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Deformation in glassy polymers

✍ Scribed by M. Song; D. J. Hourston; H. M. Pollock

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 414 KB
Volume: 59
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960103)59:1<173::aid-app22>3.0.co;2-#

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✦ Synopsis

On the basis of known nonlinearity of intermolecular force fields, we discuss the interpretation of PVT (pressure, volume, and temperature) behavior, pressure-temperature superposition for polymers, and the relationship between yield stress and tensile modulus. For PVT behavior of polymers, our theoretical results coincide with the experimental data, and their response to pressure is universal. The maximum theoretical yield strain, cy, for glassy polymers is 1.08, and this value is beyond the elastic limit for glassy polymers. The previously established empirical relationship between yield stress, cry, and tensile modulus, E: a , = 0.028 E , which again, is universal for glassy polymers, is predicted also by our phenomenological model. The theoretically predicted values of yield stress for glassy polymers range from 24 MPa to 84 MPa, coinciding with published experimental results. We discuss how the phenomenological model is helpful in the understanding of nonlinear viscoelasticity of glassy polymers 0 1996 John Wiley & Sons, Inc.

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