Abstract

A new morphology is observed in a blend of a symmetrical (lamellar) styrene-butadiene diblock copolymer and a styrene homopolymer, in which the two blocks and the homopolymer all have approximately the same molecular weight of 25000. This morphology is associated to the catenoid-lamellar (CL) structure recently discussed in the literature. The CL phase contains lamellae where the layers of component A are penetrated by channels of component B, and the shape of the interphase dividing-surface resembles a minimal surface based on revolution of a catenary about the central axis of the channel

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