scholarly journals Liquid Crystalline π-Conjugated Copolymers Bearing a Pyrimidine Type Mesogenic Group

Materials ◽  
2009 ◽  
Vol 2 (1) ◽  
pp. 22-37 ◽  
Author(s):  
Kohsuke Kawabata ◽  
Hiromasa Goto
Keyword(s):  
Liquid Crystalline ◽  
Mesogenic Group ◽  
Conjugated Copolymers

Liquid Crystalline Side Chain Polymers with Fluorene as Mesogenic Group

1990 ◽  
Vol 193 (1) ◽  
pp. 171-175 ◽  
Author(s):  
G. Kossmehl ◽  
M. Schulz ◽  
H.-M. Vieth ◽  
A. Van Der Est
Keyword(s):  
Liquid Crystalline ◽  
Side Chain ◽  
Mesogenic Group

SIDE CHAIN LIQUID CRYSTAL POLYMERS FOR QUADRATIC NONLINEAR OPTICS

1996 ◽  
Vol 05 (04) ◽  
pp. 735-755 ◽  
Author(s):  
D. GONIN ◽  
B. GUICHARD ◽  
M.C.J. LARGE ◽  
T. DANTAS DE MORAIS ◽  
C. NOËL ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Statistical Models ◽  
Liquid Crystalline ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Mesogenic Group ◽  
Liquid Crystallinity ◽  
Polar Order

In this paper we consider the behavior of a number of side chain liquid crystal polymers having the same mesogenic group and relate their liquid crystalline behavior to their polarization and nonlinear optical properties. We show that the liquid crystallinity of the materials results in an enhancement of the polar order over that of isotropic materials, in qualitative agreement with molecular statistical models.

Synthesis and Physical Properties of π -Conjugated Polymers Containing Mesogenic Group

1996 ◽  
Vol 425 ◽  
Author(s):  
Y. Watanabe ◽  
N. Koide
Keyword(s):  
Aromatic Compound ◽  
Liquid Crystalline ◽  
Oxidation Potential ◽  
Side Chain ◽  
Mesogenic Group ◽  
Scanning Calorimetry ◽  
Polymer Backbone ◽  
Crystalline Polymers ◽  
Lower Oxidation ◽  
Chain Type

AbstractNovel side chain type liquid crystalline polymers, polythiophene and poly(aryleneethynylene) [PAE], containing a mesogenic group in the side chain were synthesized. Polythiophene derivatives were obtained by dehalogenative polycondensation with zero-valence nickel complex under mild condition. PAE type polymers were obtained by coupling dihalo aromatic compound with diethynyl aromatic compound. Their thermal properties were examined by differential scanning calorimetry, optical microscopy and X-ray diffractometry. All polymers exhibited a smectic or nematic mesophase depending upon the polymer backbone and pendant mesogenic group. Polythiophene derivatives exhibited electrochemical activity. Annealing polythiophene derivatives led to a lower oxidation potential and a higher conductivity. The degree of the orientation of the polymer backbone was supported by polarized UV-vis measurement. An effective conjugated length became longer by introducing thiophene rings into the polymer backbone. A high quantum yield of fluorescence was observed for PAE type polymers.

Synthesis and Property of Liquid Crystal Polymers Containing Photosensitive Groups

2011 ◽  
Vol 181-182 ◽  
pp. 131-134
Author(s):  
Ji Lei Li ◽  
Wei Min Zhang ◽  
Yu Lei Zhao ◽  
Jia Ling Pu
Keyword(s):  
Thermal Properties ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Nmr Spectra ◽  
Liquid Crystalline ◽  
Liquid Crystal Polymers ◽  
Crystal Temperature ◽  
Mesogenic Group ◽  
H Nmr ◽  
Ft Ir

The synthesis and free-radical polymerization of the acrylates monomer containing photosensitive chalcone group and the acrylates monomer containing mesogenic group are described in this paper. The monomers and polymers were characterized by FT-IR and 1 H NMR spectra. The thermal properties of polymers were measured by DSC and the liquid crystalline texture was measured by POM. And the results indicated that the polymers showed typical nematic phase and liquid crystal temperature range was 74 °C-103 °C.

Side chain liquid crystalline polymers containing siloxane spacer: 7. Syntheses and properties of polyimides and polyamides containing a mesogenic side chain connected with a disiloxane linkage

1995 ◽  
Vol 7 (3) ◽  
pp. 255-266 ◽  
Author(s):  
Yu Nagase ◽  
Yuriko Takamura ◽  
Eiichi Akiyama
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Catalytic Reduction ◽  
Side Chain ◽  
Mesogenic Group ◽  
Structural Effects ◽  
Siloxane Bond ◽  
Crystalline Polymers ◽  
Aliphatic Group ◽  
Smectic Mesophase

Preparations of polyimides and polyamides containing a mesogenic group in the side chain connected with a siloxane bond in the spacer component were carried out. A 3,5-diaminobenzyloxy-type monomer having a mesogen consisting of a p'-substituted biphenyl benzoate group was prepared by means of hydrosilylation of 1-[3-43,5-dinitrobenzyloxy)propyl]-1,1,3,3-tetramethyldisiloxane with a mesogenic allyloxy compound, followed by catalytic reduction of the two nitro groups. The polyimides were synthesized by polycondensation of the diamine monomers with 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), followed by chemical imidization. The polyamides were also synthesized by polycondensation of the diamine monomers with dicarboxylic dichloride compounds, i.e., terephthaloyl dichloride, oxalyl dichloride, malonyl dichlonride, succinyl dichloride, glutaryI dichloride, adipoyl dichloride, pimeloyI dichloride and azelaoyl dichloride. The structural effects on the thermal properties of the polymers were investigated. The obtained polyamides having an aliphatic group in the main chain exhibited an enantiotropic smectic mesophase at around 100-150C, while no mesophase was observed for the polyimides and a polyamide having an aromatic backbone.

Liquid crystalline copolymers with cholesteryl as mesogenic group

2001 ◽  
Vol 36 (7-8) ◽  
pp. 1455-1461 ◽  
Author(s):  
Daniela Filip ◽  
Cristofor I. Simionescu ◽  
Doina Macocinschi
Keyword(s):  
Liquid Crystalline ◽  
Mesogenic Group
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