michigan) In answer to Dr. Sanderson about all the Tji data coming from flow, there are some that don t, for example the specific volume measurements by Simha and Wilson and the d-spacing studies by Krimm. ... [Pg.438]

Simha, R., and Wilson, R. S., Thermal expansion of amorphous polymers at atmospheric pressure II. Theoretical considerations. Macromolecules, 6 (6), 908-914 (1973). [Pg.278]

Simha, R., Wilson, R. S., and Olabisi, O., Rressure-volume-temperature properties of amorphous polymers empirical and theoretical predictions, Kolloid Z. Z Polym., 251, 402-408 (1973). [Pg.278]

Quach, A. Wilson, P. S. Simha, R., "The Effects of Stereoregularity on the Pressure-Volume-Temperature and Related Properties of Poly(methyl methacrylate)," J. Macromol. Sci., Phys., B9, 533 (1974). [Pg.178]

Quach, A., Wilson, P. S., Simha, R., The effects of stereoregularity on the pressure-volume-temperature and related properties of poly(methyl methacrylate). Journal of Macromolecular Science, Part B, 9(3) pp. 533-550 (1974). [Pg.744]


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See also in sourсe #XX -- [ Pg.262 , Pg.404 , Pg.405 , Pg.478 , Pg.479 ]




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