Microphase separation of a symmetric poly(styrene-B-paramethylstyrene) diblock copolymer

V.T. Bartels, V. Abetz, K. Mortensen, M. Stamm

    Research output: Contribution to journalJournal articleResearchpeer-review


    The microphase separation in a symmetric diblock copolymer consisting of polystyrene and polyparamethylstyrene has been studied by small-angle neutron scattering. The observed peak changes with temperature in intensity, shape and position. The peak position shifts at the microphase separation transition temperature T(MST) by approximately 7%. Also from a peak intensity analysis we determine T(MST) at approximately 180-degrees-C. The shape of the peak change at T(MST) and the indication of a second-order peak is observed, characteristic of a lamellar phase in the ordered regime. Intensity does not vanish for q --> 0, but has a temperature-dependent level. Results are discussed with respect to recent computer simulations and theoretical approaches. A simple mean-field picture is not consistent with the data.
    Original languageEnglish
    Pages (from-to)371-376
    Publication statusPublished - 1994

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