CAS: Dithioacetal as a Highly Tunable and Versatile Bond for the Design of Chemically Recyclable and Dynamic Covalent Polymers

CAS:二硫缩醛作为高度可调和多功能的键,用于化学可回收和动态共价聚合物的设计

基本信息

项目摘要

With the support of the Macromolecular, Supramolecular and Nanochemistry program in the Division of Chemistry, Ying Yang of the University of Nevada at Reno is using ring-opening and -closing polymerization strategies to prepare recyclable polydithioacetals. Polydithioacetals are long chain macromolecules in which the main polymer backbone contains chemical element sulfur in addition to carbon commonly seen in commodity plastics. This class of polymers is chemically stable and yet has highly modifiable backbones and side groups. As a result, polydithioacetals are promising candidates for recyclable polymers with tunable properties. Research associated with this project will develop an in-depth understanding of the polymerization mechanisms of dithioacetal polymerization, investigate how thermodynamics and kinetics of polymerization are affected by the rich structural variations, and explore using these chemistries to enable dynamic architectural transformations of thermoplastic and thermoset polydithioacetals controlled by stimuli. The results from these fundamental studies have the potential to lead to the development of novel recyclable polymers which can be reprocessed at high temperatures and depolymerized on-demand back into cyclic macrocycles. From the sustainability point of view, the design principle associated with this project provides a very promising and viable solution to the current challenges associated with the widespread usage of non-degradable vinyl plastics. Hence, the developed methodology could be utilized to build readily degradable and sustainable plastics that are amenable to a circular economy life cycle. The research team will be actively involved in disseminating the results via publications and presenting the work at conferences and local events. Furthermore, community outreach will be conducted by establishing close relationships with Hug High School which has a large Hispanic student population. The project will also facilitate the research and education of polymer science at the University of Nevada Reno by integrating polymer chemistry modules into the large general chemistry classes.This research will focus on studying polydithioacetals that are capable of reversible entropy-driven ring-opening polymerization (ED-ROP) and ring-closing depolymerization (RCD) as a versatile platform for the development of recyclable polymers, as well as dynamic covalent systems. The dynamics will be enabled by acid-catalyzed dithioacetal exchange reactions. Building on promising preliminary results, the project aims to develop a detailed understanding of the chemistry and thermodynamics of ED-ROP for dithioacetal macrocycles through three interconnected objectives: (1) understand the polymerization mechanism with different initiator/catalyst systems and obtain controlled “living” cationic polymerization, (2) vary the structures of polydithioacetal backbones and side groups/chains and study their effects on the monomer-polymer equilibrium, and (3) develop reprocessable and depolymerizable polydithioacetal thermosets with controlled degradation by light and mechanical force. These research activities have a strong sustainability component and the potential to generate fundamental chemistry knowledge of relevance to using ED-ROP for the development of inherently practical, recyclable and functional polymers.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.
在化学系大分子、超分子和纳米化学项目的支持下,内华达州大学里诺分校的Ying Yang正在使用开环和闭环聚合策略来制备可回收的聚二硫代缩醛。 聚二硫代缩醛是长链大分子,其中主要聚合物主链除了在商品塑料中常见的碳之外还含有化学元素硫。这类聚合物是化学稳定的,但具有高度可改性的主链和侧基。 因此,聚二硫代缩醛是具有可调性能的可回收聚合物的有希望的候选者。 与该项目相关的研究将深入了解二硫代缩醛聚合的聚合机制,研究聚合的热力学和动力学如何受到丰富的结构变化的影响,并探索使用这些化学物质来实现由刺激控制的热塑性和热固性聚二硫代缩醛的动态结构转变。 这些基础研究的结果有可能导致新型可回收聚合物的开发,这些聚合物可以在高温下再加工,并按需解聚成环状大环。从可持续发展的角度来看,与该项目相关的设计原则为当前广泛使用不可降解乙烯基塑料带来的挑战提供了一个非常有前途和可行的解决方案。 因此,所开发的方法可以用于构建易于降解和可持续的塑料,这些塑料适合循环经济的生命周期。 研究小组将积极参与通过出版物传播研究结果,并在会议和当地活动中介绍研究成果。此外,社区外联将通过与拥有大量西班牙裔学生的拥抱高中建立密切关系来进行。该项目还将促进内华达州里诺大学聚合物科学的研究和教育,将聚合物化学模块整合到大型普通化学课程中。该研究将重点研究能够可逆熵驱动开环聚合(ED-ROP)和闭环解聚(RCD)的聚二硫代缩醛,作为开发可回收聚合物的通用平台,以及动态共价体系。动力学将通过酸催化的二硫代缩醛交换反应来实现。 在有希望的初步结果的基础上,该项目旨在通过三个相互关联的目标详细了解二硫缩醛大环化合物的ED-ROP的化学和热力学:(1)了解不同引发剂/催化剂体系的聚合机理并获得受控的“活性”阳离子聚合,(2)改变聚二硫缩醛骨架和侧基/链的结构并研究它们对单体-聚合物平衡的影响,和(3)开发可再加工和可解聚的聚二硫缩醛热固性材料,其通过光和机械力具有受控的降解。这些研究活动具有很强的可持续性,并有可能产生与使用ED-ROP开发内在实用、可回收和功能性聚合物相关的基础化学知识。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Ying Yang其他文献

