MECHANICAL-PROPERTIES OF POLYCARBONATE-POLYSULFONE AND POLYCARBONATE-POLYETHERIMIDE BLENDS

Five, ten, and twenty percent by weight blends of polysulfone in polyc arbonate and polyetherimide in polycarbonate were produced by melt ble nding. The materials were injection molded into plaques. Mechanical an alysis consisting of tensile, pendulum impact, and ballistic impact te sting was conducted using the plaques or samples machined from the pla ques. The average impact strength and percentage of ductile failures d ecreased with increasing composition of polysulfone and polyetherimide . The tensile test results indicate that a relationship exists between the percent composition and the yield strength for the blends with th e blends showing an improvement in tensile strength. The ballistic tes ting results show that a possibly linear relationship exists between t he percent composition and the critical velocity for complete penetrat ion. Differential scanning calorimetry was conducted to measure the gl ass transition temperatures of the materials. The presence of two glas s transition temperatures and lack of transparency have indicated that the blends are immiscible. (C) 1995 John Wiley and Sons, Inc.