Effect of Flexible Spacer Length on the Phase Transitions and Mesophase Structures of Main-Chain Thermotropic Liquid-Crystalline Polyesters Having Bulky Pendent Side Groups†

1997 ◽  
Vol 30 (6) ◽  
pp. 1670-1684 ◽  
Author(s):  
Sukky Chang ◽  
Chang Dae Han
Keyword(s):  
Phase Transitions ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Spacer Length ◽  
Flexible Spacer

Self-organization of cholesterol-side-chain liquid crystalline polymers by tailoring the main chain structure and flexible spacer length

2019 ◽  
Vol 43 (14) ◽  
pp. 5429-5440 ◽  
Author(s):  
Xiwen Yang ◽  
Shaonan Chen ◽  
Hang Luo ◽  
Haoran Xu ◽  
Sheng Chen
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Chain Structure ◽  
Self Organization ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Spacer Length ◽  
Crystalline Polymers ◽  
Smectic A ◽  
Flexible Spacer

Liquid crystal polymers with cholesterol side-chains formed different smectic A phases under the influence of the main-chain structure and flexible spacer length.

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.

Kinetics of phase transitions for fractions of a main-chain liquid-crystalline polyester

Polymer ◽  
1989 ◽  
Vol 30 (2) ◽  
pp. 273-279 ◽  
Author(s):  
Xiaoping Liu ◽  
Shiru Hu ◽  
Lianghe Shi ◽  
Mao Xu ◽  
Qifeng Zhou ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Kinetics Of Phase Transitions ◽  
Kinetics Of ◽  
Liquid Crystalline Polyester
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