基于支柱[5]的滑环聚合物的构建 /链 主机-客户互动
Liya Chen1,2, Yang Liu1,2, Wei You3
1Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310058, P. R. China.
Angewandte Chemie (International ed. in English)
|October 19, 2024
概括
现在可以在有机溶剂中构建新的滑环聚合物网络,使用支柱[5]arene/alkyl链相互作用. 这一突破将这些先进聚合物的应用范围扩展到水溶性系统之外.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
背景情况:
- 滑环聚合物具有独特的机械性能,对储能和智能传感有价值.
- 目前用于滑环聚合物构造的方法仅限于水相,将其使用限制在水溶性聚合物上.
- 存在需要的战略,使滑环网络形成在有机溶剂中,以利用各种脂性聚合物.
研究的目的:
- 开发一种有效的方法,用于在有机溶剂中构建滑环聚合物网络.
- 探索使用主机-客机交互来实现非水系统中的环轴互锁.
- 创建具有增强机械性能的新型滑动环聚合物架构.
主要方法:
- 利用支柱[5]arene/alkyl链主机-客人相互作用,以促进聚合物相互透.
- 在有机溶剂中合成了两个不同的滑环聚合物网络.
- 描述了合成网络的机械特性,并将它们与共价交联的控制器进行了比较.
主要成果:
- 在有机溶剂中通过宿主-客人相互作用成功构建了两个滑环聚合物网络.
- 一种滑环聚合物表现出一种独特的网络变形机制.
- 与控制网络相比,显著改善了机械性能,包括较高的最大应力,应变和性.
结论:
- 支柱[5]arene/alkyl链主机-客体相互作用为构建有机溶剂中的滑环聚合物提供了一种多功能策略.
- 这种方法克服了以前方法的局限性,使得使用更广泛的聚合物成为可能.
- 开发的滑环聚合物由于其卓越的机械性能,对先进的材料应用具有前途.
相关概念视频
Anionic Chain-Growth Polymerization: Mechanism
2.0K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.0K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.5K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K
Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
Cationic Chain-Growth Polymerization: Mechanism
2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
Step-Growth Polymerization: Overview
3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.4K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K


