单体与前核聚类对比 走向超分子聚合物的多态化
Drishya Elizebath1,2, Sanjay Sharma3, Sunil Varughese1,2
1Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram, Kerala, 695019, India.
Small (Weinheim an der Bergstrasse, Germany)
|November 4, 2024
概括
控制超分子聚合物多态性需要理解核化. 这项研究揭示了溶剂添加如何触发不同的自我组装途径,通过经典或非经典机制导致不同的多态.
科学领域:
- 超分子化学 超分子化学
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
背景情况:
- 超分子聚合物的多态性与它们的形成途径有关.
- 控制多态体需要了解核化机制.
研究的目的:
- 为了研究一个冠二联 (Cr-o-FF OEt) 的自我组装到不同的1D超分子多态.
- 阐明核化路径和溶剂添加在指导自我组装中的作用.
- 区分经典和非经典的聚合机制.
主要方法:
- 一个冠二联的合成 (Cr-o-FF OEt).
- 控制的自组装实验不同溶剂添加模式.
- 使用光学,手术和形态技术进行表征.
- 对核和延长机制的分析.
主要成果:
- 在相同的溶剂组成和度下,从Cr-o-FFOEt中形成了两个稳定的1D超分子多态 (Agg 1和Agg 2f).
- 溶剂添加的模式被确定为竞争性自组装路径的触发因素.
- Agg 1通过经典的核化延长 (以单体为基础) 形成,而Agg 2f通过涉及预先组织的寡合体的非经典途径形成.
- 一种中间体 (Agg 2i) 被分离出来,并被证明可以转化为Agg 1或Agg 2f.
结论:
- 这项研究表明,在高分子聚合物中存在路径依赖的多态性.
- 溶剂添加模式极大地影响自我组装路径和由此产生的多态.
- 前核聚类在1D超分子聚合物中途径选择和多态性的复杂性中发挥着重要作用.
更多相关视频
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
8.1K
11:42Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
Published on: June 20, 2019
7.8K
相关概念视频
01:03Step-Growth Polymerization: Overview
3.4K
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...
3.4K
00:57Cationic 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
02:34Polymers
35.1K
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...
35.1K
01:08Molecular Weight of Step-Growth Polymers
2.2K
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...
2.2K
01:21Polymer Classification: Crystallinity
2.8K
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...
2.8K
01:09Radical 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