Pressure and temperature effects in homopolymer blends and diblock copolymers

H. Frielinghaus, D. Schwahn, K. Mortensen, L. Willner, K. Almdal

    Research output: Contribution to journalConference articleResearchpeer-review


    Thermal composition fluctuations in homopolymer mer blends and diblock copolymers were studied with SANS in varying pressure and temperature fields. For homopolymers we find a quite consistent behavior: The dominating effect of compressibility or packing leads to a reduction of the entropic contribution of the Flory-Huggins parameter at larger pressure fields. This gives rise to a shift of the phase boundaries to higher temperatures and to a strong reduction of the Ginzburg parameter. Diblock copolymers show a different behavior. Neither the entropic term of the Flory-Huggins parameter nor the Ginzburg number seems to be related to the compressibility.
    Original languageEnglish
    JournalPhysica B: Condensed Matter
    Pages (from-to)260-262
    Publication statusPublished - 1997
    Event1st European Conference on Neutron Scattering - Interlaken, Switzerland
    Duration: 8 Oct 199611 Oct 1996


    Conference1st European Conference on Neutron Scattering


    • Small-angle neutron scattering
    • Polymer blends
    • Diblock copolymers

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