响应,结构转移的瓶刷共聚合物颗粒
Sun Ju Kim1, Minjoon Baek1,2, Jinwoo Park1
1Department of Materials Science and Engineering, Soongsil University, Seoul, 06978, South Korea.
Small (Weinheim an der Bergstrasse, Germany)
|May 27, 2025
概括
研究人员开发了新的聚合物颗粒,在对刺激的反应中改变形状. 这种结构转移能力由动态聚合物骨干驱动,使智能软材料具有可调节的光学特性.
科学领域:
- 聚合物科学和材料化学
- 软物质物理学 软物质物理学
- 纳米技术 纳米技术
背景情况:
- 智能软材料需要响应的构建块.
- 控制聚合物颗粒形态对于材料的功能至关重要.
- 动态聚合物架构为刺激响应材料提供了通路.
研究的目的:
- 设计和合成能够进行可逆形态切换的纳米结构聚合物颗粒.
- 研究由动态聚合物骨干驱动的结构转换机制.
- 在光学应用中证明这些结构转移粒子的功能潜力.
主要方法:
- 合成带有动态聚二硫化物骨干的瓶随机共聚物.
- 聚合物在乳液滴中自组合,形成纳米结构的合物.
- 脊柱的刺激诱导的聚合/脱聚合,以推动形态变化.
- 使用电子显微镜和散射技术对粒子结构的表征.
- 结合聚合诱导排放发光剂 (AIEgens) 来探测功能性质.
主要成果:
- 瓶共聚合物在乳液滴中自组装成各种纳米结构 (,圆柱体,球体).
- 聚二硫化骨干的脱聚合诱导了从纳米结构转变为细分化的粒子.
- 通过聚合-脱聚合-再聚合循环实现了可逆形态切换.
- 含有AIEgens的颗粒显示了形态依赖的光发光强度.
结论:
- 通过使用动态瓶共聚合物成功开发了一种新型的结构转移聚合物颗粒.
- 脊柱的聚合/脱聚合提供了一个多功能机制来控制粒子形态.
- 这些对刺激有反应的粒子对智能材料的应用有前途,特别是那些需要可调节光学性能的材料.
相关概念视频
01:14Polymer Classification: Architecture
3.0K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
3.0K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
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...
2.4K
01:21Polymer Classification: Crystallinity
3.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
3.1K
01:26Polymer Classification: Stereospecificity
2.7K
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...
2.7K
01:08Molecular Weight of Step-Growth Polymers
2.3K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.3K
01:04Anionic 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