同时的旋转涂层和环开放型元解聚合,用于高分子片的快速合成
Zane J Parkerson1, Liudmyla Prozorovska2, Matthew P Vasuta2
1Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States.
ACS applied materials & interfaces
|March 22, 2024
概括
螺旋涂层环开元化聚合 (scROMP) 有效地创建统一的聚合物薄膜. 这种新的方法减少了溶剂的使用,并使薄膜复合膜能够用于诸如乙醇脱水等应用.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 传统的聚合物薄膜合成通常涉及多个步骤和大量的溶剂使用.
- 环开元化聚合 (ROMP) 是一种强大的聚合物合成技术,但对于薄膜制造来说可能具有挑战性.
- 开发综合合成和沉积方法对于高效的材料生产至关重要.
研究的目的:
- 引入一种新的,综合技术,将旋转涂层与ROMP结合起来,用于聚合物薄膜合成.
- 描述螺旋涂层ROMP (scROMP) 方法的性能和制造能力.
- 探索scROMP衍生薄膜在复合膜中用于分离工艺的应用.
主要方法:
- 开发了螺旋涂层ROMP (scROMP) 技术,集成单体沉积和聚合.
- 在各种基板上合成均的聚合物薄膜 (同聚合物和共聚合物).
- 通过旋转速度和单体度来研究薄膜厚度控制.
- 有特征的聚合物分子量和多分散性.
- 为scROMP设计了一种动力模型,以了解过程参数.
主要成果:
- scROMP在不到3分钟的时间内制造大面积 (高达36厘米) 的聚合物薄膜.
- 与传统技术相比,该方法显著降低了溶剂消耗.
- 实现了高分子量 (>100 kDa) 的高分子聚合物,具有较低的多分散性 (<1.2).
- 在多孔和无孔基板上成功形成膜.
- 开发了能够通过蒸发脱水乙醇的薄膜复合膜.
结论:
- scROMP为聚合物薄膜合成和沉积提供了一个高度控制,高效和多功能方法.
- 该技术可以精确控制薄膜厚度和聚合物特性.
- scROMP是制造先进材料的有希望的平台,包括用于分离应用的功能膜.
相关概念视频
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
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
Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
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...
3.3K
Radical Chain-Growth Polymerization: Mechanism
2.5K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.5K
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
Radical Chain-Growth Polymerization: Overview
2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K


