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- W4385356211 abstract "In a previous experiment, we observed that the glass transition temperature of the surface monolayer glass transition temperature (Tgsurf) of unannealed polystyrene (PS) films spin-coated on oxide-coated silicon decreased with decreasing film thickness (h < ∼60 nm). However, this h dependence could be removed by thermal preannealing. In this experiment, we investigated the origin of this preannealing effect. We found that Tgsurf of the thin films increased with preannealing time (tANN) and reached the steady-state thick-film value at a characteristic time (τsurf) following the τsurf ∼ h2 scaling for diffusion. Moreover, chain adsorption occurred alongside the increase in Tgsurf during thermal preannealing and reached the steady-state adsorbed amount at a time similar to τsurf. We tentatively suggest that the observed increase in Tgsurf with tANN was caused by diffusion of free-volume holes from the polymer–substrate interface to the free surface due to densification of the interfacial polymer upon chain adsorption." @default.
- W4385356211 created "2023-07-29" @default.
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- W4385356211 date "2023-07-27" @default.
- W4385356211 modified "2023-10-18" @default.
- W4385356211 title "Glass Transition of the Surface Monolayer of Polystyrene Films: Effect of Thermal Preannealing" @default.
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- W4385356211 doi "https://doi.org/10.1021/acs.macromol.3c00966" @default.
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