CAS: New Catalytic Processes for Polyolefin Sustainability and Waste Utilization

CAS：聚烯烃可持续性和废物利用的新催化工艺

基本信息

批准号：
1955730
负责人：
Lawrence Sita
金额：
$ 49万
依托单位：
University of Maryland, College Park
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2023-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1955730&HistoricalAwards=false
关键词：
CAS New Catalytic Processes Polyolefin

项目摘要

With this award, the Chemical Catalysis Program of the Division of Chemistry is supporting the research of Professor Lawrence R. Sita of the Department of Chemistry and Biochemistry at the University of Maryland. Professor Sita and his research team are developing new catalytic systems for polymerization that convert abundant and inexpensive feedstock chemicals into new polyolefin materials with defined and controllable molecular structure. The polymers prepared with this new catalyst system are designed to be added to existing polyolefin waste to improve conversion to second- or multi-use polymeric products of increased commercial value. Society’s dependence on plastics comes with a significant penalty of more than 400 million pounds of plastic waste that is introduced into the environment each year. The Sita research group is focused on finding solutions to this problem and designing new polyolefin materials that can serve as replacements for plastics with more severe environmental impacts than polyolefins. This project is providing education and training for a diverse group of undergraduate and graduate students, as the next generation of scientists and leaders for sustainable science policy. Outreach activities include a one-ton plastic recycling challenge to engage elementary and high school students in a broader understanding of the problems society faces with plastic waste. New inventions, technologies, and products that are being developed through this project have potentially significant long term impacts on polymer science and technology. Professor Sita and his research group are developing configurationally-stable, enantio-enriched transition-metal complexes that function as well-defined catalysts for the enantio- and stereoselective living coordinative chain transfer polymerization (LCCTP), co-polymerization, and cyclopolymerization of olefins and non-conjugated dienes. These new catalyzed processes are providing novel classes of highly stereoregular polyolefins with technologically-relevant physical properties. A variety of spectroscopic methods and isotopically-labeled complexes and monomers are being used to understand the mechanism of enantio- and stereoselective LCCTP to further optimize these systems. Stereoselective LCCTP is guiding the design and production of new classes of well-defined polyolefin block copolymers that undergo microphase-separation in the condensed state and that can be used as plastic waste blend compatibilizers and property modifiers.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.

通过该奖项，化学系的化学催化计划支持马里兰大学化学和生物化学系劳伦斯·R·Sita教授的研究。 SITA教授和他的研究团队正在开发新的聚合催化系统，以将丰富且廉价的原料化学物质转化为具有定义和受控分子结构的新聚苯乙烯材料。使用这种新催化剂系统制备的聚合物旨在将其添加到现有的聚烯烃废物中，以改善商业价值增加的第二或多用途聚合物产品的转化。社会对塑料的依赖受到每年引入环境的4亿磅塑料废物的重大罚款。 SITA研究小组的重点是寻找解决此问题的解决方案，并设计了新的聚烯材料，这些材料可以用作比聚芬蛋白更严重的塑料替代塑料。该项目正在为一组本科生和研究生提供教育和培训，作为可持续科学政策的下一代科学家和领导者。外展活动包括一吨塑料回收的挑战，让我们吸引小学和高中生，对社会面临塑料废物面临的问题有更广泛的了解。通过该项目开发的新事件，技术和产品对聚合物科学和技术产生了重要的长期影响。 SITA教授及其研究小组正在开发具有构型型，富含对映体的过渡金属配合物，可作为对映体和立体选择的生活协调链传递聚合（LCCTP），共同聚合，共聚合以及烯烃和非胶蛋白的环境化和非甲壳糖的环化化。 Dienes。这些新的催化过程正在提供具有技术与技术相关的物理特性的新型高度立体聚集素。各种光谱法和同位素标记的复合物和单体被用于了解对映选择性LCCTP的机理，以进一步优化这些系统。立体选择性LCCTP正在指导新定义的聚烯烃块共聚物的设计和生产，这些共聚物在冷凝状态下经历了微相分离，并且可以用作塑料废物混合物兼容性和财产修饰符。该奖项通过评估了CR的支持，反映了NSF的法规构成的依据，并在范围内构成了cr Infestia的支持。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Investigation of relative stabilities of CPAM zirconium cycloalkylmethyl vs isomeric ω-alkenyl complexes: Crystal structures of the cyclobutylmethyl and cyclopentylmethyl complexes

CPAM 环烷基甲基锆与异构α-烯基配合物的相对稳定性研究：环丁基甲基和环戊基甲基配合物的晶体结构

DOI：
10.1016/j.poly.2022.116100
发表时间：
2022
期刊：
Polyhedron
影响因子：
2.6
作者：
Epshteyn, Albert;Zhang, Yonghui;Fettinger, James C.;Sita, Lawrence R.
通讯作者：
Sita, Lawrence R.

Optical Purity as a Programmable Variable for Controlling Polyolefin Tacticity in Living Coordinative Chain Transfer Polymerization: Application to the Stereomodulated LCCTP of α,ω-Nonconjugated Dienes

光学纯度作为控制活性配位链转移聚合中聚烯烃立构性的可编程变量：在 α,β-非共轭二烯立体调制 LCCTP 中的应用

DOI：
10.1021/acscatal.1c00633
发表时间：
2021
期刊：
ACS Catalysis
影响因子：
12.9
作者：
Wallace, Mark A.;Wentz, Charlotte M.;Sita, Lawrence R.
通讯作者：
Sita, Lawrence R.

Migratory Insertion into a Hafnium–Phenyl Bond and a Ligand-Assisted Mechanism for Reversible Chain Transfer in the Living Coordinative Polymerization of Olefins

烯烃活性配位聚合中铪苯基键的迁移插入和配体辅助的可逆链转移机制

DOI：
10.1021/acs.organomet.2c00364
发表时间：
2022
期刊：
Organometallics
影响因子：
2.8
作者：
Kuzminski, Brendan R.;Fischbach, Danyon M.;Yap, Glenn P.;Sita, Lawrence R.
通讯作者：
Sita, Lawrence R.

Highly Versatile Strategy for the Production of Telechelic Polyolefins

遥爪聚烯烃生产的高度通用策略

DOI：
10.1021/acsmacrolett.2c00108
发表时间：
2022
期刊：
ACS Macro Letters
影响因子：
7.015
作者：
Burkey, Aaron A.;Fischbach, Danyon M.;Wentz, Charlotte M.;Beers, Kathryn L.;Sita, Lawrence R.
通讯作者：
Sita, Lawrence R.