Effect of Free Surfaces on the Glass Transition Temperature of Thin Polymer Films

作者：James A. Forrest, Kari Dalnoki‐Veress, Jeffrey R. Stevens, John Dutcher · 发表于：Physical Review Letters · 年份：1996 · DOI：10.1103/physrevlett.77.2002 · 被引用次数：1106 · 研究领域：Material Dynamics and Properties、Theoretical and Computational Physics、Liquid Crystal Research Advancements

We report the first measurements of the glass transition temperature ${T}_{g}$ for thin freely standing polystyrene (PS) films. We have used Brillouin light scattering to measure ${T}_{g}$ for freely standing films of different thicknesses. We find that ${T}_{g}$ decreases linearly with film thickness $h$ for $h\ensuremath{\le}700\AA{}$, with a reduction of 70 K for a film with $h\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}290\AA{}$. These measurements characterize unambiguously the effects of the free surface on ${T}_{g}$ of thin polymer films. Results are compared to similar results for supported PS films [Keddie et al., Europhys. Lett. 27, 59 (1994)], and we find that their measured values are influenced strongly by the substrate.