Materials World Network: In-situ NMR Studies of Processing and Deformation of Polymer/Clay Nanocomposites

纳米复合材料提供了一系列新的材料性能（机械，电气，渗透性）。这些特性源于填料和基质之间的大界面和强相互作用，这是通过专用加工实现的。该过程将研究聚（丙烯）或聚（对苯二甲酸乙二醇酯）与合成氟化云母的纳米复合材料。流变NMR结合了NMR成像和PFG NMR，用于流型的局部研究，可深入了解原位加工过程，同时研究混合过程和聚合物的有序效应。剪切诱导有序的信息是由剪切下测得的残余偶极耦合，而对分子流动性的影响来自弛豫时间。剪切速率的局部变化允许在高的局部剪切之后研究聚合物的松弛。由于无机部分含有氟，因此以高灵敏度实现跨越界面的选择性激发，从而允许选择性地研究与填料直接相互作用的聚合物。填料本身的插层和脱层过程由氟和硅固体核磁共振监测。

Nanocomposites offer a new range of materials properties (mechanical, electrical, permability). These properties result from a large interface and strong interaction between filler and matrix, which is achieved by dedicated processing. The process will be investigated for nanocomposites of poly(propylene) or poly(ethylene terephthalate) with synthetic fluorinated mica. Rheological NMR a combination of NMR imaging, and PFG NMR for the localized investigation of flow pattern provides insight into the processing in situ, where the mixing process and the ordering effects on the polymer are investigated simultaneously. Information about shear-induced ordering is provided by the residual dipolar coupling measured under shear, while the influence on molecular mobility is derived from relaxation times. Local variations in the shear rate permit the investigation of the relaxation of the polymer after high local shear. Since the inorganic part contains fluorine selective excitation across the interface is achieved with high sensitivity permitting the selective investigation of the polymer in direct interaction with the filler. The intercalation and delamination process on filler itself is monitored by fluorine and silicon solid-state NMR.