Evaluation of impact fracture toughness of PC/ ABS resin

摘要

Polycarbonate (PC) and acrylonitrile butadiene stylene copolymer (ABS) are known as materialshaving relatively high impact resistance. Recently, polymer alloy of these two materials has beendeveloped to attain higher impact resistance and has become to be used in various engineeringproducts. However, toughening mechanisms of PC/ABS alloy are not still understood very well. Inthis study, impact fracture toughness of PC/ABS alloy was evaluated for several weight fractions ofPC and ABS. Three-point bend specimens were fractured by a drop weight. The time variation of thedynamic stress intensity factor was evaluated and the critical value of the stress intensity at crackinitiation was determined. Fracture surfaces were also observed by SEM. The higher fracturetoughness has been obtained for the case that the ABS particles are distributed in PC matrix. ABSparticles would play a similar role as the butadiene particles in ABS resin during fracture process, i. e.,reduction of the stress triaxiality due to the formation of the voids.