Distribution of Matrix Homopolymer in Block Copolymers of Spherical Morphology

摘要

Samples made by blending deuterated polystyrene Sd of three different molecular weights with a polystyrene-polybutadiene block copolymer SB were studied with small-angle scattering techniques using X-rays (SAXS) and neutrons (SANS). The SANS results were sensitive both to the amount of added homopolymer Sd and to its chain length. Anomalously high SANS intensities and the absence of an intraparticle scattering maximum are consistent with the exclusion of added Sd from the corona of the SB micelles, resulting in Sd enrichment of the interstitial regions. Keywords: Block copolymers, Polymer chain configuration.