SCFT study of nonfrustrated ABC triblock copolymer melts

Christopher A. Tyler; Jian Qin; Frank S. Bates; David C. Morse

doi:10.1021/ma062778w

SCFT study of nonfrustrated ABC triblock copolymer melts

Christopher A. Tyler, Jian Qin, Frank S. Bates, David C. Morse

Chemical Engineering and Materials Science

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168 Scopus citations

Abstract

The phase behavior of ABC triblock copolymer melts is studied by self-consistent-field theory (SCFT). We focus on "nonfrustrated" triblocks, in which the Flory - Muggins interaction parameter X_AC between the end blocks is significantly larger than that between the middle and either end block, i.e., X_AC > X_AB ∼ X _BC-Such systems tend to form ordered structures with no AC interface. Complete phase triangles at fixed values of the products X_ijN are presented for a model with X_AB = X_BC < X_AC and for a model with parameters chosen to represent poly(isoprene-b-styrene-b- ethylene oxide) copolymers that have recently been studied experimentally. Particular attention is paid to the structure of the orthorhombic O⁷⁰ network phase and the reasons for its existence as well as to the sensitivity of the predicted phase behavior to changes in the X parameters.

Original language	English (US)
Pages (from-to)	4654-4668
Number of pages	15
Journal	Macromolecules
Volume	40
Issue number	13
DOIs	https://doi.org/10.1021/ma062778w
State	Published - Jun 26 2007

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AU - Qin, Jian

AU - Bates, Frank S.

AU - Morse, David C.

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SCFT study of nonfrustrated ABC triblock copolymer melts

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