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Glass-transition temperature gradient in nanocomposites: evidence from nuclear magnetic resonance and differential scanning calorimetry. 2012
Aurélie Papon, and
Hélène Montes, and
Mohamed Hanafi, and
François Lequeux, and
Laurent Guy, and
Kay Saalwächter
PPMD-SIMM, Soft Matter Science and Engineering, UMR 7615 CNRS/UPMC/ESPCI ParisTech, Paris, France. aurelie.papon@espci.org
The slowing-down of the dynamics of a polymer chain near a surface has been observed for many years now. Here we show that the behavior of model nanocomposites can be quantitatively described with a gradient of glass-transition temperature. We describe with a single parameter-the range of this gradient-the temperature and solvent effect on the spin relaxation dynamics. Moreover, this parameter allows a quantitative description of the nanocomposite calorimetric response from the one of the bulk polymer.
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