Abstract
The microstructure of extruded samples of block copolymer-homopolymer polystyrene blends has been studied using light microscopy and electron microscopy. For some compositions, the homopolymer polystyrene phase is in fibrillar form. These fibrils are dispersed throughout the block copolymer matrix with a surprisingly high degree of spatial ordering. Imbibition of a selective swelling agent results in anisotropic dimensional changes in the blends and these changes are fully consistent with the observed microstructure.
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