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Molecular dynamics of polymers at nanometric length scales: From thin layers to isolated coils

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Abstract

The (dynamic) glass transition of polymers in nanometer thin layers is both a prevailing but as well a highly controversial topic. In the current review the literature for the most studied case of polystyrene (as freestanding films or as deposited and suspended layers) will be discussed. Based on this, the extraordinary impact of sample preparation is immediately evident and outlined in detail. Recent results are presented on nanometric thin (≥5 nm) layers of polystyrene (PS) having widely varying molecular weights and polymethylmethacrylate (PMMA) deposited on different substrates. For the dielectric measurements two sample geometries are employed: the conventional technique using evaporated electrodes and a recently developed approach taking advantage of silica nanostructures as spacers. All applied methods deliver the concurring result that deviations from glassy dynamics and from the glass transition of the bulk never exceed margins of ±3 K independent of the layer thickness, the molecular weight of the polymer under study and the underlying substrate. Novel experiments are described on thin layers of polyisoprene, a type A polymer, having relaxation processes on two different length scales, the segmental and the normal mode. A further exciting perspective is the measurement of the dynamics of isolated polymer coils, for which first results will be presented. © 2013 Springer Science+Business Media Dordrecht.

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Kremer, F., Mapesa, E. U., Tress, M., & Reiche, M. (2013). Molecular dynamics of polymers at nanometric length scales: From thin layers to isolated coils. NATO Science for Peace and Security Series B: Physics and Biophysics. https://doi.org/10.1007/978-94-007-5012-8_12

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