International Research Fellowship Program: Synthesis and Design of Novel Supramolecular Polymers and Rubbers by Environmentally Benign Methods

[075444 . 48]国际研究奖学金计划使美国科学家和工程师能够到国外进行9至24个月的研究。该计划的奖励为联合研究提供了机会，并利用独特或互补的设施、专业知识和国外的实验条件。该奖项将支持Rodney D. Priestley博士与法国巴黎高等物理与工业化学学院的Ludwik Leibler博士开展为期14个月的研究。超分子聚合物是一类聚合物，其中单体单元通过定向可逆的非共价相互作用组装在一起。在没有非共价相互作用的情况下，材料表现为液体。非共价相互作用的强度决定了聚合物的关键参数，如分子量。强制组装的分子识别单元对温度、极性和光等外部刺激敏感。由于这种效应，超分子聚合物被设计为响应灵敏的智能聚合物。材料和自修复材料。与传统聚合物（通过共价键将单体结合在一起）相比，该系统具有许多优点，例如易于成型和回收。然而，由于制备材料的合成加工方法繁琐，且其抗蠕变能力较低，超分子聚合物尚未取代传统聚合物。本项目的目标是探索生产超分子聚合物的新方法和提高材料抗蠕变性能的方法。研究人员正在开发基于反应挤出的连续的、具有工业吸引力的方法，以创建超分子体系，并将纳米填料（例如纳米颗粒）加入基体中，以增强抗蠕变能力。目前正在研究该系统的流变特性，以及该材料用作粘合剂和反应系统的潜力。

0754448PriestleyThe International Research Fellowship Program enables U.S. scientists and engineers to conduct nine to twenty-four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad.This award will support a fourteen month research fellowship by Dr. Rodney D. Priestley to work with Dr. Ludwik Leibler at Ecole Superieure de Physique et Chimie Industrielles in Paris, France.A supramolecular polymer is a class of polymer, in which the monomer units are assembled together by directional reversible non-covalent interactions. In the absence of the non-covalent interactions, the material behaves as a liquid. The strength of the non-covalent interactions determines key polymer parameters such as the molecular weight. The molecular recognition units that coerce the assembly are sensitive to external stimuli such as temperature, polarity, and light. Owing to this effect, supramolecular polymers are being designed as responsive ?smart? materials and self-healing materials. The systems offer many advantages over traditional (monomer units held together by covalent bonds) polymer such as ease of molding and recycling. However, supramolecular polymers have not replaced traditional polymers due to cumbersome synthetic processing methods to prepare the material and their low creep resistance. The objectives of this project are to explore new methods to produce supramolecular polymers and ways to enhance the creep resistance of the materials. The researchers are developing continuous, industrially appealing methods based on reactive extrusion to create supramolecular systems and incorporating nanofiller (e.g. nanoparticles) into the matrix to enhance creep resistance. Rheological properties of the systems are being investigated as well as the potential for the materials to be used as adhesives and responsive systems.