SGER: Dynamics of Homopolymers at Solid Interfaces

聚合物在固体表面的分子运动在从高级复合材料到电子设备的各种应用中所使用的材料的物理特性中肯定起着至关重要的作用。尽管存在这种关键的依赖性，但人们对这些非常薄的层中的分子迁移率知之甚少，这些层的厚度可能在10到100 μ m之间。这是因为这些层太薄，传统技术无法探测它们的移动性。这笔小额探索性研究拨款将用于研究固体表面吸附均聚物的界面迁移率。氘核磁共振（NMR）光谱将用于探测特定氘化聚合物的迁移率。将使用甲基氘化聚（醋酸乙烯）和聚（丙烯酸甲酯），并以不同的量吸附在二氧化硅上。体和表面吸附材料的氘核磁共振光谱将用于确定吸附聚合物的动力学（分子运动）如何随着与表面结合位点的距离而变化。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，结果将允许开发具有增强性能的复合材料。

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.