Colonization and Gut Flora Modulation of Lactobacillus kefiranofaciens ZW3 in the Intestinal Tract of Mice
开菲拉乳杆菌 ZW3 在小鼠肠道中的定植和肠道菌群调节
  • DOI:
    10.1007/s12602-017-9288-4
  • 发表时间:
    2018-06
  • 期刊:
  • 影响因子:
    4.9
  • 作者:
    Zhuqing Xing;Wei Tang;Ying Yang;Weitao Geng;Rizwan Ur Rehman;Yanping Wang
  • 通讯作者:
    Yanping Wang
The use of high-dose cyclophosphamide, carmustine, and thiotepa plus autologous hematopoietic stem cell transplantation as consolidation therapy for high-risk primary breast cancer after primary surgery or neoadjuvant chemotherapy.
使用大剂量环磷酰胺、卡莫司汀和塞替派联合自体造血干细胞移植作为高危原发性乳腺癌初次手术或新辅助化疗后的巩固治疗。
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    4.3
  • 作者:
    Y. Cheng;G. Rondon;Ying Yang;T. Smith;J. Gajewski;M. Donato;E. Shpall;Roy B. Jones;G. Hortobagyi;R. Champlin;N. Ueno
  • 通讯作者:
    N. Ueno
Room temperature cupric halides mediated olefin alkoxylation of BODIPYs with methanol: mechanisms and scope
室温卤化铜介导的 BODIPY 与甲醇的烯烃烷氧基化:机制和范围
  • DOI:
    10.1039/c9ob02590a
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    3.2
  • 作者:
    Ying Yang;Xiangrong Wei;Yuexing Zhang;Xin Chi;Dejian Huang;Fu Wang;Haixia Wu;Jialin Ming
  • 通讯作者:
    Jialin Ming
The Effects of Input Redundancy in Time Optimal Control
输入冗余对时间最优控制的影响
  • DOI:
  • 发表时间:
    2011
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Zhongxing Peng;Ying Yang;Lin Huang
  • 通讯作者:
    Lin Huang
Phase behaviour and morphology development in a blend of isotactic polypropylene and hydrogenated poly(styrene-co-butadiene)
等规聚丙烯和氢化聚苯乙烯-丁二烯共混物的相行为和形态发展
  • DOI:
    10.1016/s0032-3861(97)00455-2
  • 发表时间:
    1998
  • 期刊:
  • 影响因子:
    4.6
  • 作者:
    N. Otsuka;Ying Yang;H. Saito;Takashi Inoue;Y. Takemura
  • 通讯作者:
    Y. Takemura

Ying Yang的其他文献

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{{ truncateString('Ying Yang', 18)}}的其他基金

CAREER: Mechano-Adaptive Polymers with Reversible Strain Stiffening and Softening via Active Control of Metal-Ligand Interactions
职业:通过主动控制金属-配体相互作用实现可逆应变硬化和软化的机械适应性聚合物
  • 批准号:
    2238935
  • 财政年份:
    2023
  • 资助金额:
    $ 45.16万
  • 项目类别:
    Continuing Grant
Novel in vitro dynamic corneal model with online mechanical characterisation for pharmaceutical screening and tissue engineering applications
用于药物筛选和组织工程应用的具有在线机械表征的新型体外动态角膜模型
  • 批准号:
    BB/F002866/1
  • 财政年份:
    2007
  • 资助金额:
    $ 45.16万
  • 项目类别:
    Research Grant

相似海外基金

SYNTHETIC APPLICATIONS OF CONJUGATED KETENE DITHIOACETAL
共轭烯酮二硫缩醛的合成应用
  • 批准号:
    3291372
  • 财政年份:
    1985
  • 资助金额:
    $ 45.16万
  • 项目类别:
SYNTHETIC APPLICATIONS OF CONJUGATED KETENE DITHIOACETAL
共轭烯酮二硫缩醛的合成应用
  • 批准号:
    3291373
  • 财政年份:
    1985
  • 资助金额:
    $ 45.16万
  • 项目类别:
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