一种聚苯乙烯荧光微球的制备及发光机理研究

发布时间：2018-01-01 05:15

本文关键词：一种聚苯乙烯荧光微球的制备及发光机理研究　出处：《高分子学报》2016年10期 　论文类型：期刊论文

【摘要】：以聚苯乙烯(PS)微球为基质,与乙酰氯通过Friedel-Crafts反应得到具有荧光性质的乙酰化聚苯乙烯微球(PS-AC).红外光谱(FTIR)分析表明苯环上已成功偶联了乙酰基.我们推测PS-AC微球的荧光现象是由聚苯乙烯分子链中的苯环与羰基双键通过π-π共轭形成的刚性平面结构引起的.为了验证该发光机理,以乙基苯和乙酰氯为原料通过Friedel-Crafts酰基化反应合成了一种与荧光微球发光基团具有相似结构的小分子化学物-对乙基苯乙酮.荧光发射光谱分析表明,对乙基苯乙酮与荧光微球在350~400 nm范围内激发光源的激发作用下都能在400~600 nm范围内产生稳定的荧光发射峰.而紫外-可见吸收光谱表明,与PS微球、乙基苯和乙酰氯相比,PS-AC微球与对乙基苯乙酮在300~400 nm范围内出现了新的吸收带,属于新形成的共轭体系的吸收.这种新的共轭体系可以将微球吸收的紫外光或紫光转变成可见的荧光.以上实验结果表明,本研究制备的荧光微球的发光现象是由苯环π键与羰基双键的共轭作用产生的.
[Abstract]:PS microspheres were used as the matrix. Synthesis of acetylated polystyrene microspheres with fluorescence properties by Friedel-Crafts reaction with acetyl chloride. The results show that acetyl groups have been successfully coupled over benzene ring. We speculate that the fluorescence phenomenon of PS-AC microspheres is caused by the rigid planar structure of benzene ring and carbonyl double bond formed by 蟺-蟺 conjugation in polystyrene molecular chain. To verify the luminescence mechanism. A small molecular chemical, p-ethyl acetophenone, with similar structure to fluorescent microspheres, was synthesized by Friedel-Crafts acylation from ethyl benzene and acetyl chloride. Emission spectrum analysis shows. Both p-ethylacetophenone and fluorescent microspheres can be excited by the excitation light source in the range of 350 ~ 400 nm. A stable fluorescence emission peak was produced in the range of nm, and the UV-Vis absorption spectra showed that the fluorescence emission peak was stable. Compared with PS microspheres, ethylbenzene and acetyl chloride, PS-AC microspheres and p-ethylacetophenone show new absorption bands in the range of 300 ~ 400 nm. This new conjugate system can convert ultraviolet or ultraviolet light absorbed by microspheres into visible fluorescence. The luminescence of the prepared fluorescent microspheres is due to the conjugation of benzene 蟺 bond and carbonyl double bond.
【作者单位】：中国石油大学(华东)生物工程与技术中心;
【分类号】：O632.12
【正文快照】： **通讯联系人,E-mail:jbqu@upc.edu.cn;jianguoliu@upc.edu.cn有机荧光高分子微球是近年来材料科学领域的研究热点,已在多种技术领域特别是生物医学检测领域获得了广泛应用[1].相比于荧光小分子,荧光高分子材料具有生色基团分布均匀、含量稳定、发光性能良好等优点[2~4].高分

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