Glass-Transition Temperature Gradient in Nanocomposites: Evidence from Nuclear Magnetic Resonance and Differential Scanning Calorimetry
Glass-Transition Temperature Gradient in Nanocomposites: Evidence from Nuclear Magnetic Resonance and Differential Scanning Calorimetry
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DOI：
10.1103/physrevlett.108.065702
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发表时间：
2012-02-08
影响因子：
8.6
通讯作者：
Saalwaechter, Kay
中科院分区：
文献类型：
--
作者：
Papon, Aurelie;Montes, Helene;Saalwaechter, Kay
在表面附近的聚合物链的动力学减慢已经观察了很多年。在这里，我们表明，模型纳米复合材料的行为可以定量描述的玻璃化转变温度的梯度。我们描述了一个单一的参数范围内的梯度的温度和溶剂的自旋弛豫动力学的影响。此外，该参数允许从本体聚合物之一的纳米复合材料的量热响应的定量描述。
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.