Using Mw dependence of surface dynamics of glassy polymers to probe the length scale of free surface mobility
Résumé
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.
Domaines
Matière Molle [cond-mat.soft] Science des matériaux [cond-mat.mtrl-sci] Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn] Dynamique des Fluides [physics.flu-dyn] Mécanique des solides [physics.class-ph] Mécanique des matériaux [physics.class-ph] Mécanique des fluides [physics.class-ph]
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Molecular_weight_dependent_levelling.pdf (3.97 Mo)
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Supporting Information.pdf (2.31 Mo)
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