Isotropic Lifshitz behavior in block copolymer-homopolymer blends

Frank S. Bates, Wayne Maurer, Timothy P. Lodge, Mark F. Schulz, Mark W. Matsen, Kristoffer Almdal, Kell Mortensen

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

A series of mixtures composed of a symmetric A-B diblock copolymer and a symmetric blend of A and B homopolymers was investigated by small-angle neutron scattering. Mean-field theory predicts that a line of lamellar-disorder transitions with wave-vector instability q*>0 will meet a line of critical points with q*=0 in the three-component mixture at an isotropic Lifshitz point. Mean-field Lifshitz behavior (=1 and =14) was observed in the disordered state at the anticipated composition to within 1 K of the phase transition.

Original languageEnglish (US)
Pages (from-to)4429-4432
Number of pages4
JournalPhysical Review Letters
Volume75
Issue number24
DOIs
StatePublished - Jan 1 1995

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