光诱导超分子凝胶向强共价聚合物凝胶的转化。

IF 2.3 3区 化学 Q3 CHEMISTRY, PHYSICAL Chemphyschem Pub Date : 2024-11-04 DOI:10.1002/cphc.202400861
Sabith K Saleem, Thejus Pramod, Pruthvi Kuruva, Shyamkumar V Haridas, Anusha Shanmugam, Madhu Thalakulam, Kana M Sureshan
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引用次数: 0

摘要

我们合成了一种可聚合的二乙炔凝胶剂,其中含有脲基和氨基甲酸乙酯基团,可凝结各种非极性溶剂。凝胶剂分子通过分子间氢键自组装形成非共价聚合物,这一点已在傅立叶变换红外光谱和浓度依赖性 1H NMR 光谱中得到证实。这种自组装使相邻分子的二炔单元位置接近,几何形状适合它们的拓扑化学聚合。紫外线照射凝胶可导致拓扑化学聚合,在凝胶状态下将非共价聚合物原位转化为共价聚合物。利用紫外可见光谱和拉曼光谱对聚二乙烯(PDA)进行表征,证实了这种聚合反应。随时间变化的流变学研究表明,凝胶会随着辐照时间的延长而逐渐增强,这表明聚合度会随着辐照时间的延长而增加。形成的 PDA 是一种半导体,可用于各种用途。
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Light-induced transformation of a supramolecular gel to a stronger covalent polymeric gel.

A polymerizable diacetylene gelator, containing urea and urethane groups, that congeals various non-polar solvents was synthesized. The gelator molecules self-assemble forming non-covalent polymers through intermolecular hydrogen bonding, as evidenced from FT-IR and concentration-dependent 1H NMR spectroscopy. The self-assembly positions the diyne units of adjacent molecules at proximity and in a geometry suitable for their topochemical polymerization. UV irradiation of the gel resulted in topochemical polymerization, transforming the non-covalent polymer to a covalent polymer, in situ, in the gel state. The polymerization was confirmed by characterizing the polydiacetylene (PDA) using UV-Vis and Raman spectroscopy. Time-dependent rheological studies revealed gradual strengthening of the gel with the duration of irradiation, suggesting that the degree of polymerization increases with the duration of irradiation. The PDA formed is a semiconductor, which might be useful for various applications.

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来源期刊
Chemphyschem
Chemphyschem 化学-物理:原子、分子和化学物理
CiteScore
4.60
自引率
3.40%
发文量
425
审稿时长
1.1 months
期刊介绍: ChemPhysChem is one of the leading chemistry/physics interdisciplinary journals (ISI Impact Factor 2018: 3.077) for physical chemistry and chemical physics. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. ChemPhysChem is an international source for important primary and critical secondary information across the whole field of physical chemistry and chemical physics. It integrates this wide and flourishing field ranging from Solid State and Soft-Matter Research, Electro- and Photochemistry, Femtochemistry and Nanotechnology, Complex Systems, Single-Molecule Research, Clusters and Colloids, Catalysis and Surface Science, Biophysics and Physical Biochemistry, Atmospheric and Environmental Chemistry, and many more topics. ChemPhysChem is peer-reviewed.
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