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- W4313366955 endingPage "566" @default.
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- W4313366955 abstract "Surface glass-transition temperature (Tgsurf) and transition width (W) within 1 nm of the surface were measured by monitoring a qualitative change in the contact angle or density of end-groups (by time-of-flight secondary ion mass spectrometry) with temperature. Polystyrene (PS) films with various thicknesses (h) and molecular weights were studied. For unannealed PS supported on oxide-coated silicon or poly(dimethyl siloxane) with h > ∼60 nm, Tgsurf approached a plateau value of ∼25 K below the bulk Tg; below 60 nm, Tgsurf decreased with decreasing h. Separately, W exhibited a stepwise increase when h was decreased below the radius of gyration of the polymer. Upon thermal preannealing or deposition on a PS brush or adsorbed layer, the films ceased to exhibit Tgsurf reductions or stepwise change in W. We discuss how an out-of-equilibrium density profile with a deficit near the substrate and de Gennes’ sliding mode may explain these observations." @default.
- W4313366955 created "2023-01-06" @default.
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- W4313366955 date "2022-12-30" @default.
- W4313366955 modified "2023-10-14" @default.
- W4313366955 title "Glass Transition of the Surface Monolayer of Polystyrene Films with Different Film Thicknesses and Supporting Surfaces" @default.
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- W4313366955 doi "https://doi.org/10.1021/acs.macromol.2c02013" @default.
- W4313366955 hasPublicationYear "2022" @default.
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