Dipartimento di Scienze Chimiche, Università di Padova , via Marzolo 1, 35131 Padova, Italy.
J Phys Chem B. 2012 Jun 28;116(25):7596-602. doi: 10.1021/jp303685q. Epub 2012 Jun 13.
The interfacial area between the matrix and the filler is a key parameter which shapes the performance of polymer-based composites and nanocomposites, even though it is difficult to quantify. A very easy SAXS method, based on the Porod equation, is proposed for measuring the specific surface area of nanofillers embedded in a polymer matrix. In order to assess its reliability, this approach was applied to natural rubber- or styrene butadiene-based samples containing different types of montmorillonite clay. A wide range of specific surfaces was detected. SAXS data were compared to complementary X-ray diffraction and TEM information, obtaining a good agreement. Interpretation of the tensile properties by theoretical models and comparison with the literature corroborated the validity of the specific surface area measurement. The possibility to quantify this feature of composites allows the rational design of such materials to be improved.
尽管难以量化，但基体与填料之间的界面面积是影响聚合物基复合材料和纳米复合材料性能的关键参数。本文提出了一种非常简单的小角 X 射线散射（SAXS）方法，基于 Porod 方程，用于测量嵌入聚合物基体中的纳米填料的比表面积。为了评估其可靠性，该方法应用于含有不同类型蒙脱土的天然橡胶或丁苯橡胶基样品中。检测到了广泛的比表面积。将 SAXS 数据与补充的 X 射线衍射和 TEM 信息进行比较，得到了很好的一致性。通过理论模型对拉伸性能进行解释，并与文献进行比较，证实了比表面积测量的有效性。复合材料这种特性的量化可能性，使得此类材料的合理设计得到了改善。
