Abstract
The distribution of a diblock copolymer within a high molecular weight homopolymer matrix phase was determined quantitatively by forward recoil spectrometry. Cross-sectional TEM showed that excess copolymer segregation to the homopolymer/homopolymer and homopolymer/vacuum interfaces was due the preferential segregation of block copolymer micelles to these interfaces. It is argued that the segregation of block copolymer micelles is a manifestation of attractive interactions between polymer brushes, and between polymer brushes and a free surface, which are important in high molecular weight homopolymer matrices
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