Sterically Congested and Stiffened Alternating Copolymers:  Synthesis, Solution and Solid-State Properties

空间拥挤和硬化交替共聚物：合成、溶液和固态特性

• 批准号: 1206409
• 负责人: Richard Turner
• 金额: $ 39万
• 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: 2012
• 资助国家: 美国
• 起止时间: 2012-05-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1206409&HistoricalAwards=false
• 关键词: Sterically; Congested; Stiffened; Alternating; Copolymers

TECHNICAL SUMMARYAlternating copolymers of functional stilbene monomers with maleic anhydride or maleimides are new sterically crowded, chain stiffened, and precisely functionalized macromolecules. The recently established semi-flexible nature of these backbones, arising from the steric crowding of the 1,2-diphenyl groups from the stilbene monomers and the stiffening effect of five-member cyclic anhydride or imide units is the origin of interesting optical, surface area, and block copolymer solution complexation behavior exhibited by these materials. One thrust of the research in this project will focus on the solution properties, including rheology and self-assembly characteristics, of these semi-flexible polymers in organic solvents (non-ionic copolymers) and in aqueous media (ionic copolymers). The properties of interpolyelectrolyte complexes (IPECs) of small libraries of new all anionic and all cationic semi-flexible macromolecules under various external stimuli such as salt concentration and pH will be studied and the effect of charge density, placement, and chain stiffness on the IPECs elucidated using dynamic light scattering and other techniques. In addition, the effect of charge density and charge type on the aqueous solution behavior of self assembled complexes of new double hydrophilic block copolymers, containing a semi-flexible alternating copolymer block, will be investigated. A second thrust will involve studies of the effect of the semi-flexible contorted alternating copolymer structures on polymer properties such as surface area, gas permeability, and adsorbent properties in the solid state. New hybrid block copolymers based on poly(arylene ether sulfone) middle blocks will be synthesized with alternating copolymer end blocks and will be cast into films and the mechanical, morphological, and gas permeability properties studied. The nanoporous properties of hypercrosslinked polymer particles, containing semi-flexible alternating structures with selected types of functional groups, will be studied using a nitrogen adsorption method.NON-TECHNICAL SUMMARYMany technologies that are critical for the health, sustainability, and security of our society are dependent on the discovery and development of new polymeric materials that enable various types of devices in the optical and electronic areas to function or that can deliver payloads of therapeutics across biological membranes. The new polymeric materials resulting from the fundamental studies of this grant have potential for applications in a number of areas where enabling polymeric materials are indispensable components in successful innovations to products. Potential applications range from high surface area polymers for adsorbents for gases such as hydrogen and carbon dioxide, new water soluble polymers with tailored stimuli responsiveness for biomedical processes, and new hybrid polymer membranes for gas separations. Results from this research will be presented at major conferences and published in leading journals. Graduate students involved in this project will master the fundamentals of polymer science and engineering and will learn to work in a fast-paced interdisciplinary environment. These graduate students will have the opportunity to mentor undergraduate students in an NSF Research Experience for Undergraduates program at Virginia Tech and interact with industrial researchers in numerous outreach programs from the Virginia Tech polymer community. Participation in this research will provide students with a well-rounded education platform for preparation for successful careers in the science and technology based enterprise of our nation

具有甲基酸酐或马来酰亚胺的功能性小苯甲状管单体的技术摘要共聚物是新的，链的链，稳固且精确化的大分子。 这些骨干的最近建立的半屈曲性质是由stilbene单体的1,2-二苯基组的空间拥挤引起的，以及这些材料表现出的有趣的光学，表面积和块共聚物络合行为的五核环节或Imide单元的僵硬效果是这些材料的有趣的光学，表面积和块共聚物络合行为的起源。 该项目中该研究的一项作用将重点放在有机溶剂（非离子共聚物）和水性介质（离子共聚物）中的这些半充实聚合物（包括流变学和自组装特征）的溶液特性。 在各种外部刺激下，将研究所有新的阴离子和所有阳离子半充实的大分子的小库的室内聚电解质复合物（IPEC）的特性，例如盐浓度和pH，以及使用动态轻度散射和其他技巧的IPEC的电荷密度，放置和链刚度的效果。 此外，将研究电荷密度和电荷类型对新的双重亲水块共聚物的自组装复合物的水溶液行为的影响，该复合物包含半柔性交替共聚物块。 第二个推力将涉及对半灵感扭曲的交替共聚物结构对聚合物特性（例如表面积，气体渗透性和吸附特性）在固态中的影响的研究。 基于聚（芳基醚磺基）中间块的新杂化块共聚物将与交替的共聚物最终块合成，并将被施加到膜中，并研究了所研究的机械，形态和气体通透性性能。 The nanoporous properties of hypercrosslinked polymer particles, containing semi-flexible alternating structures with selected types of functional groups, will be studied using a nitrogen adsorption method.NON-TECHNICAL SUMMARYMany technologies that are critical for the health, sustainability, and security of our society are dependent on the discovery and development of new polymeric materials that enable various types of devices in the optical and electronic areas to function or that可以在生物膜上提供有效载荷。 该赠款的基本研究产生的新聚合物材料具有在成功创新产品中必不可少的组成部分的许多领域的应用。 潜在的应用范围从高表面积聚合物用于吸附剂的吸附剂，例如氢和二氧化碳，新的水溶性聚合物，具有针对生物医学工艺的刺激反应性以及用于气体分离的新混合聚合物膜。 这项研究的结果将在主要会议上介绍，并在领先期刊上发表。 参与该项目的研究生将掌握聚合物科学和工程的基础知识，并将学会在快节奏的跨学科环境中工作。 这些研究生将有机会在Virginia Tech的NSF研究经验中指导本科生，并与弗吉尼亚理工大学聚合物社区的众多外展计划与工业研究人员进行互动。 参与这项研究将为学生提供一个全面的教育平台，以为基于科学和技术的国家的成功职业做准备