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High strength disclinations in liquid crystalline polymers with X-shaped two-dimensional mesogenic units
Textures of liquid crystalline polymers with two-dimensional mesogens have been investigated by using polarizing optical microscopy.Disclinations, strength lSl up to 3/2 and 5/2, were found easily in each sample. Occasionally, even high strength disclination pair can befound. These high strength disclinations are very sable in high temperature although they are energy unfavorable according to the ...
http://www.polymer.cnt//ss/lilei/publicationsshow_1465.html |
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Synthesis and Characterization of Liquid Crystal Polyesters with T-Shaped Two-Dimensional Mesogenic Units(III)
A new series of liquid crystal polyesters with T-shaped two-dimensional mesogenic units were synthesized by melt polycondensation of the diacetates of 2-(4`-alkoxy-phenyl)-hydroquinones with 4,4`-alkylenedioxydibenzoic acid. The polymers were characterized by usin polarized microscopy,DSC and X-ray diffraction.It was relized that all the polymers have nematic thermotropic liquid crystalline charac...
http://www.polymer.cnt//ss/lilei/publicationsshow_1459.html |
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Synthesis and Characterization of Main Chain Aromatic Liquid Crystal Copolyesters with X-Shaped and Rod-Shaped Mesogenic Units
A series of main chain liquid crystal aromatic copolyesters with X-shaped and rod-shaped mesogenic units were synthesized via solution condensation polymerizations of 4,4-(a,w-octanediolyloxy)-dibenzoyl dichlorides with 2,5-bis(p-octanoxy benzoyloxy)-hydroquinene and diphenol. All of the copolyesters showed thermotropic liquid crystalline behaviors through observations using DSC, polarized microsc...
http://www.polymer.cnt//ss/lilei/publicationsshow_1458.html |
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Synthesis and Characterization of Liquid Crystal Polymers with T-Shaped Two-Dimensional Mesogenic Units(II)
A series of liquid crystal polymers(LCPs) with X-shaped two -dimensional mesogenic units has synthesized via low temperature solution polycondensation.The liquid crystalline behaviors of the polymers were characterized using differential scanning calorimetry,polarized microscopy and X-ray diffraction.It was found that all the polymers show nematic thermotropic liquid crystalline characteristics,an...
http://www.polymer.cnt//ss/lilei/publicationsshow_1457.html |
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Synthesis and Characterization of a Series of Liquid Crystal Polymers with X-shaped Two-dimensional Mesogenic Units
A series of liquid crystal polymers (LCPs) with X-shaped two-dimensional mesogenic units has synthesized via low temperature solution polycondensation. The liquid crystalline behaviors of the polymers were characterized using differential scanning calorimetry, polarized microscopy and X-ray diffraction. It was found that all the polymers show nematic thermotropic liquid crystalline characteristics...
http://www.polymer.cnt//ss/lilei/publicationsshow_1456.html |
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Viscoelastic Properties of Polyarylene ether nitriles/Thermotropic Liquid Crystalline Polymer Blend. Journal of Applied Polymer Science, 2008, 108, 1934-1941.
Journal of Applied Polymer Science, 2008, 108, 1934-1941.
ABSTRACT:
Polyarylene ether nitriles (PEN)/thermotropic liquid crystalline polymer (TLCP) blend was prepared via melt mixing. The immiscible phase morphologies, linear and non-linear as well as transient viscoelastic properties of the blend were studied using SEM, rheometer and DMA. The linear dynamic viscoelastic behavior of the blend s...
http://www.polymer.cnt//ss/wudefeng/publicationsshow_1445.html |
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【 Mol. Cryst. Liq. Cryst., 2007, 473, 15-22.】Mesomorphic properties of some liquid crystals with semi-fluorocarbon chains
Haitao Li, Jianxun Wen, Yonggang Yang
Mol. Cryst. Liq. Cryst., 2007, 473, 15-22.
Three series of chiral compounds with semifluorocarbon chains have been synthesized. These compounds were characterized by infra-red spectra (IR), 1H nuclear magnetic resonance (1H NMR), 19F nuclear magnetic resonance (19F NMR), mass spectra (MS), ...
http://www.polymer.cnt//ss/yangyonggang/publicationsshow_966.html |
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【Mol. Cryst. Liq. Cryst., 2007, 469, 51-58.】Synthesis and mesomorphic properties of chiral liquid crystals with semi-perfluorocarbon chains
Yonggang Yang, Haitao Li, Jianxun Wen
Mol. Cryst. Liq. Cryst., 2007, 469, 51-58.
Three series of chiral compounds with semifluorinated chains have been synthesized. These compounds were characterized by IR, 1H NMR, 19F NMR, MS-mass spectrum, and elemental analysis. Their phase-transition behavior was investiga...
http://www.polymer.cnt//ss/yangyonggang/publicationsshow_965.html |
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【Mol. Cryst. Liq. Cryst., 2007, 469, 23-29.】Synthesis and mesomorphic properties of some liquid crystals with semi-fluorocarbon chains
Yonggang Yang, Haitao Li, Jianxun Wen
Mol. Cryst. Liq. Cryst., 2007, 469, 23-29.
Two series of compounds with semifluorinated chains have been synthesized. These compounds were characterized by IR, 1H NMR, 19F NMR, MS, and elemental analysis. Their phase-transition behavior was investigated by differential scanning calorimetry and pola...
http://www.polymer.cnt//ss/yangyonggang/publicationsshow_964.html |
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【Liq. Cryst., 2007, 34, 1167-1174.】The effect of a single atom in the terminal of fluorocarbon chain on liquid crystalline properties
Yonggang Yang, Haitao Li, Jianxun Wen
Liq. Cryst., 2007, 34, 1167-1174.
Eight series of chiral compounds with semi-fluorocarbon chains have been synthesized. The compounds were characterized by IR, 1H NMR, 19F NMR and mass spectroscopies and elemental analysis. Their phase transition behaviour was investigated by differential sca...
http://www.polymer.cnt//ss/yangyonggang/publicationsshow_962.html |
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