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      UV-induced electrical and optical changes in PVC blends

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      Author
      Süzer, Şefik
      Birer, O.
      Sevil, A. U.
      Guven, O.
      Date
      2001
      Source Title
      Monatshefte fur Chemie
      Print ISSN
      0026-9247
      Publisher
      Springer
      Volume
      132
      Issue
      1
      Pages
      185 - 192
      Language
      English
      Type
      Article
      Item Usage Stats
      139
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      118
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      Abstract
      2-Chloro-polyaniline (2-Cl-PANI) in its non-conducting (emeraldine base, EB) form, prepared by a chemical route, was dissolved together with poly-(vinylchloride) (PVC) in THF for casting into thin (10-50 μm) films. Upon exposure to UV radiation, the electrical conductivity of these films increased by more than 4 orders of magnitude (from 10-6 to 10-2 S/cm). This is attributed to the dehydrochlorination of PVC by exposure to energetic photons and subsequent doping of 2-Cl-PANI (i.e. conversion to emeraldine salt, ES) by in situ created HCl. The doped films could be returned to their undoped form by exposure to NH3 vapours. The UV-induced doping/NH3 undoping cycles could be repeated several times. Various spectroscopic techniques were employed to follow the changes in the films upon exposure to UV radiation. The same photo-dehydrochlorination process has also been utilized for optical and/or lithographic purposes by preparing PVC blends containing methyl violet, and acid-base indicator dye. The photo-dehydrochlorination can be effectively sensitized by incorporating hydroquinone into the PVC blends containing methyl violet.
      Keywords
      2 - chloro - polyaniline
      Dehydrochlorination of PVC
      Optical litography
      Photochemical sensitization
      Photochemistry
      Permalink
      http://hdl.handle.net/11693/27610
      Published Version (Please cite this version)
      http://dx.doi.org/10.1007/s007060170158
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