Dynamic and Nonequilibrium Aspects of Polymer Adsorption

大分子在材料界面上的吸附 在当今许多关键技术中发挥着关键作用。 许多先进材料严重依赖聚合物的作用 吸附作用 比如耐冲击聚合物共混物， 汽车应用和多层膜层压材料 “智能”屏障和成像技术大受欢迎 改进的性能和/或可加工性， 界面区域通过聚合物吸附改性。 依赖于胶体悬浮液的材料技术（例如， 涂层工艺和陶瓷制造的“粉浆浇铸”） 利用聚合物吸附， 悬浮液性质 聚合物吸附也起着关键作用 在生物医学中的作用 例如，血液的吸附 蛋白质是开发人造血管、血液 接触装置和药物输送系统。 在 分离领域，吸附色谱，它依赖于 竞争吸附，是最有效的手段， 分离细微差别的大分子。 聚合物吸附的动态和非平衡态 很大程度上是未开发的。 这项工作的主要目标是 在模型材料（线性均聚物）中研究这些方面 和介电和金属表面上的二嵌段共聚物）， 石英微量天平、ESR和荧光光谱 和图案光漂白。 这些方法将探测 吸附层中的基本动力学现象， 阐明了吸附机理。 结果将 为控制吸附过程提供了基础， 在应用中。 该项目涉及密切合作 化学工程与化学系 在哥伦比亚大学。

The adsorption of macromolecules at interfaces of materials plays a key role in many of today's critical technologies. Many advanced materials rely heavily on the effects of polymer adsorption. For example. impact resistant polymer blends for automotive applications and multilayer film laminates for "smart" barriers and imaging technologies enjoy dramatically improved performance and/or processibility when the interfacial regions are modified by polymer adsorption. Materials technologies relying on colloidal suspensions (e.g. coating processes and "slip-casting" for ceramics manufacture) utilize polymer adsorption for crucial improvement in suspensions properties. Polymer adsorption also plays a key role in biomedicine. For example, the adsorption of blood proteins is a key issue in developing protheses, blood- contacting devices and drug-delivery systems. In the separations field, adsorption chromatography, which relies on competitive adsorption, is the most effective means of separating subtly different macromolecules. The dynamic and nonequilibrium aspects of polymer adsorption are largely unexplored. The principal goal of this work is to study these aspects in model materials (linear homopolymers and diblock copolymers on dielectric and metal surfaces) using a quartz microbalance, ESR, and fluorescence spectroscopies and pattern photobleacing. These methods will probe elementary dynamic phenomenal in adsorbed layers and will clarify the mechanisms of adsorption. The results will provide a basis for controlling adsorption processes crucial in application. The project involves close collaboration between the Department of Chemical Engineering and Chemistry at Columbia University.