了解和模拟染料分散聚合物混合物的机色学:从原子学的见解到宏观性质
Qinfan Wang1, Alistar Ottochian1, Michele Turelli1
1Theoretical Chemistry and Modeling Team, Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences UMR 8060, 75005, Paris, France.
Journal of molecular modeling
|October 29, 2024
概括
本研究介绍了一种计算方法,用于模拟聚合物混合物中的机色效应. 它模拟了机械应力如何改变染料结构和光学特性,有助于设计智能材料.
科学领域:
- 计算材料科学 计算材料科学
- 聚合物科学 聚合物科学
- 光物理学的光学物理学
背景情况:
- 染料分散聚合物混合物的机色色素反应是由影响光物理性质的分子级结构变化驱动的.
- 了解这些变化对于开发具有可调节光学特性的材料至关重要.
研究的目的:
- 开发和演示一种用于模拟聚合物染料系统中机色反应的计算协议.
- 模拟机械应力,染料的结构变化和光学吸收的变化之间的关系.
主要方法:
- 经典分子动力学 (MD) 模拟被用于模拟聚合物矩阵内的染料分子在异型机械力下的结构重排.
- 为了预测光学反应,比较了两种方法:量子化学计算的统计平均值和涉及几何放松的混合方案.
主要成果:
- 这项研究成功地模拟了在聚乙烯矩阵中的四乙烯衍生物二极体模型系统中的机色色现象.
- 预测的光学吸收变化与染料分子的应力诱导的结构变化相关.
结论:
- 拟议的计算协议准确地捕捉了聚合物混合物中机色反应背后的分子水平机制.
- 这种方法提供了一种可靠的方法,用于预测对机械刺激的响应光学属性调制.
相关概念视频
01:26Polymer Classification: Stereospecificity
2.4K
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...
2.4K
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
01:14Polymer Classification: Architecture
2.6K
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...
2.6K
01:10Polymers: 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
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K