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Chin. Phys., 2005, Vol. 14(2): 306-310    DOI: 10.1088/1009-1963/14/2/015
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Photophysical characteristics of polyaniline with photochromic azobenzene side groups

Huang Kuna, Wan Mei-Xianga, Feng Weib
a Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; b Department of Polymer Materials Science and Engineering, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Abstract  Photochromic characteristics and optical molecular reorientation in conducting polymer such as polyaniline derivatives containing photochromic azobenzene moieties (PAPNPAPOA) in side chain are studied. Changes in the UV—vis absorption, refractive index, thickness, contact angle and morphology of these films after irradiation of a linearly polarized light with a wavelength of 365nm are measured. The trans-cis isomerization of PAPNPAPOA is proved irreversible even after withdrawing the UV light for a long time. That the structure of main-chain attends by the trans-cis isomerization of side-chain is confirmed by the absorption and the solution colour during the UV irradiation. These effects are discussed by taking the trans-cis isomerization of azobenzene into consideration.
Keywords:  trans-cis isomerization      conducting polymer      photochromic azobenzene      polyaniline derivatives     
Received:  08 June 2004      Published:  02 March 2005
PACS:  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
  78.40.Me (Organic compounds and polymers)  
  68.55.-a (Thin film structure and morphology)  
  68.03.Cd (Surface tension and related phenomena)  
  61.80.Ba (Ultraviolet, visible, and infrared radiation effects (including laser radiation))  
  61.82.Pv (Polymers, organic compounds)  
  82.30.Qt (Isomerization and rearrangement)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60307001).

Cite this article: 

Feng Wei, Huang Kun, Wan Mei-Xiang Photophysical characteristics of polyaniline with photochromic azobenzene side groups 2005 Chin. Phys. 14 306

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