Phase Behavior and Molecular Structure of Liquid-Crystalline Polyesters with Flexible Lateral Substituents

1997 ◽  
Vol 30 (15) ◽  
pp. 4247-4253 ◽  
Author(s):  
Pio Iannelli ◽  
Stefania Pragliola ◽  
Antonio Roviello ◽  
Augusto Sirigu
Keyword(s):  
Molecular Structure ◽  
Phase Behavior ◽  
Liquid Crystalline ◽  
Structure Of Liquid

Effect of molecular structure on the phase behavior of some liquid crystalline compounds and their mixtures

2002 ◽  
Vol 391 (1-2) ◽  
pp. 151-158 ◽  
Author(s):  
Magdi M Naoum ◽  
Tayseer Y Labeeb ◽  
E Happ ◽  
H Seliger
Keyword(s):  
Molecular Structure ◽  
Phase Behavior ◽  
Liquid Crystalline

Synthesis and Mesomorphic Properties of Chiral Biphenylol Benzoates

1996 ◽  
Vol 425 ◽  
Author(s):  
Wan-Fang Lu ◽  
Zhi-Yong Zhang ◽  
Yong-Jia Shang
Keyword(s):  
Molecular Structure ◽  
Liquid Crystals ◽  
Phase Behavior ◽  
Liquid Crystalline ◽  
Smectic Liquid Crystals ◽  
Temperature Ranges ◽  
Mesomorphic Properties

AbstractTen new chiral liquid crystalline compounds I1–10 of 4′ -acyl-4-biphenylol (S) -4- (2-methyl-l-butoxy) benzoates were synthesized and their mesomorphic properties were tested. They are all smectic liquid crystals with wide temperature ranges and except for compounds I1, all exhibit a Sc*phase. The influence of molecular structure on phase behavior is discussed.

Solution Properties and Phase Behavior of Ammonium Hexylene Octyl Succinate in Water and Water-Oil System

1970 ◽  
Vol 3 (1) ◽  
Author(s):  
Md. Hamidul Kabir ◽  
Ravshan Makhkamov ◽  
Shaila Kabir
Keyword(s):  
Critical Micelle Concentration ◽  
Phase Behavior ◽  
Liquid Crystalline ◽  
Carbon Number ◽  
Phase Region ◽  
Solution Properties ◽  
Middle Phase ◽  
Two Phase ◽  
Lamellar Liquid Crystal ◽  
Drug Ingredient

The solution properties and phase behavior of ammonium hexylene octyl succinate (HOS) was investigated in water and water-oil system. The critical micelle concentration (CMC) of HOS is lower than that of anionic surfactants having same carbon number in the lipophilic part. The phase diagrams of a water/ HOS system and water/ HOS/ C10EO8/ dodecane system were also constructed. Above critical micelle concentration, the surfactant forms a normal micellar solution (Wm) at a low surfactant concentration whereas a lamellar liquid crystalline phase (La) dominates over a wide region through the formation of a two-phase region (La+W) in the binary system. The lamellar phase is arranged in the form of a biocompatible vesicle which is very significant for the drug delivery system. The surfactant tends to be hydrophilic when it is mixed with C10EO8 and a middle-phase microemulsion (D) is appeared in the water-surfactant-dodecane system where both the water and oil soluble drug ingredient can be incorporated in the form of a dispersion. Hence, mixing can tune the hydrophile-lipophile properties of the surfactant. Key words: Ammonium hexylene octyl succinate, mixed surfactant, lamellar liquid crystal, middle-phase microemulsion. Dhaka Univ. J. Pharm. Sci. Vol.3(1-2) 2004 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

X-ray analysis of the structure of liquid-crystalline copolyesters

1985 ◽  
Vol 79 ◽  
pp. 73 ◽  
Author(s):  
John Blackwell ◽  
Amit Biswas ◽  
Genaro A. Gutierrez ◽  
Robin A. Chivers
Keyword(s):  
Liquid Crystalline ◽  
X Ray ◽  
Structure Of Liquid

Synthesis and Phase Behavior of Side-Group Liquid Crystalline Polymers in Nematic Solvents

2004 ◽  
Vol 37 (10) ◽  
pp. 3569-3575 ◽  
Author(s):  
Michael D. Kempe ◽  
Julia A. Kornfield ◽  
Christopher K. Ober ◽  
Steven D. Smith
Keyword(s):  
Phase Behavior ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Side Group ◽  
Crystalline Polymers

Thermotropic behavior of sodium cholesteryl carbonate

2009 ◽  
Vol 24 (1) ◽  
pp. 156-163 ◽  
Author(s):  
Rabkwan Chuealee ◽  
Timothy S. Wiedmann ◽  
Teerapol Srichana
Keyword(s):  
Phase Behavior ◽  
Chemical Structure ◽  
Liquid Crystalline ◽  
Polarized Light ◽  
Wave Number ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
X Ray Scattering ◽  
C Nmr

Sodium cholesteryl carbonate ester (SCC) was synthesized, and its phase behavior was studied. The chemical structure was assessed by solid-state infrared spectroscopy based on vibration analysis. The wave number at 1705 and 1276 cm−1 corresponds to a carbonyl carbonate and O–C–O stretching of SCC, respectively. Molecular structure of SCC was further investigated with 1H and 13C NMR spectroscopy. The chemical shift, for the carbonyl carbonate resonance appeared at 155.5 ppm. A molecular mass of SCC was at m/z of 452. Differential scanning calorimetry (DSC), video-enhanced microscopy (VEM) together with polarized light microscopy, and small-angle x-ray scattering (SAXS) were used to characterize the phase behavior as a function of temperature of SCC. Liquid crystalline phase was formed with SCC. Based on the thermal properties and x-ray diffraction, it appears that SCC forms a structure analogous to the type II monolayer structure observed with cholesterol esters.

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