溶液和片的自组装行为,一个由多离子液体组成的块共聚合物和一个响应刺激的弱聚电解质
Kayla Foley1, Keisha B Walters1
1Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States.
ACS omega
|September 25, 2023
概括
一种新型的聚离子液体的区块共聚合物和一种刺激反应的多电解质被合成和特征化. 这种块共聚物表现出独特的网络结构和在聚合物-无机纳米粒子复合材料的潜在应用.
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
- 纳米技术纳米技术
背景情况:
- 原子转移基聚合 (ATRP) 是一种受控聚合技术.
- 聚离子液体 (PIL) 和对刺激有反应的多电解质为先进材料提供了独特的特性.
- 区块共聚合物结合了构成区块的特性,以提供量身定制的功能.
研究的目的:
- 合成和表征一种由多离子液体和对刺激有反应的多电解质组成的新型块共聚合物.
- 研究合成的块共聚合物的聚合控制和超分子相互作用.
- 探索块共聚合物在复合材料中的潜在应用.
主要方法:
- 中介原子转移基聚合 (ATRP) 用于聚合物合成.
- 核磁共振 (NMR) 光谱 (1H NMR,2D DOSY NMR) 用于结构和组成分析.
- 福利埃变换红外光谱 (FTIR) 和动态光散射 (DLS) 用于表征分子间相互作用和聚合行为.
- 原子力显微镜-红外光谱 (AFM-IR) 用于对纳米污染物的形态分析和识别.
主要成果:
- 通过受控的"生命性"聚合物化,成功合成了聚[2- ((dimethylamino) 乙烯甲基酸盐]-块-[poly ((4-vinylbenzyl-3-butylimidazolium bis ((trifluoromethylsulfonyl) imide] (PDMAEMA-b-PVBBImTf2N) 块共聚合物.
- 使用2D DOSY NMR确认块共聚合物形成和连接性.
- 观察溶液中的键和对相互作用,从而形成类似网络的聚合结构.
- 通过AFM-IR,通过添加KNO3和各种形态来证明结构崩.
- 识别与PDMAEMA球体有选择性相互作用的二氧化纳米污染物.
结论:
- 合成的PDMAEMA-b-PVBBImTf2N块共聚合物在散装和溶液状态下表现出受控的架构和独特的超分子行为.
- 块共聚合物形成了一个刺激响应的网络结构,可以通过外部刺激来调节,例如添加盐.
- AFM-IR分析揭示了与无机纳米颗粒的独特形态和选择性相互作用,突出了聚合物-无机复合材料应用的潜力.
更多相关视频
11:42Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
Published on: June 20, 2019
7.9K
07:39Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
Published on: June 8, 2016
9.5K
相关概念视频
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
Characteristics and Nomenclature of Copolymers
2.6K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.6K
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
Anionic Chain-Growth Polymerization: Mechanism
2.1K
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...
2.1K
