CAREER: The Synthesis of New Polymers and Materials using Living Polymerizations: Well-Defined Hybrid Organic/ Inorganic Nanoparticles

职业：利用活性聚合合成新型聚合物和材料：明确的有机/无机杂化纳米颗粒

• 批准号: 9733786
• 负责人: Timothy Patten
• 金额: $ 34.28万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733786&HistoricalAwards=false
• 关键词: CAREER; Synthesis; New; Polymers; Materials

9733786 Patten Nanoclusters have garnered much interest due to their unique size- dependent properties and, consequently, their potential for technological applications. The next important step in exploiting the properties of nanoclusters is their incorporation into and ordering within film-forming materials. The principal investigator will study methods to prepare well-defined hybrid inorganic / organic nanoparticles in which the cores are (semi)metal oxide nanoclusters and the exterior layers are vinyl polymers, such as polystyrene, poly(methyl methacrylate) and poly(methyl acry ate). In particular, silica, will be studied for the purposes of methods development, and then these methods will be applied to other (semi)metal oxide nanoclusters exhibiting magnetic and optical properties. This project will initially investigate methods to attach initiators for living radical polymerizations to the surfaces of the nanoclusters and then use these surface-modified nanoclusters as initiators for such polymerizations. The anticipated product material will be a nanocluster core with well-defined polymer chains grafted from the surface. Because living polymerizations will be used to graft the polymer chains, the structure and composition of the polymer arms become a tool to investigate methods for ordering the nanoclusters within the polymer film. The principal investigator will therefore develop methods for the end- functionalization of polymers prepared using living radical polymerizations. One proposed method involves the block copolymerization of vinyl monomers with cyclic ketene acetals followed by hydrolysis to yield carboxylic acid-terminated polymers. These end-functionalization methods will be used to place a variety of functional groups at the surface chain ends of the nanocluster star polymers. The grafting of block copolymers from the surfaces of nanoclusters will also be studied. The microphase separation behavior of the resulting starblock c opolymers will be exarnined to determine whether nanoclusters can be ordered within polymer films using this strategy. %%% The principal investigator will integrate these research efforts with the educational goal of incorporating polymer science into the chemistry curriculum at UC Davis. Because most of the major US chemical producers have significant business efforts in polymers and polymeric materials, chemistry students have a high probability of moving into careers in polymer research, development and manufacturing. Thus, the addition of this subject to the curriculum will provide students with valuable training and skills that will enhance their employment prospects in an increasingly competitive chemistry job market. ***

9733786 Patten 纳米团簇由于其独特的尺寸依赖性质以及因此其技术应用的潜力而引起了人们的极大兴趣。 利用纳米团簇性质的下一个重要步骤是将其并入成膜材料中并在成膜材料中排序。 主要研究人员将研究制备明确的混合无机/有机纳米颗粒的方法，其中核心是（半）金属氧化物纳米簇，外层是乙烯基聚合物，如聚苯乙烯，聚（甲基丙烯酸甲酯）和聚（丙烯酸甲酯）。 特别是，二氧化硅，将被研究的方法开发的目的，然后这些方法将被应用到其他（半）金属氧化物纳米团簇表现出的磁性和光学性能。 该项目将首先研究将活性自由基聚合引发剂附着到纳米团簇表面的方法，然后使用这些表面改性的纳米团簇作为此类聚合的引发剂。 预期的产品材料将是具有从表面接枝的明确定义的聚合物链的纳米簇核心。 由于活性聚合将用于接枝聚合物链，聚合物臂的结构和组成成为研究聚合物膜内纳米团簇有序化方法的工具。 因此，主要研究者将开发使用活性自由基聚合制备的聚合物的末端官能化方法。 一种提出的方法涉及乙烯基单体与环状烯酮缩醛的嵌段共聚，然后水解以产生羧酸封端的聚合物。 这些末端官能化方法将用于在纳米簇星星聚合物的表面链末端放置各种官能团。 从纳米团簇表面接枝嵌段共聚物也将被研究。 将检验所得星形嵌段聚合物的微相分离行为以确定纳米团簇是否可以使用这种策略在聚合物膜内有序化。 首席研究员将把这些研究工作与将聚合物科学纳入加州大学戴维斯分校化学课程的教育目标相结合。 由于大多数美国主要的化学品生产商在聚合物和聚合物材料方面都有重大的业务努力，化学专业的学生很有可能进入聚合物研究，开发和制造领域。 因此，在课程中增加这一主题将为学生提供宝贵的培训和技能，这将提高他们在竞争日益激烈的化学就业市场的就业前景。 ***