Qiang Chen,Qian Yang,Pei Gao,Baihong Chi,Jun Nie,Yong He
The photoresponse of the coumarin derivative based on reversible photodimerization and photocleavage has been studied for a long time. This paper reports a novel approach of preparing photoresponsive polymer materials containing coumarin structure by photopolymerization based on the wavelength selectivity. A photopolymerizable and photoresponsive monomer, 7-(hydroxyethoxy)-4-methyl-coumarin (AECM), was synthesized, and photopolymerization was performed on it using UV light irradiation (λ = 405 nm). After polymerization the polymer with coumarin pendant groups can achieve reversible photo-induced [2 + 2] dimerization under UV light (λ > 300 nm) and photocleavage of the cross-link to recovery back to the original structure through further irradiation with UV light (λ = 254 nm). What’s more, this monomer could be used to produce a high-resolution pattern and photo-responsive pressure sensitive adhesive through photopolymerization. The demonstrated approach opens new perspectives for the design of photoresponse materials.
Yuye Yan,Kang Zhang,Luyang Sun,Qinqin Zhang,Yao Meng,Haoran Cheng,Xingrong Zhang,Ruiyang Zhao,Fusheng Liu
Abatract Information storage and security have consistently been critical concerns in modern society, and the advancement of related chemical storage systems continues to present significant challenges. The azobenzene molecule exhibits unique optical properties by changing colour before and after UV irradiation. In this paper, the nanofiber film (AZO-PVDF) has been produced by combining specifically structured azobenzene molecule (3F-Azo) with polyvinylidene fluoride (PVDF) through electrospinning technology. In particular, its potential application in the field of information storage has been attracted attention. Nanofiber films with different compositions have been successfully prepared by precisely controlling the 3F-Azo/PVDF ratio and the rotating speed during electrospinning. The analysis results show that the identification precision of film patterning has been significantly improved by optimizing the 3F-Azo/PVDF ratio. At the same time, the adjustment of the rotating speed could refine the fiber diameter and increase the specific surface area, thereby improving the isomerization property of the films. These nanofiber films show a wide application prospect in the fields of rewritable optical patterns. The research results broaden the scope of application of electrostatic spinning technology for information storage technology, secure printing and smart packaging.
危险品化学品经营许可证（带存储）