Dynamics of end-grafted polystyrene brushes in theta solvents

Cong-Duan Vo, V. N. Michailidou, B. Loppinet, D. C. Vo, O. Prucker, J. Rühe, G. Fytas

    Research output: Contribution to journalArticlepeer-review


    The dynamics of the concentration fluctuations in end-grafted polystyrene brushes in a theta solvent (cyclohexane) are probed by evanescent wave dynamic light scattering at different wavevectors q and temperatures. When the solvent quality changes from marginal to poor, the relaxation function C(q, t) exhibits strong effects as compared with the smooth variation of the brush density profile. From a single exponential above 50 °C, C(q, t) becomes a two-step decay function. The fast decay is still assigned to the cooperative diffusion albeit slower than in the good solvent regime whereas the slow nonexponential and nondiffusive process might relate to microsegragated and/or chain dynamics in the present polydisperse brush. The relaxation function of the present three brushes with different grafting density reveals similarities and disparities between wet brushes and semidilute polymer solutions. © 2006 Wiley Periodicals, Inc.
    Original languageEnglish
    Pages (from-to)3590-3597
    Number of pages7
    JournalJournal of Polymer Science, Part B: Polymer Physics
    Issue number24
    Publication statusPublished - 15 Dec 2006


    • Cooperative diffusion
    • Evanescent wave dynamic light scattering
    • Polymer brushes
    • Theta solvent
    • Viscoelasticity


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