Determination of refractive index increment of synthetic polybutadienes and microstructural control of grafting density and liquid crystalline properties

2020 ◽  
Vol 11 (14) ◽  
pp. 2559-2567 ◽  
Author(s):  
Shuai Huang ◽  
Li Han ◽  
Hongwei Ma ◽  
Lan Lei ◽  
Ruixue Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Anionic Polymerization ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Living Anionic Polymerization ◽  
Refractive Index Increment ◽  
Crystalline Polymers ◽  
Grafting Density ◽  
Microstructural Control

Polybutadienes (PBs) with microstructural control of 8% to 94% moles of 1,2-olefins synthesized via living anionic polymerization (LAP) were used as precursors for the synthesis of PB-based liquid crystalline polymers (LCPs) with well-controlled grafting densities.

Effect of grafting density on the self-assembly of side-chain discotic liquid crystalline polymers with triphenylene discogens

Soft Matter ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 375-382
Author(s):  
Mei Wu ◽  
Minqing Gong ◽  
Dongshan Zhou ◽  
Rong Wang ◽  
Dongzhong Chen
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Dissipative Particle Dynamics ◽  
Liquid Crystalline Polymers ◽  
Particle Dynamics ◽  
The Self ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Grafting Density

The self-assembly of triphenylene (TP)-based side-chain discotic liquid crystalline polymers (SDLCPs) with different grafting densities was investigated by using the dissipative particle dynamics (DPD) method.

Microstructural Control in Side Chain Polymers for Optical Applications

1989 ◽  
Vol 175 ◽  
Author(s):  
Rob Findlay ◽  
Tim Lemmon ◽  
Alan Windle
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
X Ray ◽  
Crystalline Polymers ◽  
Chemical Structures ◽  
Polarised Light ◽  
Optical Applications ◽  
Processing Techniques ◽  
Microstructural Control

AbstractCharacterisations of side chain liquid crystalline polymers point towards chemical structures and processing techniques which optimise their suitablility for non-linear optical (NLO) applications. Techniques used are thermal analysis, X-ray and hotstage polarised light microscopy (orthoscopic and conoscopic).

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

Factors affecting microstructural scale in liquid crystalline polymers

1990 ◽  
Vol 48 (4) ◽  
pp. 220-221
Author(s):  
Christine M. Dannels ◽  
Christopher Viney
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Factors Affecting ◽  
Crystalline Polymers ◽  
Thermal Expansion Coefficients ◽  
Low Thermal Expansion ◽  
Lower Viscosity ◽  
Fine Microstructure ◽  
Planar Orientation ◽  
Strength And Stiffness

Processing polymers from the liquid crystalline state offers several advantages compared to processing from conventional fluids. These include: better axial strength and stiffness in fibers, better planar orientation in films, lower viscosity during processing, low solidification shrinkage of injection moldings (thermotropic processing), and low thermal expansion coefficients. However, the compressive strength of the solid is disappointing. Previous efforts to improve this property have focussed on synthesizing stiffer molecules. The effect of microstructural scale has been overlooked, even though its relevance to the mechanical and physical properties of more traditional materials is well established. By analogy with the behavior of metals and ceramics, one would expect a fine microstructure (i..e. a high density of orientational defects) to be desirable.Also, because much microstructural detail in liquid crystalline polymers occurs on a scale close to the wavelength of light, light is scattered on passing through these materials.

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