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Electric field-induced stretch of pyrene-labeled diblock weak polyelectrolyte in dilute solution monitored by steady-state fluorescence

Authors

  • Qian Tan,

    1. Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of Colleges of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China
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  • Xiang Shu,

    1. Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of Colleges of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China
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  • Jie Yi,

    1. Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of Colleges of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China
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  • Hai-Liang Zhang

    Corresponding author
    1. Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of Colleges of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China
    • Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of Colleges of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China
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Abstract

Pyrene-labeled diblock weak polyelectrolyte of poly (2-hydroxyethyl methacrylate)-b-poly (2-(dimethylamino) ethyl methacrylate) (Py-PHEMA-b-PDMAEMA) was successfully synthesized by atom transfer radical polymerization. The behavior of electric field induced diblock polyelectrolyte chain stretch in dilute solution was investigated by steady-state fluorescence spectroscopy. The effect of diblock polyelectrolyte concentration, pH value, salt concentration, and solvent viscosity on electric field-induced stretch was thoroughly investigated by the ratio (IE/IM) of excimer-to-monomer emission intensities obtained from the steady-state fluorescence spectroscopy. The results indicate that the weak diblock polyelectrolyte coil undergoes a stretching process in an external electric field, resulting in the electric field-induced stretch. An increasing polyelectrolyte concentration is advantageous to electric field-induced stretch. The degree of electric field-induced stretch is increased with the decrease of pH value by adding acid. In the presence of NaCl, the degree of electric field-induced stretch is increased with an increasing of salt concentration. However, an increase of solvent viscosity is disadvantageous to electric field-induced stretch. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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