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The Role of the Order−Disorder Transition Temperature of Block Copolymer in the Compatibilization of Two Immiscible Homopolymers

The important role that the order−disorder transition temperature (TODT) of a block copolymer plays in the compatibilization of two immiscible homopolymers is demonstrated, using the model ternary blend systems consisting of a polystyrene-block-polybutadiene (SB diblock) copolymer and two immiscible homopolymers, polystyrene (hPS) and polyisoprene (hPI). For the study, SB diblock copolymers having different microstructures were employed. We investigated via transmission electron microscopy (TEM) the morphology of the blends. We found that an SB diblock copolymer was very poorly distributed at the interface between hPS and hPI in an hPS/hPI/SB ternary blend when the specimen was annealed at a temperature below the TODT of the block copolymer, while a more uniform distribution of the SB diblock copolymer was observed when a specimen was annealed at a temperature above its TODT. We have shown that the miscibility (or the interaction parameter) between the hPI and PB block in an SB diblock copolymer plays a d...