Complex phase behavior in solvent-free nonionic surfactants

M.A. Hillmyer, F.S. Bates, K. Almdal, K. Mortensen, A.J. Ryan, J.P.A. Fairclough

    Research output: Contribution to journalJournal articleResearch


    Unsolvated block copolymers and surfactant solutions are ''soft materials'' that share a common set of ordered microstructures, A set of polyethyleneoxide-polyethylethylene (PEG-PEE) block copolymers that are chemically similar to the well-known alkane-oxyethylene (C(n)EO(m)) nonionic surfactants was synthesized here. The general phase behavior in these materials resembles that of both higher molecular weight block copolymers and lower molecular weight nonionic surfactant solutions. Two of the block copolymers exhibited thermally induced order-order transitions and were studied in detail by small-angle scattering, The fundamental microstructural spacing was determined to be a crucial parameter in these transitions. Transitions from one ordered state to another occur only when the lattice spacing is nearly matched, These materials highlight the importance of epitaxy and molecular conformation in the phase transformations of soft material.
    Original languageEnglish
    Issue number5251
    Pages (from-to)976-978
    Publication statusPublished - 1996


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