Synthesis and photoresponsive behavior of azobenzene-functionalized polythiophene films |
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| Authors: | Xiongyan Zhao Mingzhu Wang |
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| Institution: | a Department of Polymer, College of Material Science and Engineering, Hebei University of Science and Technology, Xinhua Road 505, Shijiazhuang, Hebei 050054, PR China
b Hebei Province Analysis and Testing Research Centre, Hebei University of Science and Technology, 050018 Shijiazhuang, PR China |
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| Abstract: | In this paper, two kinds of azobenzene-functionalized polythiophene liquid-crystalline (LC) polymers with different spacer lengths (n = 6 and 11) were synthesized. The photochromic behaviors and photoresponsive property of these polymer films were investigated by means of spectrofluorophotometer, polarized optical microscope and ARC UV lamp. The results have shown that these liquid-crystalline polythiophene films exhibit a quite fast photochemical phase transition speed and a better opticalswitching property. Furthermore, the existence of the azobenzene moiety in the side chain has also rendered the polythiophene some interesting optical properties that can be modulated by UV light irradiation, e.g., the intensity of photoluminescent emission associated with the conjugated polythiophene main chain was found to decrease upon UV irradiation and the effect becomes more prominent when shorter spacers are used in between the azobenzene group and the main chain. |
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| Keywords: | Photochromic Polythiophenes Trans-cis isomerization Nematic-isotropic phase transition |
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