Dynamics of Adsorbed Polymers

这项研究集中在一个重要的，但很大程度上尚未解决的问题：聚合物在固体表面的动力学。实验策略将是进行动力学的原位实验，聚合物首先吸附到具有良好特征的单一固体表面，然后与原来在自由溶液中同位素标记的聚合物交换。将确定交换过程和结合分数的演化的时间常数。他们将研究整体平衡的动力学，吸附状态之间的链松弛，以及解吸和吸附的可逆性所需的时间。感兴趣的实验变量将包括链的分子量，溶液浓度，溶剂的热力学质量，链的拓扑结构（线性和星形），流体动力学流动条件，以及表面的功能和功能密度。研究方法将是红外光谱衰减全反射。这项研究的发现将与聚合物行为的现代物理理论相关联，并可能在胶体系统的空间稳定，薄膜形成，色谱和润滑方面找到应用。

This research focuses upon an important but largely unsolved problem: the dynamics of polymers at solid surfaces. The experimental strategy will be to make in situ experiments of the kinetics with which polymers first adsorb to a well-characterized single solid surface and then exchange with isotopically labelled polymers originally in free solution. Time constants will be determined for the exchange process and also for evolution of the bound fraction. They will investigate the dynamics underlying an overall equilibrium, chain relaxation between adsorption states, and the times required for reversibility of desorption and adsorption. Experimental variables of interest will include molecular weight of the chains, solution concentration, thermodynamic quality of the solvent, chain topology (linear and star), hydrodynamic flow conditions, and the functionality as well as density of functionality of the surface. The method of investigation will be infrared spectroscopy in attenuated total reflection. The findings of this research will be correlated with modern physical theories of polymer behavior and may find application in steric stabilization of colloidal systems, film formation, chromatography, and lubrication.