GOALI: Dynamic Behavior of Preferentially Adsorbed Block Copolymer Brushes

摘要CTS-9816147克莱姆森大学/ S. Kilbey本提案中概述的工作将研究多嵌段共聚物层的性质，这些共聚物优先通过一个嵌段吸附在表面上，而其他嵌段不吸附。 主要目的是了解如何操纵这些结构形成层的剪切性能，以建立具有定制的摩擦性能和磨损特性的聚合物改性表面。 操纵聚合物改性表面的摩擦性能直接影响技术领域，从润滑和胶体稳定到表面活性聚合物的新应用，包括显示设备，微型阀和传感器。 本提案中描述的工作形成了一个连贯的计划，系统地研究溶剂质量，剪切速率和层组成对各种聚合物/溶剂对的动态响应的影响。 必要的聚合物材料的合成和表征将通过与伯明翰亚拉巴马大学的Jimmy Mays博士的合作来处理。 安装在克莱姆森大学的改良表面力装置将用于直接测量两个聚合物涂层表面横向滑动通过彼此所需的力。 这些测量是在分子长度尺度上进行的，因此提供了表面之间分子水平摩擦相互作用的信息。 这些界面层的动态行为如何受到分子量，链结构和溶液性质变化的影响的积累数据是开发两亲性大分子改性表面的预测设计能力的核心。 这项工作也将导致一个更完整的机构的聚合物刷，这将是一般有用的软材料改性表面的开发和工程的结构-性能数据。

ABSTRACTCTS-9816147Clemson Univ./S. KilbeyThe work outlined in this proposal will investigate the properties of layers of multiblock copolymers that are preferentially adsorbed in a surface through one block, leaving the other block(s) non-adsorbed. The primary objective is to understand how to manipulate the shear properties of these structure-forming layers in order to build polymer-modified surfaces with tailored frictional properties and wear characteristics. Manipulating the frictional properties of polymer-modified surfaces directly impact areas of technology ranging from lubrication and colloid stabilization to novel applications for surface active polymers, including display devices, microvalves, and sensors. The work described in this proposal forms a coherent plan to systematically investigate the impact of solvent quality, shear rate, and layer composition on the dynamic response of various polymer/solvent pairs. The synthesis and characterization of the necessary polymeric materials will be handled through a collaboration with Dr. Jimmy Mays of the University of Alabama at Birmingham. A modified Surface Forces Apparatus housed at Clemson University will be used to directly measure the forces required to slide two polymer coated surfaces laterally past each other. These measurements are done on molecular length scales and therefore, provide information on the molecular-level frictional interactions between the surfaces. The accumulated data on how the dynamic behavior of these interfacial layers are impacted by changes in molecular weight, chain architecture, and solution properties are central to developing the capability to do predictive design of surfaces modified with amphiphilic macromolecules. This work will also result in a more complete body of structure-property data of polymer brushes, which will be generally useful for the developing and engineering of surfaces modified by soft materials.