Development of visible-light driven photo-switching copolymers with pH indicating performance

IF 1.7 4区 工程技术 Q4 POLYMER SCIENCE
Xiaohong Hu , Weiwei Jin , Haitao Zhang , Qinyu Qing , Juan Pang
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引用次数: 0

Abstract

Visible-light-driven azobenzene had been reported by theoretical calculation, but could not be detected by any characterization method due to unstable cis structure. Herein, copolymerization was applied to solve the problem based on a time-dependent characteristic of macromolecular motion. Therefore, two copolymers, namely, MRAA-PEG20 copolymer and MRAA-NIPAM copolymer, were synthesized with a definite segment ratio. Both copolymers had photosensitive groups, which were confirmed by UV-vis spectra. Furthermore, copolymer concentration had a linear relationship with absorbance value at 425 nm. Firstly, blue light as an excitation source to induce the isomerization of copolymers. At the same time, repeated interval irradiation was used to evaluate the fatigue performance of the copolymer. Consequently, both copolymers could quickly transform to their cis isomers upon irradiation, which could be reversible recovered to their trans isomers in operable recovery time after removing irradiation. However, the MRAA-PEG20 copolymer had an obvious photobleaching phenomenon along with the circle index, which did not exist in the MRAA-NIPAM copolymer. Secondly, the effects of excitation light source on isomerization were investigated. It was found that blue light was the most efficient excitation source for both copolymers though other light could also induce trans-to-cis transition. Thirdly, the influence of light intensity and temperature was respectively studied. With increasing of light intensity, the absorbance ratio before and after irradiation monotonously decreased, the irradiation response time shortened and the recovery response time prolonged. Moreover, higher temperature resulted in a higher absorbance ratio, shorter irradiation response time, and shorter recovery response time. Finally, synthesized copolymers had characteristic of pH indicator with a critical point of pH 5.0.

具有pH指示性能的可见光驱动光开关共聚物的研制
通过理论计算已经报道了可见光驱动偶氮苯,但由于其不稳定的顺式结构,任何表征方法都无法检测到。基于大分子运动的时变特性,采用共聚法解决了这一问题。因此,我们以一定的节段比合成了MRAA-PEG20共聚物和MRAA-NIPAM共聚物两种共聚物。两种共聚物均有光敏基团,经紫外可见光谱证实。此外,共聚物浓度与425 nm吸光度值呈线性关系。首先,用蓝光作为激发源诱导共聚物异构化。同时,采用重复间隔辐照法对共聚物的疲劳性能进行了评价。因此,两种共聚物在辐照后都能快速转化为顺式异构体,在去除辐照后可在可操作的恢复时间内可逆地恢复为反式异构体。然而,MRAA-PEG20共聚物有明显的光漂白现象,并伴有圆指数,而MRAA-NIPAM共聚物不存在这种现象。其次,研究了激发光源对异构化的影响。研究发现,蓝光是这两种共聚物最有效的激发源,其他光也可以诱导反式到顺式转变。再次,分别研究了光照强度和温度的影响。随着光强的增加,辐照前后吸光度比单调降低,辐照响应时间缩短,恢复响应时间延长。温度越高,吸收比越高,辐照响应时间越短,恢复响应时间越短。最后,合成的共聚物具有pH指示剂的特性,其临界点为pH 5.0。
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来源期刊
CiteScore
3.50
自引率
5.30%
发文量
37
审稿时长
1.6 months
期刊介绍: The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.
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