Molecular weight scaling in critical polymer mixtures

M.D. Gehlsen, J.R. Rosedale, F.S. Bates, G.D. Wignall, L. Hansen, K. Almdal

    Research output: Contribution to journalJournal articleResearchpeer-review


    Symmetric binary mixtures of partially deuterated polymers were prepared at the critical composition. The segment-segment interaction energy parameter chi(eff) was varied by adjusting the difference in deuterium content DELTA-X(D) between species. Chi(eff) was measured as a function of temperature, DELTA-X(D), and molecular weight by small-angle neutron scattering. The critical point for demixing was determined to scale as chi(eff,c) is similar to N(-delta) with delta = 1.01 +/- 0.05, where N is the degree of polymerization. This result confirms the mean-field prediction of Flory and Huggins.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number16
    Pages (from-to)2452-2455
    Publication statusPublished - 1992


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