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Controlled Nanoparticle Size Modifications and Functionalizations through controlled polymeric Nanonetwork Expansion

通过受控聚合物纳米网络扩展控制纳米颗粒尺寸改性和功能化

基本信息

批准号：
1808664
负责人：
Eva Harth
金额：
$ 45万
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：
2018
资助国家：
美国
起止时间：
2018-08-15 至 2021-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1808664&HistoricalAwards=false
关键词：
Controlled Nanoparticle Size Modifications Functionalizations

项目摘要

Plastics that are composed from organic networks are one of the most widely used materials. However, most polymer networks are difficult to manipulate once the material is formed. The research group of Professor Eva Harth at the University of Houston aims to develop robust synthetic methods for the fabrication of tiny organic network structures (of dimensions much smaller than the width of hair) with the ability to modify a parent structure into various other networks of different sizes and functions. The ability to add functions to, modify composition of, or expand the network to allow for repair would broaden the applications of nano-scale polymer networks. This interdisciplinary project educates graduate and undergraduate students in STEM fields. Rising high school seniors and seniors have the opportunity to engage in this research through the Welch Summer Scholars Program.This project focuses on the preparation of photoresponsive nanomaterials and their manipulation in dimension, molecular weight and chemical functional groups. The research team of Professor Harth is establishing methods to synthesize photogrowable nanonetworks from a variety of degradable and non-degradable polymer backbones and cross-linking units containing trithiocarbonate units. Photoinduced polymerizations in the presence and absence of photoredox catalysts are utilized for the dynamic growth to expand the networks and introduce functional monomers into the existing schaffolds. Conditions of photo-controlled radical polymerizations for these expansion processes are thoroughly investigated as these determine the final dispersity of the network. Ultimately, this research is directed to test the capability and range of manipulation which is possible by applying photo-controlled radical polymerization techniques to generate the next generation of nano- and micron scale network materials.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.

由有机网络组成的塑料是最广泛使用的材料之一。然而，大多数聚合物网络一旦形成材料就很难操纵。休斯顿大学伊娃·哈斯教授的研究小组旨在开发稳健的合成方法，用于制造微小的有机网络结构（尺寸远小于头发的宽度），并能够将母体结构修改为不同尺寸和功能的各种其他网络。添加功能、修改其组成或扩展网络以进行修复的能力将拓宽纳米级聚合物网络的应用。这个跨学科项目对研究生和本科生进行 STEM 领域的教育。正在崛起的高中生和高四学生有机会通过韦尔奇暑期学者计划参与这项研究。该项目重点关注光响应纳米材料的制备及其尺寸、分子量和化学官能团的操纵。 Harth教授的研究团队正在建立由各种可降解和不可降解聚合物主链以及含有三硫代碳酸酯单元的交联单元合成可光生长纳米网络的方法。在存在和不存在光氧化还原催化剂的情况下，利用光诱导聚合进行动态生长以扩展网络并将功能单体引入现有支架中。对这些膨胀过程的光控自由基聚合条件进行了彻底的研究，因为它们决定了网络的最终分散性。最终，这项研究旨在测试通过应用光控自由基聚合技术生成下一代纳米和微米级网络材料所可能实现的操纵能力和范围。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。