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The Volumetric Response of Polymeric Glasses to Complex Thermomechanical Histories: a Critical Evaluation of the Kahr Model

Published online by Cambridge University Press:  16 February 2011

J. Greener ,
J. M. O'reilly  and
K. C. Ng
J. Greener
Affiliation:
Research Laboratories, Eastman Kodak Company, Rochester, NY 14650-2104.
J. M. O'reilly
Affiliation:
Research Laboratories, Eastman Kodak Company, Rochester, NY 14650-2104.
K. C. Ng
Affiliation:
Research Laboratories, Eastman Kodak Company, Rochester, NY 14650-2104.
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Abstract

The KAHR model was used to predict the transient volumetric response of poly(vinyl acetate) (PVAc) and polystyrene (PS) glasses in various experiments involving controlled variations of temperature and pressure in the vicinity of the glass transition. The experiments considered include contraction following a quench from equilibrium, expansion after a temperature “jump,” and pressure-induced densification. The model parameters of PVAc were obtained by fitting experimental data via a 4-parameter Levenberg-Marquardt optimization. The optimized parameters were then used to predict the response of the material in three different experiments. The response of PS in a pressure densification experiment was also analyzed and compared with existing data. Generally, the predicted response of PVAc in the various temperature jump experiments is in excellent agreement with observation. The prediction of the response of PS in the pressure densification experiment is also in line with observation although the data for this case is limited and the results are still inconclusive.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 99
Copyright
Copyright © Materials Research Society 1991

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