SCFT study of nonfrustrated ABC triblock copolymer melts

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

Research output: Contribution to journalArticlepeer-review

135 Scopus citations


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 XAC between the end blocks is significantly larger than that between the middle and either end block, i.e., XAC > XAB ∼ X BC-Such systems tend to form ordered structures with no AC interface. Complete phase triangles at fixed values of the products XijN are presented for a model with XAB = XBC < XAC 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 languageEnglish (US)
Pages (from-to)4654-4668
Number of pages15
Issue number13
StatePublished - Jun 26 2007


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