Critical crossover phenomena in compatible polymer blends studied with SANS

D. Schwahn, S. Janssen, L. Willner, T. Schmackers, T. Springer, K. Mortensen, H. Takeno, H. Hasegawa, H. Jinnai, T. Hashimoto, M. Imai

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Polymer blends show a much larger 3d-Ising regime, e.g. a much larger Ginzburg number Gi than predicted by the Ginzburg criterion. This discrepancy is supposed to be explained by the compressibility or the free volume of the blend. In this paper we present and discuss the Gi number of polymer blends, different in chemistry, molecular weight, and microstructure. One sample was also studied at a different pressure. Gi was determined by describing the susceptibility obtained from SANS with the crossover function from Belyakov et al. The essential results are that Gi depends sensitively on monomeric microstructure and on pressure. This clearly shows that Gi is not a universal function. The observed strong decrease of Gi with pressure is a clear experimental proof that the critical crossover behaviour in polymer blends is indeed strongly influenced by the compressibility or free volume of the blend.
    Original languageEnglish
    JournalPhysica B: Condensed Matter
    Volume213
    Pages (from-to)685-687
    ISSN0921-4526
    DOIs
    Publication statusPublished - Aug 1995
    Event Yamada Conference XXXXI/ International conference on neutron scattering - Sendai, Japan
    Duration: 10 Oct 199413 Oct 1994
    Conference number: 41

    Conference

    Conference Yamada Conference XXXXI/ International conference on neutron scattering
    Number41
    CountryJapan
    CitySendai
    Period10/10/199413/10/1994
    SponsorYamada Science Foundation

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