Photo-induced phase transition of side chain liquid crystalline copolymers with photochromic group

Hayashi, Takanori; Kawakami, Hirofumi; Doke, Yasuo; Tsuchida, Akira; Onogi, Yoshihiko; Yamamoto, Masahide

doi:10.1016/0014-3057(94)00134-0

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…The obvious application in optical switching and image storage of this photoinduced phase transition was explained in a Science paper, and the principle is illustrated in Figure While most publications of photoinduced phase transitions used a mesogen similar to the azo unit in 16 , i.e., an oxygen−oxygen substituted azo group, other azo chromophores have been shown to work based on the same principle. Examples are a monosubstituted azo (with oxygen), oxygen-alkyl-substituted azo groups, and even donor−acceptor substituted azobenzenes, starting with oxygen-cyano subtituents . Time-resolved photochemically induced nematic to isotropic phase transitions have been studied on polyacrylates and copolyacrylates containing siloxane spacers, as well as using reflection mode analysis. , A significant improvement in response time (down to 200 μs) has been achieved when the concentration of the azobenzene moiety increased to one per structural unit.…”

Section: Motions At the Domain Levelmentioning

confidence: 99%

Photoinduced Motions in Azo-Containing Polymers

2002

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Section: Motions At the Domain Levelmentioning

confidence: 99%

Photoinduced Motions in Azo-Containing Polymers

2002

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“…Irradiation of an LC trans-azo sample will disrupt the order and induce a phase transition from the ordered LC state to the isotropic phase. This effect enables fast isothermal control of LC phase transitions, [79][80][81][82] even when the azo chromophore is incorporated only to a small extent. 83 This all-optical material response is obviously attractive for a variety of applications, especially for display devices, optical memories, 84 and electro-optics.…”

Section: Azobenzene Photo-switchingmentioning

confidence: 99%

Photo-mechanical effects in azobenzene-containing soft materials

et al. 2007

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The change in shape inducible in some photo-reversible molecules using light can effect powerful changes to a variety of properties of a host material. The most ubiquitous natural molecule for reversible shape change is the rhodopsin-retinal protein system that enables vision, and this is perhaps the quintessential reversible photo-switch. Perhaps the best artificial mimic of this strong photo-switching effect however, for reversibility, speed, and simplicity of incorporation, is azobenzene. This review focuses on the study and application of reversible changes in shape that can be achieved with various systems incorporating azobenzene. This photo-mechanical effect can be defined as the reversible change in shape inducible in some molecules by the adsorption of light, which results in a significant macroscopic mechanical deformation of the host material. Thus, it does not include simple thermal expansion effects, nor does it include reversible but nonmechanical photo-switching or photo-chemistry, nor any of the wide range of optical and electrooptical switching effects for which good reviews exist elsewhere.

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“…[8][9][10] Among them, the combshaped side-chain LCPs with pendant azo groups have been the most extensively investigated materials up to now. 2,[4][5][6][7] To be suited for different application purposes, many sidechain LCPs bearing pendant azo mesogens with different substituents such as hydrogen, 11,12 alkyl, 13,14 perfluoroalkyl, 15 alkyloxy, [16][17][18] chiral alkyloxy, 19,20 nitro, [21][22][23] cyano, 24,25 carboxyl 26 and cinnamoyl group 27,28 have been developed. Among them, the side-chain LCPs bearing azo mesogens with reactive substituting groups are particularly interesting because of their combined properties of liquid crystallinity, photoresponsivity and reactivity.…”

Section: Introductionmentioning

confidence: 99%