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Poling and its relaxation studies of polycarbonate and poly(styrene-co-acrylonitrile) doped by a nonlinear optical chromophore

Authors
Journal
Dyes and Pigments
0143-7208
Publisher
Elsevier
Publication Date
Volume
69
Issue
3
Identifiers
DOI: 10.1016/j.dyepig.2005.03.014
Keywords
  • Pc
  • San
  • Dans
  • Shg
  • Dipole Relaxation
  • Backbond And Heterogeneous Structure
  • Glass Transition And Temporal Stability

Abstract

Abstract Spin-coated films of poly(bisphenol A carbonate) (PC) and poly(styrene- co-acrylonitrile) (SAN) doped by 4-( N, N-dimethylamino)-4′-nitrostilbene (DANS) were prepared, and their poling and depoling behaviors were investigated mainly by UV–visible absorption spectra and second-harmonic generation (SHG). The absorbance of DANS in the PC and SAN films proportionally increased with increasing its weight concentration up to 5 wt%, indicating homogeneous dissolution of DANS in the host polymers. However, above this concentration, heterogeneous structures due to DANS crystallites could be observed under a polarizing microscope. Poling of the films was performed using a triode corona discharging system. The maximum d coefficients were obtained at slightly lower poling temperature than the glass transition temperature of the corresponding dye-doped polymer. The KWW stretched exponential function could be fitted to the experimental temporal relaxation data of SHG for the SAN system. Relatively high long-term stability was observed for the PC system because of its relatively rigid backbone structure.

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