Collaborative Research: Polar-Polyolefin Block Copolymers via MILRad Functionalization: A Platform for Amphiphilic Nanostructured Material Synthesis

合作研究：通过 MILRad 功能化制备极性聚烯烃嵌段共聚物：两亲性纳米结构材料合成平台

基本信息

批准号：
2108576
负责人：
Eva Harth
金额：
$ 32.14万
依托单位：
University of Houston
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108576&HistoricalAwards=false
关键词：
Collaborative Research Polar Polyolefin Block

项目摘要

With the support of the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry, Professor Eva Harth at the University of Houston and Professor Krzysztof Matyjaszewski at Carnegie Mellon University aim to explore the capabilities of generating anchor units in polymers of plastic materials during their synthesis and using these "plug-in" units as activators for further modification of the polymer. This two-step process will result in polymer chains that are composed of two segments (or blocks) of distinctly different structures and properties. The unique polarity and solubility of each block allows the polymer to be used as "stitches" between two immiscible plastic materials or to form 3-D structures in shapes of spheres, worms and disks. The two research teams complement each other in their areas of expertise and are expected to work synergistically to establish chemical pathways to synthesize these diblock copolymers and study their special properties. An automated continuous flow approach will be investigated to increase further the ease and practicability of diblock polymer preparation. The results of this research are expected to enhance knowledge in how to combine polar and non-polar chains to gain access to novel materials, and the accomplishments will be communicated to the public and scientific community. This project will help to prepare a skilled workforce for the polymer industry by training graduate students and undergraduates, including students from underrepresented groups, in many aspects of polymer chemistry, organometallic chemistry and analysis.Specifically, the two teams will collaborate to explore block copolymer and nanostructure synthesis based on new methods development, including a novel radical- and spin-trapping capability, to integrate olefin, acrylic and ethylene oxide segments into one polymeric architecture. The generation of macro-radicals through metal insertion/light-initiated radical polymerization as part of the polymerization pathway will be utilized to prepare intermediates to promote controlled radical polymerization via atom transfer radical polymerization and nitroxide-mediated polymerization. This strategy may open up a new avenue for polar polyolefin di-block and triblock copolymers via chain extension and is expected to provide convenient access to block copolymers not yet available using existing methodology or only available via multi-step approaches. Polymerization-induced self-assembly processes and crystallization-driven self-assembly will be investigated as potential approaches to form nanostructures from di- and triblocks composed of polyolefins and polyacrylates. Continuous flow chemistry will be used to optimize and scale up polyolefin macro-initiator synthesis and will be used in support of the synthesis of a diverse set of polyolefin-containing nanostructures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学系高分子、超分子和纳米化学项目的支持下，休斯顿大学 Eva Harth 教授和卡内基梅隆大学 Krzysztof Matyjaszewski 教授旨在探索塑料材料聚合物在合成过程中生成锚定单元的能力并使用这些“插件”单元作为进一步改性聚合物的活化剂。这种两步过程将产生由两个结构和性能截然不同的链段（或嵌段）组成的聚合物链。每个嵌段独特的极性和溶解度使得聚合物可以用作两种不混溶塑料材料之间的“缝线”，或形成球体、蠕虫和圆盘形状的 3D 结构。两个研究团队在各自的专业领域相互补充，预计将协同工作，建立合成这些二嵌段共聚物的化学途径并研究其特殊性能。将研究自动连续流动方法，以进一步提高二嵌段聚合物制备的简易性和实用性。这项研究的结果预计将增强有关如何结合极性链和非极性链以获得新型材料的知识，并将向公众和科学界传达成果。该项目将通过在聚合物化学、有机金属化学和分析的许多方面培训研究生和本科生（包括来自代表性不足群体的学生），帮助为聚合物行业培养一支熟练的劳动力队伍。具体来说，两个团队将合作探索嵌段共聚物和基于新方法开发的纳米结构合成，包括新颖的自由基和自旋捕获能力，将烯烃、丙烯酸和环氧乙烷片段整合到一种聚合物结构中。作为聚合途径的一部分，通过金属插入/光引发自由基聚合产生大自由基将用于制备中间体，以通过原子转移自由基聚合和硝基氧介导的聚合促进受控自由基聚合。该策略可能为极性聚烯烃二嵌段和三嵌段共聚物通过扩链开辟一条新途径，并有望为使用现有方法无法获得或只能通过多步骤方法获得的嵌段共聚物提供便利。将研究聚合诱导的自组装过程和结晶驱动的自组装，作为由聚烯烃和聚丙烯酸酯组成的二嵌段和三嵌段形成纳米结构的潜在方法。连续流动化学将用于优化和扩大聚烯烃大分子引发剂合成，并将用于支持多种含聚烯烃纳米结构的合成。该奖项反映了 NSF 的法定使命，并通过评估被认为值得支持利用基金会的智力优势和更广泛的影响审查标准。