Polycarbonate-Polyester Blend Degradation Behavior

摘要

Objective of this paper is to document the efficacy of additives being used to minimize the antagonistic effects of ester interchange reactions that take place during high temperature processing of polycarbonate and polyester blends.Polycarbonate/polyester alloys suffer from loss of physical properties and moisture resistance due to ester interchange reactions.With right additives,the physical properties can be improved.Six different additives,that are phosphorous compounds and oxides of metals in nature were used to blend polycarbonate (PC) and polyesters.To improve the miscibility between the PC and polyethylene terephthalate (PET),a compatibilizer was added.Based on physical and analytical properties,certain additives have been identified as performing better than the rest.The properties selected to study are focused on understanding the impact of these additives on hydrolytic stability,tensile strength,heat deflection temperature,impact strength,and enthalpy and rate of crystallization.Degradation of physical properties and decrease in enthalpy of crystallization are indicative of loss of long term chain order and formation of unwanted copolymers in PC/Polyester blends.