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Proceedings Paper

A photochromic main-chain liquid crystalline polymer and its photo-stimulated actuating properties
Author(s): Myong-Hoon Lee; Hyong J. Choi; Kwang-Un Jeong; Liang-Chy Chien
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Paper Abstract

To explore novel photoresponsive liquid crystalline polymer actuator, a new difunctional photosensitive nematic liquid crystalline monomer was synthesized synthesized in high yield (>60% overall), and polymerized via acyclic diene metathesis polymerization (ADMET) method. Nematic monomer, 4-butoxy-2'-(4-hex-5-enyloxy)-4'-(4-hex-5- enyloxybenzyloxy)-azobenzene, exhibited crystalline to nematic and nematic to isotropic transitions at 85.6 and 98.3 °C, respectively. ADMET polymerization of the monomer using Grubbs catalyst (Gen II) was performed to obtain a high molecular weight polymer. Brown colored free-standing polymer film and fiber were prepared from casting chloroform solution or from drawing polymer melt, respectively. The polymer film showed nematic liquid crystalline property with photosensitive phase transition behavior as observed by polarized microscope and differential scanning calorimetry. The photomechanical deformation of the film and fiber induced by polarized UV irradiation was investigated.

Paper Details

Date Published: 29 January 2008
PDF: 4 pages
Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110B (29 January 2008); doi: 10.1117/12.769009
Show Author Affiliations
Myong-Hoon Lee, Chonbuk National Univ. (South Korea)
Kent State Univ. (United States)
Hyong J. Choi, Chonbuk National Univ. (South Korea)
Kwang-Un Jeong, Chonbuk National Univ. (South Korea)
Liang-Chy Chien, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 6911:
Emerging Liquid Crystal Technologies III
Liang-Chy Chien, Editor(s)

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