Investigation on the Influence of Different Compatibilizers on Polycarbonate and High Density Polyethylene Blends: Mechanical Properties, Thermal Properties, Morphology, and Chemical Resistance

This investigation focused on a systematic approach of selecting the best possible polycarbonate/high density polyethylene (PC/HDPE) blend ratio and a suitable compatibilizer to improve the notch sensitivity, craze, and cracking tendency of PC. Among five different compatibilizers, polyethylene glycol (PEG) was found to be more effective based on mechanical performance and changes in phase morphology. The phase morphology of dispersed HDPE phase changed from elongated domain to fine spherical domain, and the tensile modulus and heat distortion temperature of PC/HDPE blend increased with increase in PEG content. DSC analysis showed an inward shift in the glass transition temperature (T-g), indicating enhanced compatibility between the PC and HDPE phases. Furthermore, PEG compatibilized PC/HDPE (80/20) blend was found to have very good notch performance and chemical resistance compared to PC. Hence, this blend can be used to design products with intricate shapes with less notch sensitivity and high chemical resistance with the superior mechanical performance of PC.