光致变色
材料科学
螺吡喃
汞菁
光化学
共聚物
光致发光
聚合物
甲基丙烯酸酯
纳米颗粒
吸光度
发光
化学工程
纳米技术
化学
光电子学
工程类
复合材料
色谱法
作者
Guadalupe del C. Pizarro,Wilson Alavia,Karen González,Héctor Díaz,Oscar G. Marambio,Rudy Martin‐Trasanco,Julio Sánchez,Diego P. Oyarzún,Andrónico Neira‐Carrillo
出处
期刊:Polymers
[MDPI AG]
日期:2022-02-26
卷期号:14 (5): 945-945
被引量:5
标识
DOI:10.3390/polym14050945
摘要
Recent progress in the field of photosensitive materials has prompted a need to develop efficient methods to synthesize materials with basic intermolecular architectural designs and novel properties. Accordingly, in this work we design and study a photoactive polymer as a photo-switchable polymeric system in the presence and absence of ZnS nanoparticles (average size < 10 nm) at 5 wt.%. The influence of UV light irradiation on its properties were also studied. The photoactive block copolymer was obtained from styrene (S) and methyl methacrylate (MMA) as monomers and 1-(2-hydroxyethyl)-3,3-dimethylindoline-6-nitrobenzopyran (SP) was grafted to the block copolymer backbone as a photochromic agent. Furthermore, the incorporation of ZnS (NPs) as photo-optical switch component into the system enhances the purple colored photo-emission, with the open form of the spiropyran derivative (merocyanine, MC). The ZnS stabilize the isomeric equilibrium in the MC interconversion of the photochromic agent. The photo-switchable properties of the PS-b-PMMA-SP in the presence of ZnS (NPs) were examined using UV-VIS spectroscopy, Photoluminescence (PL) spectroscopy, optical fluorescence and scanning electronic microscopy (SEM-EDX.). The observed changes in the absorbance, fluorescence and morphology of the system were associated to the reversible interconversion of the two states of the photochromic agent which regulates the radiative deactivation of the luminescent ZnS NPs component. After UV irradiation the photoactive polymer becomes purple in color. Therefore, these basic studies can lead to the development of innovative functional and nanostructured materials with photosensitive character as photosensitive molecular switches.
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