Three-Dimensional Photoreorientation of Self-Organized Azobenzene Chromophores in Liquid Crystalline Polymer Films

1999 ◽  
Vol 559 ◽  
Author(s):  
M. Han ◽  
S. Morino ◽  
K. Ichimura
Keyword(s):  
Absorption Spectroscopy ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Critical Role ◽  
Three Dimensional ◽  
Crystalline Polymer ◽  
Infrared Transmission ◽  
Self Organized ◽  
Out Of Plane ◽  
Transmission And Reflection

ABSTRACTPhoto-induced reorientational behavior of films of a liquid crystalline polymer with azobenzene side chains was studied by means of UV-Vis absorption spectroscopy and Fourier transform infrared transmission and reflection-absorption spectroscopy. The incident directions of light for photoisomerization played a critical role in the photocontrol of out-of-plane (three-dimensional) orientation of the azobenzenes in films. Tilted directions of the azobenzene residues were evaluated by using polarized UV-Vis absorption spectra. Photoreoriented states of azobenzene chromophores including photodichroism and tilted alignment were enhanced by successive annealing of photoirradiated films at temperatures close to the glass transition temperature of the polymer.

Self-Organized Anisotropic Wrinkling of Molecularly Aligned Liquid Crystalline Polymer

Langmuir ◽  
2012 ◽  
Vol 28 (7) ◽  
pp. 3576-3582 ◽  
Author(s):  
Seock Hwan Kang ◽  
Jun-Hee Na ◽  
Sung Nam Moon ◽  
Woo Il Lee ◽  
Pil J. Yoo ◽  
...  
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Self Organized

Three-Dimensional Photomobility of Crosslinked Azobenzene Liquid-Crystalline Polymer Fibers

2009 ◽  
Vol 22 (12) ◽  
pp. 1361-1363 ◽  
Author(s):  
Taiki Yoshino ◽  
Mizuho Kondo ◽  
Jun-ichi Mamiya ◽  
Motoi Kinoshita ◽  
Yanlei Yu ◽  
...  
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Three Dimensional ◽  
Crystalline Polymer ◽  
Polymer Fibers

Self-organized wrinkling of liquid crystalline polymer with plasma treatment

2018 ◽  
Vol 33 (23) ◽  
pp. 4092-4100 ◽  
Author(s):  
Jaehyun Sim ◽  
Sihwa Oh ◽  
Se-Um Kim ◽  
Kyuyoung Heo ◽  
Seung-Chul Park ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Self Organized ◽  
Image Position

Abstract

Simulation of Nematic Liquid Crystalline Polymer for Out-of-Plane Case

2011 ◽  
Vol 181-182 ◽  
pp. 51-54
Author(s):  
Shu Fang Fu ◽  
Qiang Zhang ◽  
Qiang Hua Li
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Plane Case ◽  
Initial State ◽  
Molecular Configuration ◽  
Crystalline Polymers ◽  
Out Of Plane ◽  
Simulation Results ◽  
The Magnetic Field

The effect of magnetic fields on the molecular configuration of liquid crystalline polymers (LCPs) under simple shear flows is numerically simulated using the Doi theory when the initial state of the director is out-of-plane. A method of effectively enhance the order parameter is discussed in this paper. The simulation results show that the degree of molecular alignment can be greatly increased along the direction of the magnetic field. It is an efficient way to improve the performance of LCP materials.

scholarly journals Self-organized wrinkling patterns of a liquid crystalline polymer in surface wetting confinement

Soft Matter ◽  
2015 ◽  
Vol 11 (24) ◽  
pp. 4788-4792 ◽  
Author(s):  
Jun-Hee Na ◽  
Se-Um Kim ◽  
Youngjoo Sohn ◽  
Sin-Doo Lee
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Surface Wetting ◽  
Self Organized ◽  
Geometrical Constraints ◽  
Curvature Elasticity ◽  
Reactive Mesogens

Self-organized wrinkling patterns were produced from a solution of reactive mesogens (RMs) in geometrical confinement. The symmetry of the geometrical constraints primarily governs the periodic wrinkling patterns of the RM in the wetting region through the relaxation of the curvature elasticity.

Free Surface Command Layer for Photoswitchable Out-of-Plane Alignment Control in Liquid Crystalline Polymer Films

Langmuir ◽  
2016 ◽  
Vol 32 (3) ◽  
pp. 909-914 ◽  
Author(s):  
Takashi Nakai ◽  
Daisuke Tanaka ◽  
Mitsuo Hara ◽  
Shusaku Nagano ◽  
Takahiro Seki
Keyword(s):  
Free Surface ◽  
Polymer Films ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Out Of Plane

Induction, fixation and recovery of self-organized helical superstructures in achiral liquid crystalline polymer

2021 ◽  
Author(s):  
Tengfei Miao ◽  
Xiaoxiao Cheng ◽  
Haotian Ma ◽  
Wei Zhang ◽  
Xiulin Zhu
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Polymer System ◽  
Crystalline Polymer ◽  
Cross Linking ◽  
Self Organized

A flexible chiral storage based on an achiral polymer system can be successfully achieved by chiral doping and covalent cross-linking.

Observing the relaxation of molecular orientation in sheared liquid crystalline polymer solutions

1990 ◽  
Vol 48 (4) ◽  
pp. 1092-1093
Author(s):  
Wendy Putnam ◽  
Christopher Viney
Keyword(s):  
Molecular Orientation ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Polymer Processing ◽  
Molecular Alignment ◽  
Global Alignment ◽  
Shear Direction ◽  
Axial Strength ◽  
Strength And Stiffness

Liquid crystalline polymers (solutions or melts) can be spun into fibers and films that have a higher axial strength and stiffness than conventionally processed polymers. These superior properties are due to the spontaneous molecular extension and alignment that is characteristic of liquid crystalline phases. Much of the effort in processing conventional polymers goes into extending and aligning the chains, while, in liquid crystalline polymer processing, the primary microstructural rearrangement involves converting local molecular alignment into global molecular alignment. Unfortunately, the global alignment introduced by processing relaxes quickly upon cessation of shear, and the molecular orientation develops a periodic misalignment relative to the shear direction. The axial strength and stiffness are reduced by this relaxation.Clearly there is a need to solidify the liquid crystalline state (i.e. remove heat or solvent) before significant relaxation occurs. Several researchers have observed this relaxation, mainly in solutions of hydroxypropyl cellulose (HPC) because they are lyotropic under ambient conditions.

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