The effect of thermal pretreatment on the strength of polycarbonate
Article first published online: 9 MAR 2003
Copyright © 1967 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 11, Issue 8, pages 1571–1579, August 1967
How to Cite
Golden, J. H., Hammant, B. L. and Hazell, E. A. (1967), The effect of thermal pretreatment on the strength of polycarbonate. J. Appl. Polym. Sci., 11: 1571–1579. doi: 10.1002/app.1967.070110818
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 20 JAN 1967
The effect of preheat treatment at temperatures below the glass transition for various periods of time on selected properties of molded polycarbonate has been studied. Changes in tensile and flexural strength as functions of time and preheat temperature (80–140°C.) were determined and these are discussed in relation to changes in the nature of the β-transition region and the influence of the glass transition region. It is suggested that the preheat treatment produces a greater degree of order within the amorphous region of the polymer, resulting in an increase in strength at temperatures up to 132°C. The strength of the polycarbonate before and after heat treatment appears to be independent of the presence of the equilibrium water content.