High-pressure autoclave curing for a thermoset composite : effect on the glass transition temperature

• Published in: Journal of materials science Vol. 29; no. 22; pp. 5985 - 5989
• Main Authors: BOEY, F. Y. C, LEE, T. H, SULLIVAN, P. L
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 15-11-1994
• Subjects: Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Polymer industry, paints, wood; Technology of polymers; Curing(plastics); Glass transition temperature; Composite material; Thermosetting resin; Fiber reinforced material; High pressure
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF00366883

The effect of high-pressure curing within an autoclave on the cured glass transition temperature (Tg) of a thermoset fiber-reinforced composite has been studied. The results indicate that an increase in the Tg value was obtained by a higher curing pressure as well as a lower moisture content. Both results have been related to the reduction in the microscopic free volume and the macroscopic void content of the matrix resin. Using the results obtained, the Tg increase was related to the applied autoclave pressure through equations based on both free-volume and thermodynamic concepts, with the results indicating a significantly higher effect than for homogeneous polymers. This has been attributed to a moisture-dominant diffusion process which has been used to explain the growth and reduction of voids. (Author)