scholarly journals Synthesis and Properties of Liquid Crystalline Polyesters with X-shaped Mesogenic Group in Main Chain

2014 ◽  
Vol 25 (1) ◽  
pp. 47-52
Author(s):  
Jong-Ryul Park ◽  
Kuk-Young Cho ◽  
Moon-Soo Bang
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Mesogenic Group

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.

scholarly journals Main-chain liquid crystalline polymers bearing periodically grafted folding elements

2021 ◽  
Vol 12 (7) ◽  
pp. 1050-1059
Author(s):  
Gabriel Ogunsola Orodepo ◽  
E. Bhoje Gowd ◽  
S. Ramakrishnan
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Interesting Alternative

Inclusion of non-mesogenic pendant segments, such as alkyl, PEG and fluoroalkyl, at periodic intervals along the backbone of main-chain LCPs, that contain flexible spacers, provides an interesting alternative to control the mesophase structure and the layer periodicity.

Molecular design of main-chain liquid crystalline polyolefin

2009 ◽  
Author(s):  
Naofumi Naga ◽  
Masato Sone ◽  
Keiichi Noguchi ◽  
Shigemitsu Murase
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Molecular Design
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