Use of Block Copolymer as Polymer Blend Compatibilizer.

摘要

Mechanical properties of polymer blends can be improved by addition of block copolymers as compatibilizers. The objective of this study has been to systematically investigate the effect of added block copolymer in order to gain understanding of the factors, such as the amount, size and structure of block copolymer, that control the efficacy of the compatibilization. The rate of particle coarsening that occur at the late stage of phase separation has been shown to be affected sensitively by the presence of even a very small amount of block copolymer. On the assumption that the late stage proceeds by the Lipshitz-Slyozov mechanism, one can estimate the change in the interfacial tension resulting from the adsorption of block copolymer at the interface. The larger the block copolymer size is, the more pronounced is the reduction in the particle coarsening rate. When polymers are melt-blended, a larger block copolymer additive is again found to be more effective than smaller copolymers.... Polymer blends, Compatibilizer, Interfacial tension, Block copolymer.