Glass transition in Ultrathin Polymer Films : A Thermal Expansion Study

Details Glass transition in Ultrathin Polymer Films : A Thermal Expansion Study Glass transition in Ultrathin Polymer Films : A Thermal Expansion Study

2005-01-19

arxiv.org/abs/cond-mat/0501444v1

Phys Rev E 71, 041801 (2005)

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 5 figures

Scientific paper

10.1103/PhysRevE.71.041801

Glass transition process gets affected in ultrathin films having thickness comparable to the size of the molecules. We observe systematic broadening of glass transition temperature (Tg) as the thickness of the polymer film reduces below the radius of gyration but the change in the average Tg was found to be very small. Existence of reversible negative and positive thermal expansion below and above Tg increased the sensitivity of our thickness measurements performed using energy dispersive x-ray reflectivity. A simple model of Tg variation as a function of depth expected from sliding motion could explain the results. We observe clear glass transition even for 4 nm polystyrene film that was predicted to be absent from ellipsometry measurements of thicker films.

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