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.

Effects of rigid cores and flexible tails on the phase behaviors of polynorbornene-based mesogen-jacketed liquid crystalline polymers

2015 ◽  
Vol 6 (44) ◽  
pp. 7701-7710 ◽  
Author(s):  
Zhen-Yu Zhang ◽  
Qian Wang ◽  
Ping-Ping Hou ◽  
Zhihao Shen ◽  
Xing-He Fan
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Liquid Crystalline Phase ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Phase Behaviors

MJLCPs with a polynorbornene main chain and different side groups have been precisely synthesized for investigating the effect of side-chain structures on the liquid crystalline phase behaviors.

X-ray investigation of combined main-chain/side-chain liquid-crystalline polymers

1990 ◽  
Vol 7 (5) ◽  
pp. 721-729 ◽  
Author(s):  
S. Diele ◽  
M. Naumann ◽  
F. Kuschel ◽  
B. Reck ◽  
H. Ringsdorf
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
X Ray ◽  
Crystalline Polymers

Melt Diffusion in Model Liquid Crystalline Polyiers

1991 ◽  
Vol 248 ◽  
Author(s):  
E. Hall ◽  
C.K. Ober ◽  
E.J. Kramer ◽  
R.H. Colby ◽  
J.R. Gillmor ◽  
...  
Keyword(s):  
Nematic Phase ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Tracer Diffusion ◽  
Side Chain ◽  
Viscosity Data ◽  
Tracer Diffusion Coefficient ◽  
Crystalline Polymers ◽  
Model Liquid ◽  
Matrix Layer

AbstractDiffusion of model main-chain and side-chain liquid crystalline polymers was studied in the nematic phase. The concentration of deuterium labeled polymer vs. depth in a thick matrix layer was profiled with Forward Recoil Spectrometry to determine diffusion coefficients. In each system, the tracer diffusion coefficient was measured as a function of temperature, and correlated both with phase transitions determined by thermal analysis and with melt viscosity data.

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.

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