Critical behavior of the bend elastic constant of a liquid crystalline comblike polymer near the nematic-smectic A phase transition

1999 ◽  
Vol 20 (10) ◽  
pp. 552-554 ◽  
Author(s):  
Alexander P. Filippov ◽  
Vjacheslav V. Zuev
Keyword(s):  
Phase Transition ◽  
Elastic Constant ◽  
Critical Behavior ◽  
Liquid Crystalline ◽  
Smectic A ◽  
Smectic A Phase

ANISOTROPY OF THE NEMATIC-SMECTIC A PHASE TRANSITION

1995 ◽  
Vol 09 (18n19) ◽  
pp. 2139-2155 ◽  
Author(s):  
BARBARA S. ANDERECK
Keyword(s):  
Phase Transition ◽  
Critical Behavior ◽  
Nematic Phase ◽  
Theoretical Work ◽  
Review Article ◽  
Superconducting Transition ◽  
Work Related ◽  
Smectic A ◽  
Smectic A Phase ◽  
Degree Of Anisotropy

Critical behavior at the transition from the nematic phase to the smectic A phase in liquid crystals has been of interest for over two decades. Discussions about the nature of the transition, its analogy to the superconducting transition, and the degree of anisotropy present in the critical exponents have been extensive during this time. This review article concentrates on the question of anisotropy at the nematic-smectic A transition. The experimental and theoretical work related to this question is summarized and compared. While progress has been made, there are many interesting questions related to this transition that remain for investigators to answer.

Structure and Thermal Behaviour of a Thermotropic Liquid Crystalline Polyimide (PI-LC)

1998 ◽  
Vol 10 (1) ◽  
pp. 147-153 ◽  
Author(s):  
M Tanaka ◽  
M Konda ◽  
M Miyamoto ◽  
Y Kimura ◽  
A Yamaguchi
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Polarized Light ◽  
Isotropic Phase ◽  
X Ray ◽  
Smectic A ◽  
Smectic C ◽  
Smectic A Phase

Anomalous solid structures formed by a thermotropic liquid crystalline polyimide (PI-LC) were investigated by thermal analysis, polarized light microscopy and x-ray analysis. It was revealed that PI-LC should undergo a phase transition from the crystalline to the isotropic phase through the smectic or nematic phase in the temperature range 277–300 °C. The PI-LC filament extruded at 280 °C, at which temperature the polymer was in liquid crystalline phase, was formed to have a structure similar to the smectic C phase, while that extruded and melt-drawn at 310 °C, at which temperature the polymer was in the isotropic phase, had a structure similar to the smectic A phase.

On the critical behavior of the layer compressional elastic constant B at the smectic A-nematic phase transition

1991 ◽  
Vol 33 (1-4) ◽  
pp. 245-247
Author(s):  
M. Benzekri ◽  
J. P. Marcerou ◽  
H. T. Nguyen ◽  
J. C. Rouillon
Keyword(s):  
Phase Transition ◽  
Elastic Constant ◽  
Critical Behavior ◽  
Nematic Phase ◽  
Smectic A

Calorimetric Investigation of the Isotropic to Smectic-A Phase Transition of Smectic Liquid-Crystalline Elastomers

2012 ◽  
Vol 553 (1) ◽  
pp. 193-198 ◽  
Author(s):  
George Cordoyiannis ◽  
Dominic Kramer ◽  
Marta Lavrič ◽  
Heino Finkelmann ◽  
Zdravko Kutnjak
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Calorimetric Investigation ◽  
Smectic A ◽  
Smectic A Phase

Observation of Direct Phase Transition Smectic A ↔ Blue Phase in a Liquid Crystalline Mixed System

1984 ◽  
Vol 39 (7) ◽  
pp. 658-661 ◽  
Author(s):  
H. Onusseit ◽  
H. Stegemeyer
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Differential Scanning Calorimetry ◽  
Liquid Crystalline ◽  
Mixed System ◽  
Scanning Calorimetry ◽  
Smectic A ◽  
Smectic A Phase ◽  
Blue Phase ◽  
Blue Phases

Hithertoo, for all liquid-crystalline samples exhibiting Blue Phases (BP) it has been found that these phases occur between the cholesteric and the isotropic state. In the mixed system of cholesteryl myristate and an azoxybenzene derivative a phase transition from the smectic A phase directly to the BP has been observed. The phase diagram has been obtained by differential scanning calorimetry and is discussed together with the helical pitch behaviour.

Sign in / Sign up

Export Citation Format

Share Document