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Viscoelastic properties of glass-forming polymers

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Abstract

The effects of time, temperature, physical ageing, and non-linear stresses on the viscoelastic properties of glass-forming polymers are analysed by using our molecular theory of glasses. The drastic slowing down of the relaxation processes from the liquid state to the glassy state can be explained in terms of the temperature-dependent physical ageing rate. We find that the loss tangent decreases with ageing time whose effect, however, diminishes at longer loading times. In the non-linear viscoelastic range, the theory also predicts that the stress relaxes faster in shear than in tension.

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  1. Xerox Corporation, Webster Research Center, 800 Phillips Road, Webster, New York, 0114-39D, 14580, USA

    T. S. Chow

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  1. T. S. Chow
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Chow, T.S. Viscoelastic properties of glass-forming polymers. J Mater Sci 25, 957–960 (1990). https://doi.org/10.1007/BF03372185

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