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Using Mw dependence of surface dynamics of glassy polymers to probe the length scale of free surface mobility

Abstract : We describe a series of surface levelling experiments in glassy polystyrene (PS) of varying molecular weight. The evolution through a mobile surface layer is described by the glassy thin film equation that was introduced and used in a previous work. Excellent agreement with the data is achieved, with surface mobility as the single free parameter. Different molecular-weight dependencies in mobility are then observed above and below the glass transition. The results are discussed in terms of surface-chain anchoring in the bulk matrix, and the length scale for surface mobility.
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https://hal.archives-ouvertes.fr/hal-02271644
Contributor : Thomas Salez <>
Submitted on : Wednesday, February 19, 2020 - 10:46:35 AM
Last modification on : Thursday, February 20, 2020 - 4:55:51 PM

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  • HAL Id : hal-02271644, version 2
  • ARXIV : 1909.01835

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Yu Chai, Thomas Salez, James Forrest. Using Mw dependence of surface dynamics of glassy polymers to probe the length scale of free surface mobility. Macromolecules, American Chemical Society, 2020, 53 (3), pp.1084. ⟨hal-02271644v2⟩

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