Interphase of a polymer at a solid interface

Butt, H. J. and Duran, H. and Egger, W. and Faupel, F. and Harmandaris, V. and Harms, S. and Johnston, K. and Kremer, K. and Lin, F. Y. and Lue, L. and Ohrt, C. and Raetzke, K. and Ravelli, L. and Steffen, W. and Vianna, S. D. B. (2014) Interphase of a polymer at a solid interface. Macromolecules, 47 (23). pp. 8459-8465. ISSN 0024-9297

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    Abstract

    Atomistic molecular dynamics simulations of a chemically realistic model of atactic short-chain polystyrene between gold surfaces (111) and Positron Annihilation Lifetime Spectroscopy experiments on similar polystyrene thin films on gold were performed. Results from both approaches show that the free volume voids in the film have a slightly smaller average size than in bulk polystyrene. In agreement to that the existence of an interphase of higher density at the polymer-solid substrate interface is shown both by the simulation as well as in the experiment. The average shape of the voids is similar in the bulk and the film.