بهينه سازي پخت زرين هاي فتولي تقويت شده با الياف پنبه سوز

Phenolic resins arc very well known for their high temperature and chemical resistance and good electrical properties. These thermoset resins are being used for a long time as friction materials, ablatives, decorative laminates and special domestic applications. The curing process of these resins, because of the required high temperature and pressure, is very complicated. The curing reaction mechanism of phenolic resins is a condensation type of reaction producing gaseous water or ammonia. The curing condition of this system is very important in order to eliminate any voids and achieve good mechanical properties. In this paper a preliminary curing cycle has been considered for a phenolic asbestos composite based on DSC thermograph of the resin. The effect of pressure, temperature and curing time on mechanical properties of this composite have been experimentally investigated. The optimized condition for achieving the highest mechanical properties has been determined. The results show that the optimum curing condition corresponds to 160°C, 60 bar pressure and 60 minutes for reaction time.