荧光光谱法研究PS分子链在不同溶剂中的荧光特性

鲁少林; 方静; 韩栋; 游向前; 刘学清; 刘继延; 胡成龙

荧光光谱法研究PS分子链在不同溶剂中的荧光特性

江汉大学光电化学材料与器件省部共建教育部重点实验室, 湖北武汉 430056

基金项目:

江汉大学博士科研启动项目（项目编号：2012024）

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出版历程
- 收稿日期: 2013-09-17
- 修回日期: 2013-11-14
- 刊出日期: 2013-12-27

Fluorescent Characteristics of Molecular Chains of Polystytene in Different Solvents Studied by Fluorescent Spectrometry

Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China

摘要

摘要: 利用荧光光谱法研究了溶剂和浓度对聚苯乙烯（PS）荧光特性的影响. 研究表明，PS在四氢呋喃溶液中的荧光发射波长为345 nm，其荧光强度达到最大时的饱和浓度为0.1 mg/mL；PS在甲苯溶液中的荧光发射波长为310 nm，其荧光强度达到最大时的饱和浓度为0.075 mg/mL. 造成这种现象的原因在于：四氢呋喃不具荧光性，不与PS分子链中的苯环发生相互作用，而甲苯溶剂自身具有苯环结构，PS和甲苯生色团荧光频率接近，同时PS分子链上苯环与甲苯上的苯环的间距非常小，相邻苯环上的π电子可以互相重叠，形成T型构造的苯环二聚体，使体系的荧光发射峰蓝移至310 nm. 另外，随着PS在溶液中浓度的增大，开始呈线性增加，当浓度大于饱和浓度C^*后，随后其荧光强度呈现非线性下降，这主要是PS在溶剂中形成了二聚体.
- 荧光特性 /
- 二聚体 /
- 能量转移
Abstract: In this paper, the fluorescence characteristics of Polystytene(PS) in tetrahydrofuran and toluene were studied by fluorescence spectrometry and the effect of concentration on the fluorescence properties was also studied. The results showed that the emission wavelength of PS in tetrahydrofuran is 345 nm, with a saturation concentration of fluorescence intensity of 0.1 mg/mL, while the emission wavelength of PS in toluene is 310 nm, and the saturation concentration of fluorescence intensity is 0.75 mg/mL. The reason is: due to the intrinsic property of tetrahydrofuran interaction between tetrahydrofuran and PS do not exist. However, the benzene ring of toluene can strongly interact with the benzene ring of PS to form a T structure dimmer, as a result, the saturation concentration of PS in toluene is less than PS in tetrahydrofuran, and since the fluorescence frequencies of the PS and toluene chromophores are near, when the two groups are close enough, the intrinsic fluorescence emission wavelength of PS blueshifts from 340 nm to 310 nm through energy transfer. In addition, with the increase of the concentration of PS in the solution, the fluorescent intensity increases linearly at the beginning, and when the concentration is raised to higher that the saturation concentration C^*, then the fluorescent intensity decreases nonlinearly, this primarily is because PS dimers are formed in the solvent.
- fluorescence characteristics /
- Dimer /
- energy transfer

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参考文献(16)

Zhang W Z, Chen X D, Yang J, et al. Quantitative description of aggregation and dissociation of polystyrene Chains in cyclohexane solutions by resonance light scattering technique[J]. J Phys Chem B, 2010, 114: 1301–1306.

Zhang L, Su J, Zhang W Z, et al. Temperature-sensitive phase transition of dendritic polyethylene amphiphiles with core-Shell architecture revealed by a rayleigh scattering technique[J]. Langmuir, 2010, 26: 5801–5807.

Yang K, Yang Y Z, Hu C L, et al. Competition between motion constraint and aggregation of macromolecular chains in poly (vinyl methyl ether)/poly(ethylene oxide) aqueous solution during Phase transition[J]. Macromol Chem Phys, 2012, 213: 1735-1741.

Zhou J Y, Yang J, Yang K, et al. Conformational behaviors of syndiotactic polystyrene in chloroform revealed by intrinsic fluorescence technique[J]. Polymer, 2011, 52:3503–3511.

Zhou J Y, Yang J, Hu C L, et al. Structure evolution and kinetics steps of the melting process of thermoreversible polymer gels[J]. Soft Matter, 2011, 7: 5010–5019.

Schmolzer S, Grabner D, Gradzielski M, et al.. Millisecond-range time-resolved small-angle X-ray scattering studies of micellar transformations[J]. Phys Rev Lett, 2002, 88: 258301.

Weiss M, Narayanan T, Wolf C, et al. Dynamics of the self-assembly of unilamellar vesicles[J]. Phys Rev Lett, 2005, 94: 038303.

Kodama T, Ohta A, Toda K, et al. Fluorescence-probe study of vesicle and micelle formations in a binary cationic surfactants system[J]. Colloids Surf A, 2006, 277: 20–26.

Liu R G, Gao X, Adams J, et al. A fluorescence correlation spectroscopy study on the self-diffusion of polystyrene chains in dilute and semidilute solution[J]. Macromolecules, 2005, 38: 8845–8849.

柯以侃, 董慧茹. 分析化学手册(第二版, 第三分册, 光谱分析)[M]. 北京:化学工业出版社, 1998: 462–499.

Wu W B, W M L, Sun Y M, et al. Fluorescent polystyrene microspheres with large Stokes shift by fluorescence resonance energy transfer[J]. J Phys Chem Solids, 2008, 69: 76–82.

Veatch W, Stryer L. The dimeric nature of the gramicidin A transmembrane channel: Conductance and fluorescence energy transfer studies of hybrid channels[J]. J Mol Biol, 1977, 113: 89–102.

Rettig W, Paeplow B, Herbst H, et al. Bouas-Laurent H. Intramolecular excimer formation in short-and long-chainlength di(9-anthryl) bichromophoric compounds and relation to ground state properties[J]. New J Chem, 1999, 23: 453–460.

Claire P D S. Molecular Simulation of Excimer Fluorescence in Polystyrene and Poly(vinylcarbazole)[J]. J Phys Chem B, 2006, 110: 7334–7343.

Luo W A, Chen Y J, Chen X D, et al. Photoinduced Energy Transfer in Poly(trimethylene terephthalate)[J]. Macromolecules, 2008, 41: 3912–3918.

Chung J W, You Y M, Huh H Su, et al. Shear-and UV-induced fluorescence switching in stilbenic π-dimer crystals powered by reversible [2+2] cycloaddition[J]. J Am Chem Soc, 2009, 131: 8163–8172.

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