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The effect of thermal pretreatment on the strength of polycarbonate
Author(s) -
Golden J. H.,
Hammant B. L.,
Hazell E. A.
Publication year - 1967
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1967.070110818
Subject(s) - polycarbonate , glass transition , materials science , ultimate tensile strength , flexural strength , composite material , amorphous solid , izod impact strength test , polymer , chemistry , organic chemistry
Abstract 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.