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A site-directed spin-labeling study of surfactants in polymer–clay nanocomposites

机译:聚合物-粘土纳米复合材料中表面活性剂的定点自旋标记研究

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摘要

Polymer–clay nanocomposites exhibit much improved mechanical, physical, and chemical properties compared to the pure polymer. The interaction of polymer and organically modified silicates is mainly influenced by the surfactant layer in the system. To investigate the structure and dynamics of this surfactant layer, various electron paramagnetic spectroscopy (EPR) techniques were applied. Continuous wave EPR experiments showed a temperature-dependent heterogeneous mobility of the surfactant layer in organoclay as well as a difference in dynamics along the alkyl chain. Intercalation of polystyrene causes a significant slowdown in surfactant dynamics. Electron spin echo envelope modulation indicates a closer contact of the polymer with the mid of the surfactant tail than with the end of the tail. From the obtained data the picture of flatly lying surfactants on clay platelets with a mobility gradient along their alkyl chains can be drawn.
机译:与纯聚合物相比,聚合物-粘土纳米复合材料的机械,物理和化学性能大大提高。聚合物与有机改性的硅酸盐的相互作用主要受体系中表面活性剂层的影响。为了研究该表面活性剂层的结构和动力学,应用了各种电子顺磁光谱(EPR)技术。连续波EPR实验表明,有机粘土中表面活性剂层的温度依赖性异质迁移率以及沿烷基链的动力学差异。聚苯乙烯的插入导致表面活性剂动力学的显着减慢。电子自旋回波包络调制表明聚合物与表面活性剂尾部中部的接触比与尾部末端的接触更近。从获得的数据可以得出在粘土薄片上平坦的表面活性剂在其烷基链上具有迁移率梯度的图片。

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