聚合物的动力学在粗粒度的阴性溶剂中的聚合物
Zahra K Valei1, Karolina Wamsler1, Alex J Parker2
1School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK. t.shendruk@ed.ac.uk.
Soft matter
|November 15, 2024
概括
液晶中的聚合物由于阴性而延长,导致异性扩散. 这项研究揭示了聚合物形状或形状如何影响动态,即使粘度均.
科学领域:
- 软物质物理学 软物质物理学
- 聚合物科学 聚合物科学
- 生物材料工程 生物材料工程
背景情况:
- 聚合物在生物材料中至关重要,通常与异性质环境相互作用.
- 之前的研究探讨了性溶剂中的聚合物动力学,但往往无法将异型粘度与聚合物延长效应分开.
研究的目的:
- 为了研究阴性对聚合物构成和液晶动态的影响.
- 为了区分聚合物延长和异型粘度对宏分子行为的影响.
主要方法:
- 利用混合的多粒子碰撞动力学和分子动力学模拟技术.
- 捕获了阴性方向,热波动和水力动力学相互作用.
- 研究的聚合物嵌入在具有同位素粘度的无形液晶中.
主要成果:
- 阴性延长了聚合物,甚至在同位体粘度阴性溶剂中也导致了异型扩散.
- 聚合物细分和阴性导体场之间的中间合会诱导头形成.
- 沿着聚合物骨干的发针扩散随着合的增加而呈指数级减速.
结论:
- 仅仅是聚合物构成就能在阴性环境中产生异型动力学.
- 针头结构在调节聚合物动态方面发挥着关键作用,得到了DNA-fd病毒实验的支持.
- 了解聚合物 - 纳米学合可以推动生物模拟复合材料的设计.
相关概念视频
Polymer 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
Polymers: Molecular Weight Distribution
3.3K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.3K
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
Ziegler–Natta Chain-Growth Polymerization: Overview
3.2K
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...
3.2K
Step-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
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


