Entangled Polymers by Design Using Supramolecular Chemistry

利用超分子化学设计缠结聚合物

• 批准号: 1106899
• 负责人: Harry Gibson
• 金额: $ 42万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1106899&HistoricalAwards=false
• 关键词: Entangled; Polymers; Design; Using; Supramolecular

In this project funded by the Macromolecular, Supramolecular and Nanochemistry Program of the Chemistry Division, Harry Gibson of the Virginia Polytechnic Institute and State University will synthesize and study macromolecules in which branch points, crosslinks or repeat units are mechanical connections in the form of rotaxanes or catenanes. A variety of polymerization techniques (e. g., anionic, atom transfer radical, nitroxide mediated, classical free radical and ring opening metathesis) will be employed to prepare well-defined macromolecules with terminal, central or multiple host and guest functionalities. These polymers will then be self-assembled into a variety of topologies (star, H-branched, poly[2]rotaxane, bottle brush, etc.) in both homopolymeric and copolymeric forms, all involving rotaxane linkages, some topologies not readily accessible otherwise. These supramolecular rotaxane polymers are expected to exhibit enhanced properties relative to covalent polymers because of the restoring force between the cyclic and linear components present in the rotaxane units. Morphological, rheological, thermal and mechanical studies will elucidate the novel properties and responses of these systems that distinguish them from normal covalently linked macromolecules, providing new insights into the ultimate properties that are achievable through supramolecular science. The broader impacts involve training undergraduate and graduate students as well as postdoctoral researchers, an ongoing commitment to training students from groups underrepresented in the chemical sciences, and disseminating research results through publications in journals and presentations at conferences.This work will enhance our fundamental understanding about polymers linked mechanically via interlocking loops and chains and their physical behavior. Polymer chains are the fundamental units of many plastic materials, and the development of new types of polymers could lead to new applications in biomedical materials, coatings, and composites.

在这项由化学部高分子、超分子和纳米化学计划资助的项目中，弗吉尼亚理工学院和州立大学的哈里·吉布森将合成和研究支点、交联剂或重复单元为轮烷或环戊烷形式的机械连接的大分子。各种聚合技术(如阴离子、原子转移自由基、氮氧化物介导、经典自由基和开环歧化)将被用来制备具有端基、中心或多个主客体功能的定义明确的大分子。然后，这些聚合物将自组装成各种拓扑结构(星形、H-支化、聚[2]轮烷、瓶刷等)。在均聚和共聚两种形式中，都涉及轮烷键，一些拓扑结构以其他方式很难获得。这些超分子轮烷聚合物有望表现出相对于共价聚合物更好的性能，因为轮烷单元中存在的环状和线状成分之间存在恢复力。形态、流变学、热学和力学研究将阐明这些体系区别于正常共价连接大分子的新颖性质和响应，为通过超分子科学实现的终极性质提供新的见解。更广泛的影响包括培训本科生和研究生以及博士后研究人员，持续致力于培训化学科学中代表性较低的群体的学生，并通过在期刊上发表文章和在会议上发表演讲来传播研究成果。这项工作将增强我们对通过互锁环和链机械连接的聚合物及其物理行为的基本理解。聚合物链是许多塑料材料的基本单元，新型聚合物的开发可能会在生物医学材料、涂料和复合材料中带来新的应用。