SGER: Dynamics of Homopolymers at Solid Interfaces

聚合物在固体表面的分子运动肯定对材料的物理性能起到关键作用，这些材料用于从先进复合材料到电子设备的各种应用中。尽管存在这种严重的依赖性，但人们对这些非常薄的层中的分子迁移率知之甚少，这些薄层的厚度可能在10到100 ngstrom的数量级。这是因为这些层太薄了，它们的迁移率无法用传统技术探测到。这一小笔探索性研究拨款将启动研究，以探索吸附在固体表面上的均质聚合物的界面流动性。氚核磁共振(核磁共振)波谱将被用来探测特定的氢化聚合物的流动性。甲基氚化聚乙酸乙烯酯和聚丙烯酸甲酯将被使用，并以不同的量吸附在二氧化硅上。体相和表面吸附材料的氚核磁共振谱将被用来确定吸附聚合物的动力学(分子运动)如何随与表面结合位置的距离的函数而变化。%如果成功，这些探索性研究将为这些界面材料的动力学提供一个独特的视角，其结果将使复合材料的开发具有更好的性能。

Blum The molecular motion of polymers at solid surfaces must certainly play a critical role in the physical properties of materials used in a variety of applications from advanced composites to electronic devices. Despite this critical dependence, little is known about the molecular mobility in these very thin layers which can be on the order of 10 to 100 ngstroms thick. This is because these layers are too thin for their mobility to be probed by conventional techniques. This Small Grant for Exploratory Research will initiate studies to probe the interfacial mobility of homopolymers adsorbed on solid surfaces. Deuterium nuclear magnetic resonance (NMR) spectroscopy will be used to probe the mobility of specifically deuterated polymers. Methyl-group deuterated poly(vinyl acetate) and poly(methyl acrylate) will be used and adsorbed on silica at differing amounts. The deuterium NMR spectra of the bulk and surface adsorbed materials will be used to determine how the dynamics (molecular motion) of the adsorbed polymers vary as a function as the distance from the surface binding sites. %%% If successful, these exploratory studies will provide a unique view of the dynamics of these interfacial materials and the results should allow the development of composite materials with enhanced performance.