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• W2085478308 abstract "The glass transition temperature of polystyrene and poly(methyl methacrylate) films on polar and nonpolar substrates was measured as a function of thickness using a thermal probe in contact with a polymer film. Using a technique called local thermal analysis, heat loss into the film was monitored as the temperature of the probe was ramped from ambient temperature to temperatures as high as 200 °C. The glass transition temperature was determined from a change in slope in the heat loss versus temperature plot. The Tg of polystyrene on silicon oxide decreased by as much as 25 °C below the bulk value for films 13 nm thick. The same trend in the glass transition temperature was observed for polystyrene films on silicon oxide treated with hexamethyldisilizane (HMDS). The Tg of poly(methyl methacrylate) on silicon oxide increased by up to 7 °C above the bulk value for films 18 nm thick. For poly(methyl methacrylate) on silicon oxide treated with HMDS, the Tg decreased by 10 °C below the bulk value for films 21 nm thick. The glass transition temperatures measured with the thermal probe compared favorably with values of Tg determined by ellipsometry. Local thermal analysis is an alternative to methods of determining Tg based on thermally induced changes in film thickness. The technique, relying on changes in the heat capacity and modulus of the polymer at Tg, may help resolve the current controversies over the measurement of the Tg in thin films." @default.
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• W2085478308 date "2000-07-29" @default.
• W2085478308 modified "2023-10-10" @default.
• W2085478308 title "Thermal Probe Measurements of the Glass Transition Temperature for Ultrathin Polymer Films as a Function of Thickness" @default.
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• W2085478308 doi "https://doi.org/10.1021/ma0003349" @default.
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