Side chain liquid crystalline polymers with an optically active polynorbornene backbone and achiral mesogenic side groups

2015 ◽  
Vol 6 (29) ◽  
pp. 5281-5287 ◽  
Author(s):  
Bin Geng ◽  
Ling-Xiang Guo ◽  
Bao-Ping Lin ◽  
Patrick Keller ◽  
Xue-Qin Zhang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Optically Active ◽  
Side Chain ◽  
Crystalline Polymers

This work describes a series of side-on and end-on SCLCPs with an optically active polynorbornene main chain and achiral mesogens. The side-on SCLCPs tend to form achiral mesophases, while their comparative end-on analogues exhibit chiral mesophases.

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

Rheology of Liquid-Crystalline Polymers

2007 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Liquid Crystals ◽  
Polymer Chain ◽  
Liquid State ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Point Of View ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Molecular Features

Liquid crystals (LCs) may be divided into two subgroups: (1) lyotropic LCs, formed by mixing rigid rodlike molecules with a solvent, and (2) thermotropic LCs, formed by heating. One finds in the literature such terms as mesomorphs, mesoforms, mesomorphic states, and anisotropic liquids. The molecules in LCs have an orderly arrangement, and different orders of structures (nematic, smectic, or cholesteric structure) have been observed, as schematically shown in Figure 9.1. The kinds of molecules that form LCs generally possess certain common molecular features. The structural characteristics that determine the type of mesomorphism exhibited by various molecules have been reviewed. At present, our understanding of polymeric liquid crystals, often referred to as liquid-crystalline polymers (LCPs), is largely derived from studies of monomeric liquid crystals. However, LCPs may exhibit intrinsic differences from their monomeric counterparts because of the concatenation of monomers to form the chainlike macromolecules. The linkage of monomers inevitably means a loss of their translational and orientational independence, which in turn profoundly affects the dynamics of polymers in the liquid state. These intramolecular structural constraints are expressed in the flexibility of the polymer chain. Generally speaking, the chemical constitution of the monomer determines the flexibility and equilibrium dimensions of the polymer chain (Gray 1962). Figure 9.2 illustrates the variability of chain conformation (flexible chain, semiflexible chain, and rigid rodlike chain) forming macromolecules. Across this spectrum of chain flexibility, the persistence in the orientation of successive monomer units varies from the extreme of random orientation (flexible chains) to perfect order (the rigid rod). Hence, efforts have been made to synthesize LCPs that consist of rigid segments contributing to the formation of a mesophase and flexible segments contributing to the mobility of the entire macromolecule in the liquid state (Ober et al. 1984). From the point of view of molecular architecture, as schematically shown in Figure 9.3, two types of LCP have been developed: (1) main-chain LCPs (MCLCPs), having the monomeric liquid crystals (i.e., mesogenic group) in the main chain of flexible links, and (2) side-chain LCPs (SCLCPs), having the monomeric liquid crystals attached, as a pendent side chain, to the main chain.

Effects of main chain and acceptor content on phase behaviors of hydrogen-bonded main-chain/side-chain combined liquid crystalline polymers

Polymer ◽  
2016 ◽  
Vol 84 ◽  
pp. 355-364 ◽  
Author(s):  
Shuai-Qi Yang ◽  
Wei Qu ◽  
Hong-Bing Pan ◽  
Yu-Dong Zhang ◽  
Shi-Jun Zheng ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Phase Behaviors ◽  
Hydrogen Bonded
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