Miscible blends of polystyrene and poly(epsilon-caprolactone) with phenylacetylene carbon monoxide alternating copolymer

The alternating copolymer of phenylacetylene (PA) and carbon monoxide (GO) (poly(PA-alt-CO)) synthesized by palladium complex has been blended with polystyrene (PS) and poly(epsilon-caprolactone) (PCL). The miscibility of the blends was investigated by differential scanning calorimetry (DSC). A single T-g was observed over the entire composition range for both blending systems, indicating that PS and PCL were miscible with poly(PA-alt-CO). The effect of blending with poly(PA-alt-CO) on the crystallization behavior of PCL was also studied. Both the degree of crystallinity and the crystallization rate of PCL were found to be depressed with the presence of copolymer. Blending with poly(PA-alt-CO) also exerted a strong effect on the melting behavior of PCL. The recrystallization of PCL in the melting region was hindered by poly(PA-alt-CO).