Nonequilibrium polymer chains induced by conformational transitions in densely interfacial layers

Peng Wei Zhu

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Nonequilibrium poly(N-isopropylacrylamide) (PNIPAM) chains are generated by temperature-induced conformational transitions in the densely interfacial PNIPAM layer at high adsorbed amounts in aqueous solution. The interleaving chains relax in a spatially heterogeneous space of adsorbed layer which is filled with the domains via the hydrogen bonding and hydrophobic interactions. The relaxation dynamics of interleaving chains is changed from the weekly stretched exponential behaviour at the lower adsorbed amount to the strongly stretched exponential behaviour at the higher adsorbed amount. The kinetic constraints for the relaxation dynamics depend on the segment density of the adsorbed layer which is controlled by the temperature. The stretched exponential relaxation is related to an ensemble of relaxations confined in the domains with different physical origins for the heterogeneous dynamics. The range of energy barriers for the relaxation is estimated from the stretched exponent based on the random first order transition theory.
    Original languageEnglish
    Pages (from-to)1 - 8
    Number of pages8
    JournalJournal of Chemical Physics
    Volume137
    Issue number10
    DOIs
    Publication statusPublished - 2012

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