AN OUT OF AUTOCLAVE TOUGHENED EPOXY PREPREG SYSTEM CURABLE AT DIFFERENT CURING TEMPERATURES

摘要

An out of autoclave (OOA) processible toughened epoxy prepreg system showed very similar overall high mechanical properties with different curing temperatures, at 275°F (135°C), 300°F (150°C) and 356°F (180°C). These mechanical properties include CAI, GiC, G_2C, OHC and OHT values. The system was also found to generate very mild exothermic heat under a simple one step dwell processing procedure. Thick laminates of up to 800 plies, about 4", were made without any ill effect and with very minimum void content. It has great moisture resistance and absorbs under 0.8% of moisture after 2 weeks at 72°C (160°F) water bath. The hot/wet property retention is excellent. The applications for this toughened prepreg system include primary structural parts in space and aerospace areas.