超分子聚合物粘合剂的分子工程,含有封闭的水和单冠以太
Qiangqiang Xu1, Paulina Szymoniak2, Mohamed Aejaz Kolmangadi2
1Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Synergetic Innovation Centre of Biological Optoelectronics and Healthcare Engineering, School of Life Sciences, Northwestern Polytechnical University Xi'an Shaanxi 710072 P. R. China qi@nwpu.edu.cn ge@nwpu.edu.cn.
Chemical science
|January 6, 2025
概括
一种新型的高分子聚合物粘合剂使用封闭的水,保持液态至-80°C. 这种单个单元的宏循环驱动了聚合,并产生了强烈的,低温粘附到表面.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 高分子聚合物是通过非共价相互作用形成的.
- 与散装水相比,封闭式水通常表现出改变的特性.
- 之前的研究表明,对于封闭式水源的产生,需要多个皇冠以太单元.
研究的目的:
- 报告一种新的水诱导的高分子聚合物粘合剂.
- 调查单个含的皇冠乙烯宏循环在限制水中的作用.
- 描述由此产生的超分子聚合物的特性和粘合能力.
主要方法:
- 一个含有的皇冠大循环的合成.
- 一个纳米相分离结构的形成,包含封闭的水.
- 对封闭水的状态和温度依赖导电性的分析.
- 对超分子聚合物对水友表面的粘合强度的评估.
主要成果:
- 一个单个皇冠以太单元成功地限制了水,保持了类似液体的状态到-80°C.
- 封闭的水表现出Vogel-Fulcher-Tammann行为,偏离了典型的阿雷尼乌斯依赖.
- 由此产生的高分子聚合物表现出显著的粘合性能,特别是在低温下对水友表面具有显著的粘合性能.
- 宏环的两性质和纳米相分离对于结构和功能至关重要.
结论:
- 一个单一的小宏观循环可以有效地控制水的结构和功能在超分子系统.
- 这项工作介绍了一种具有独特的低温性能的水诱导超分子聚合物粘合剂的新类.
- 这些发现为设计基于受控水封闭的先进材料打开了道路.
相关概念视频
02:36Crown Ethers
5.1K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
5.1K
00:53Olefin 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
01:20Anionic 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
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
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...
2.2K
02:34Polymers
34.9K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
34.9K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.3K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.3K