The Sensitivity of Small Molecule Sorption to Annealing in Glassy Liquid Crystalline Polymers

1993 ◽  
Vol 321 ◽  
Author(s):  
Atsushi Morisato ◽  
N. R. Miranda ◽  
J. T. Willits ◽  
G. R. Cantrell ◽  
B. D. Freeman ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Small Molecule ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Higher Order ◽  
Systematic Variation ◽  
Chain Packing ◽  
Crystalline Polymers ◽  
Crystalline Order ◽  
Annealing Conditions

ABSTRACTThe sorption of organic penetrants is found to be sensitive to thermal annealing conditions in a series of glassy, nematic, thermotropic, random copolyesters. Controlled thermal annealing of two polymers in this series permitted a systematic variation of chain packing and, presumably, higher order molecular suprastructure, ranging from a disordered amorphous morphology to More ordered nematic liquid crystalline and semi-crystalline morphologies. The development of liquid crystalline order appears to reduce or preclude small molecule solubility in nematically ordered forms of these polymers.

The design, synthesis and order-enhanced emission of luminescent liquid crystalline polymers based on a “jacketing” effect

2019 ◽  
Vol 10 (46) ◽  
pp. 6342-6349 ◽  
Author(s):  
Ji-Chun Zhu ◽  
Yan Guan ◽  
Zhi-Wang Luo ◽  
Zhen-Xing Li ◽  
Hui-Hong Huang ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Ordered Structures ◽  
Design Synthesis ◽  
Crystalline Polymers

Two resultant luminescent liquid crystalline polymers (LLCPs) show higher emissive efficiency and the polymers form more ordered structures after thermal annealing, which means that an improvement in ordering can enhance emission.

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.

Gas sorption in thermotropic liquid-crystalline polymers

1990 ◽  
Vol 9 (11) ◽  
pp. 1280-1283 ◽  
Author(s):  
C. Carfagna ◽  
E. Amendola ◽  
G. Mensitieri ◽  
L. Nicolais
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Gas Sorption ◽  
Crystalline Polymers ◽  
Thermotropic Liquid Crystalline Polymers
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