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Conductivity of Oriented Bis‐azo Polymer Films
Author(s) -
Apitz Dirk,
Bertram Ralph Peter,
Benter Nils,
SommerLarsen Peter,
Johansen Per Michael,
Buse Karsten
Publication year - 2006
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200500342
Subject(s) - conductivity , polymer , materials science , chemical engineering , chemistry , composite material , engineering
10.1002/cphc.200500342.abs The conductivity properties of electro‐optic, photoaddressable, dense bis‐azo chromophore polymer films are investigated by using samples corona poled at various temperatures. A dielectric spectrometer is applied to measure the frequency dependence of the conductivity at different temperatures before and after heating the material to above the glass transition temperature. The results show that the orientation of the chromophores changes the charge‐carrier mobility. Ionic conductivity dominates in a more disordered configuration of the material, while the competing process of hole hopping takes over as a transition to a liquid‐crystalline phase occurs when the material is heated to much higher than the glass transition temperature. Such microcrystallization strongly enhances the conductivity.