Architectural effect on the surface tension of an ABA triblock copolymer melt
Matsen, M. W. (2010) Architectural effect on the surface tension of an ABA triblock copolymer melt. Macromolecules, 43 (3). pp. 1671-1674. ISSN 0024-9297
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To link to this item DOI: 10.1021/ma902173w
The excess surface energy of lamellae formed by an ABA triblock copolymer melt oriented parallel to a neutral surface is evaluated using self-consistent field theory (SCFT). Consistent with experiments and previous SCFT calculations, we find a preference for the A-rich domains at the surface, which can only be attributed to the architectural asymmetry between the A and B blocks. The behavior was previously attributed to a loss of bridging configurations that occurs when the B-domain resides at the surface. Here we demonstrate that it is actually the presence of chain ends that reduces the excess surface energy of an A-rich domain relative that of a B-rich domain.