Synthesis of side-chain liquid-crystalline polyesters using diethyl malonates with a mesogenic group and oligo(ethylene glycol)s and effect of specific interactions on their mesogenic behavior

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.

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Synthesis of side-chain liquid-crystalline homopolymers and triblock copolymers withp-methoxyazobenzene moieties and poly(ethylene glycol) as coil segments by atom transfer radical polymerization and their thermotropic phase behavior

Journal of Polymer Science Part A Polymer Chemistry ◽

10.1002/pola.10870 ◽

2003 ◽

Vol 41 (18) ◽

pp. 2854-2864 ◽

Cited By ~ 71

Author(s):

Xiaohua He ◽

Hailiang Zhang ◽

Deyue Yan ◽

Xiayu Wang

Keyword(s):

Ethylene Glycol ◽

Atom Transfer Radical Polymerization ◽

Phase Behavior ◽

Radical Polymerization ◽

Liquid Crystalline ◽

Triblock Copolymers ◽

Side Chain ◽

Atom Transfer ◽

Poly Ethylene Glycol ◽

Poly Ethylene

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Synthesis, Characterization And Mesomorphic Properties Of Side Chain Liquid Crystalline Oligomer Having Schiff Base Type Mesogenic Group

Advanced Materials Letters ◽

10.5185/amlett.2014.amwc.1022 ◽

2014 ◽

Vol 5 (6) ◽

pp. 333-338 ◽

Cited By ~ 5

Author(s):

H. E. Gulbas

Keyword(s):

Schiff Base ◽

Liquid Crystalline ◽

Side Chain ◽

Mesogenic Group ◽

Mesomorphic Properties

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

MRS Proceedings ◽

10.1557/proc-425-79 ◽

1996 ◽

Vol 425 ◽

Cited By ~ 1

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.

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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

High Performance Polymers ◽

10.1088/0954-0083/7/3/002 ◽

1995 ◽

Vol 7 (3) ◽

pp. 255-266 ◽

Cited By ~ 3

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.

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