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Electric field‐induced stretch of pyrene‐labeled diblock weak polyelectrolyte in dilute solution monitored by steady‐state fluorescence
Author(s) -
Tan Qian,
Shu Xiang,
Yi Jie,
Zhang HaiLiang
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38758
Subject(s) - polyelectrolyte , electric field , atom transfer radical polymerization , materials science , fluorescence spectroscopy , pyrene , polymer chemistry , methacrylate , chemistry , polymerization , fluorescence , analytical chemistry (journal) , polymer , organic chemistry , optics , composite material , physics , quantum mechanics
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 ( I E / I M ) 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