Processing Temperature Effects on Thermal and Mechanical Properties of The High Speed Impact Resistant Thermoplastic Composites

摘要

The effect of processing temperatures of Kevlar®-KM2 fabric reinforced composites with polysulfone (PSU) resin system was examined by means of correlating the thermal properties and the mechanical as well as high speed impact properties. The composite processing temperature significantly influenced the morphology of the PSU. High processing temperature behaves similarly to the slow cooling process and low processing temperature exhibits similar to the fast cooling process. As the processing temperature increases or as the cooling rate slows down, T_g and stiffness of the composites increased. Thermal effusivity, which is the square root of the product of density, thermal conductivity and heat capacity was also well correlated with thermal as well as mechanical properties. As increasing the processing temperature, the thermal effusivity of both resin and composites increases due to the changes in morphology of resin as well as changes in physical characteristics of the composites during the fabrication process. High speed impact resistance of the composites was inversely proportional to the stiffness, which is largely due to the thermal history of the resin and the wetting characteristics of the composites.