Comprehensive phase behavior of poly(isoprene-b-styrene-b-ethylene oxide) triblock copolymers

Joon Chatterjee, Sumeet Jain, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

The phase behavior of 44 poly(isoprene-6-styrene-b-ethylene oxide) (ISO) linear triblock copolymer melts was investigated at weak to intermediate segregation strengths and spanning a comprehensive range of compositions. Phases were characterized by a combination of experimental techniques, including small-angle X-ray scattering, dynamic mechanical spectroscopy, transmission electron microscopy, and birefringence measurements. Combined with our previous results, six different stable ordered state symmetries have been identified: lamellae (LAM), Fddd orthorhombic network (O70), double gyroid (Q230), alternating gyroid (Q214), hexagonal (HEX), and body-centered cubic (BCC). The phase map of ISO specimens was found to be somewhat asymmetric around the fI = fO isopleth. This work provides a guide for theoretical studies and gives insight into the intricate effects of various parameters on the self-assembly of ABC triblock copolymers. Experimental SAXS data evaluated with a simple scattering intensity model show that local mixing varies continuously across the phase map between states of two- and three-domain segregation.

Original languageEnglish (US)
Pages (from-to)2882-2896
Number of pages15
JournalMacromolecules
Volume40
Issue number8
DOIs
StatePublished - Apr 17 2007

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