Critical neutron scattering in a polymer blend above and below the critical point of demixing: Critical exponents and amplitude ratios

D. Schwahn, K. Mortensen, S. Janssen

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The critical behavior of a polymer blend was measured by small-angle neutron scattering above and below the critical temperature T-c, i.e., outside and inside the unstable region. The critical exponents and the amplitudes of the susceptibility and the correlation length were determined. For T > T-c the critical exponents gamma and nu are consistent with the renormalization-group predictions. Below T-c, however, deviations from the expected values were observed. Also experimental critical amplitude ratios (20-30)% smaller than predicted were found.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume73
    Issue number10
    Pages (from-to)1452-1455
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1994

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