Experimental evidence for interplay of dynamic heterogeneity and finite-size effect in glassy polymers |
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Authors: | A. K. Kandar J. K. Basu |
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Affiliation: | (1) Naval Research Laboratory, Washington D.C, 20375-5320, USA |
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Abstract: | Despite two decades of extensive research, direct experimental evidence of a dynamical length scale determining the glass transition of confined polymers has yet to emerge. Using a recently established experimental technique of interface micro-rheology we provide evidence of finite-size effect truncating the growth of a quantity proportional to a dynamical length scale in confined glassy polymers, on cooling towards the glass transition temperature. We show how the interplay of variation of polymer film thickness and this temperature-dependent growing dynamical length scale determines the glass transition temperature, which in our case of 2–3 nm thick films, is reduced significantly as compared to their bulk values. |
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