通过多功能易斯对介导聚合控制的拓控制全甲烯酸热塑性弹性体
Chengkai Li1,2, Wuchao Zhao1, Jianghua He1
1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, China, 130012.
Angewandte Chemie (International ed. in English)
|February 23, 2024
概括
现在可以使用新的N-异环烯酸和易斯对合成全甲烯酸triblock热塑性弹性体. 这种方法可实现受控聚合,产生具有增强机械和聚合诱导排放特性的恒星共聚合物.
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
背景情况:
- 合成全甲烯基三块热塑性弹性体 (TPE) 是具有挑战性的,因为不同的单体反应和副作用.
- 现有的方法在复杂的TPE架构中难以控制聚合.
研究的目的:
- 开发一种新的方法来合成全甲烯酸triblock TPE.
- 为了实现对烯酸盐和甲烯酸盐的受控聚合.
- 创建具有可调节拓和增强性质的TPE.
主要方法:
- 基于四乙烯的N-异环烯 (NHOs) 的设计和合成,具有不同的功能组.
- 使用NHO和大型有机化合物形成易斯对 (LPs).
- 使用基于NHO的LP的烯酸盐和甲烯酸盐的活聚合.
主要成果:
- 实现了烯酸盐和甲烯酸盐的活聚合,产生超高分子量聚烯酸盐 (可在4分钟内达到2174kg·mol-1).
- 启用了对聚合物拓 (线性和恒星) 的控制和三块状恒星共聚物的一步合成.
- 在恒星三重块TPE中证明了优越的机械性能 (1863%的延长,19.1MPa的拉伸强度) 和聚合诱导的排放 (AIE).
结论:
- 基于NHO的易斯对为合成先进的全甲烯酸TPE提供了一个多功能平台.
- 开发的方法允许精确控制聚合物结构和特性.
- 由此产生的恒星三块块TPE由于其机械强度和AIE特性,显示出对先进材料应用的巨大潜力.
相关概念视频
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Olefin Metathesis Polymerization: Overview
2.1K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.1K
Step-Growth Polymerization: Overview
3.5K
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...
3.5K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
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...
2.6K
Polymer Classification: Stereospecificity
2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
Free-Radical Chain Reaction and Polymerization of Alkenes
7.8K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.8K


