scholarly journals Investigating the Cusp between the nano- and macro-sciences in supermolecular liquid-crystalline twist-bend nematogens

2017 ◽  
Vol 5 (21) ◽  
pp. 5102-5110 ◽  
Author(s):  
Frank P. Simpson ◽  
Richard J. Mandle ◽  
John N. Moore ◽  
John W. Goodby
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Chemical Structures ◽  
Nematic Mesophase ◽  
Main Chain Polymers

In this article we report the first known linear liquid-crystalline hexamer and in doing so demonstrate that higher oligomers and main chain polymers, with chemical structures based upon dimers and bimesogens, can exhibit the topical twist-bend ‘nematic’ mesophase.

Second order nonlinear optical response of nematic liquid crystalline main chain polymers

1999 ◽  
Vol 101 (1-3) ◽  
pp. 244-245 ◽  
Author(s):  
A.T.H. Koch ◽  
S.V. Fridrikh ◽  
M. Warner ◽  
C.E. Schwarzwälder ◽  
S.C. Moratti ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Nonlinear Optical ◽  
Main Chain ◽  
Optical Response ◽  
Second Order ◽  
Nonlinear Optical Response ◽  
Main Chain Polymers

Synthesis and Characterization of Thermotropic Main-Chain Liquid Crystalline Polysiloxanes Containing 1,4-butylene bi-p-hydroxybenzoate Mesogens

2011 ◽  
Vol 335-336 ◽  
pp. 891-894
Author(s):  
Shuan Li Du ◽  
Jian Feng Gao ◽  
Zhong Zhan Sun ◽  
Jing Yu Wang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Decomposition Temperature ◽  
Chemical Structures ◽  
Flexible Spacer ◽  
Structures And Properties ◽  
Clearing Point ◽  
Ft Ir ◽  
Structural Blocks

1,4-butylene bi-p-hydroxybenzoate (BBHB) was synthesized using methyl p-hydroxyl- benzoate and 1,4-butanediol under catalyst and stabilizer conditions; Then, the thermotropic main- chain liquid crystalline polysiloxanes (MCLCPs) with flexible spacer, were synthesized using BBHB and dimethyldiethoxysilane reagents by melting polycondensation. The chemical structures and properties were characterized by FT-IR, polarized optical microscopy (POM) and differential scanning calorimeter (DSC) respectively. It was found that MCLCPs was the type of smectic A liquid crystal, and the liquid crystal temperature ranged from 58°C to 143°C, i.e. its variationrange reached 85°C. In addition, the polysiloxane was used as the flexible main-chain and the flexible chains CH2 was embedded into the rigid structural blocks of liquid crystalline polymers, which not only decreased the melting point below the thermal decomposition temperature, but also made the clearing point and a stable liquid crystal state observed.

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