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The kinetics of surface craze growth in polycarbonate exposed to normal hydrocarbons

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Abstract

A variable radius of curvature strain bending apparatus has been used to investigate the propagation of surface crazes in polycarbonate exposed to a series of normal hydrocarbons fromn-hexane ton-dodecane. In all cases it was found that for crazes growing in a zone free of other crazes, the growth rate was linear at constant temperature, and exponentially dependent upon temperature. An activated-state theory was developed to describe the kinetics of growth in terms of two parameters,B, a dimensionless strain constant which was independent of both the test variables and the crazing agent used, andA′ a characteristic growth rate parameter that varied exponentially with temperature whereA′=G0 exp —ΔE G/RT. The rate constantG 0 and the activation energy ΔE G correlate with the square of the difference between the solubility parameters of the crazing agent and polycarbonate.

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Authors and Affiliations

  1. Institute of Materials Science, The University of Connecticut, 06268, Storrs, Connecticut, USA

    A. Priori, L. Nicolais & A. T. Dibenedetto

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  1. A. Priori
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  2. L. Nicolais
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  3. A. T. Dibenedetto
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On leave from Institute di Principi di Ingegneria Chimica, Universita di Napoli, 80125 Napoli, Italia.

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Priori, A., Nicolais, L. & Dibenedetto, A.T. The kinetics of surface craze growth in polycarbonate exposed to normal hydrocarbons. J Mater Sci 18, 1466–1472 (1983). https://doi.org/10.1007/BF01111966

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  • DOI: https://doi.org/10.1007/BF01111966

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