Model polymer nanocomposites provide an understanding of confinement effects in real nanocomposites
Model polymer nanocomposites provide an understanding of confinement effects in real nanocomposites
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DOI：
10.1038/nmat1870
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发表时间：
2007-04-01
期刊：
影响因子：
41.2
通讯作者：
Torkelson, John M.
中科院分区：
文献类型：
--
作者：
Rittigstein, Perla;Priestley, Rodney D.;Torkelson, John M.
由于包括导电性、韧性和渗透性在内的性能的改善，聚合物纳米复合材料被指定用于从膜到燃料电池的应用范围（1，2）。通过添加无机纳米粒子来增强聚合物性能是界面相互作用、界面面积和纳米填料间距离分布的复杂函数。后两个因素取决于纳米填料的分散性，使得很难对它们对纳米复合材料性能的影响有一个基本的了解。在这里，我们设计模型聚（甲基丙烯酸甲酯）-二氧化硅和聚（2-乙烯基吡啶）二氧化硅纳米复合材料组成的聚合物薄膜之间的二氧化硅幻灯片限制。我们将模型纳米复合材料中玻璃化转变温度（T-g）和物理老化对层间距离的依赖性与真实的纳米复合材料中二氧化硅纳米颗粒含量的依赖性进行了比较。我们表明，模型纳米复合材料提供了一种简单的方法来洞察颗粒间的间距对T-g的影响，并预测近似的老化响应的真实的纳米复合材料。
Owing to the improvement of properties including conductivity, toughness and permeability, polymer nanocomposites are slated for applications ranging from membranes to fuel cells(1,2). The enhancement of polymer properties by the addition of inorganic nanoparticles is a complex function of interfacial interactions, interfacial area and the distribution of inter-nanofiller distances. The latter two factors depend on nanofiller dispersion, making it difficult to develop a fundamental understanding of their effects on nanocomposite properties. Here, we design model poly(methyl methacrylate)-silica and poly(2-vinyl pyridine) silica nanocomposites consisting of polymer films confined between silica slides. We compare the dependence of the glass-transition temperature (T-g) and physical ageing on the interlayer distance in model nanocomposites with the dependence of silica nanoparticle content in real nanocomposites. We show that model nanocomposites provide a simple way to gain insight into the effect of interparticle spacing on T-g and to predict the approximate ageing response of real nanocomposites.