Thermal Transition Behavior of Liquid-Crystalline Cholesterol Derivative/Aliphatic Amine Complexes and Enthalpy Relaxation Characteristics in Their Glassy State

A novel class of hydrogen bonding liquid crystalline benzoic acids with alkylthio groups was established and their phase transition behavior was investigated in detail.

Download Full-text

Thermal transition behaviors in a liquid crystalline polyesterimide

Polymer ◽

10.1016/j.polymer.2005.03.090 ◽

2005 ◽

Vol 46 (15) ◽

pp. 5840-5847 ◽

Cited By ~ 6

Author(s):

Zhenguo Chi ◽

Dan Cheng ◽

Xinwei Pan ◽

Yi Zhang ◽

Jiarui Xu ◽

...

Keyword(s):

Liquid Crystalline ◽

Thermal Transition

Download Full-text

Phase Structure Recording in a Nematic Side-Chain Liquid-Crystalline Polymer

Polymers ◽

10.3390/polym12020356 ◽

2020 ◽

Vol 12 (2) ◽

pp. 356 ◽

Cited By ~ 1

Author(s):

Ivan Budagovsky ◽

Aleksey Kuznetsov ◽

Sergey Shvetsov ◽

Mikhail Smayev ◽

Alexander Zolot’ko ◽

...

Keyword(s):

Liquid Crystalline ◽

Modulation Depth ◽

Glassy State ◽

Continuum Theory ◽

Crystalline Polymer ◽

Optical Nonlinearity ◽

Side Chain ◽

Phenyl Benzoate ◽

Chain Polymer ◽

Methylene Groups

Dye-doped nematic side-chain liquid-crystalline polymers possess extraordinary large optical nonlinearity and ability to store the induced orientational deformations in a glassy state, which makes them a very promising material for photonic applications. In this study, the phase structures were generated and recorded in the bulk of a 50-μm layer of a nematic liquid-crystalline side-chain polymer, containing polyacrylate backbone, spacer having five methylene groups, and phenyl benzoate mesogenic fragment. The polymer was doped with KD-1 azodye. The director field deformations induced by the light beam close to the TEM01 mode were studied for different geometries of light–polymer interaction. The phase modulation depth of 2π was obtained for the 18-μm spacing between intensity peaks. The experimental data were analyzed based on the elastic continuum theory of nematics. The possibility to induce and record positive and negative microlenses in the polymer bulk was shown experimentally.

Download Full-text

Impact of low molecular weight excipient octaacetylmaltose on the liquid crystalline ordering and molecular dynamics in the supercooled liquid and glassy state of itraconazole

European Journal of Pharmaceutics and Biopharmaceutics ◽

10.1016/j.ejpb.2014.10.002 ◽

2014 ◽

Vol 88 (3) ◽

pp. 1094-1104 ◽

Cited By ~ 12

Author(s):

E. Kaminska ◽

M. Tarnacka ◽

K. Kolodziejczyk ◽

M. Dulski ◽

D. Zakowiecki ◽

...

Keyword(s):

Molecular Dynamics ◽

Molecular Weight ◽

Liquid Crystalline ◽

Glassy State ◽

Supercooled Liquid ◽

Low Molecular Weight

Download Full-text

Phase Transition Behavior of Main Chain Nematic Liquid-Crystalline Polymers Based on 2-methyl-1,4-bis[4-(4-pentenyloxy)benzoyl]hydroquinone and 2-tert-butyl-1,4-bis[4-(4-pentenyloxy)benzoyl]hydroquinone

MRS Proceedings ◽

10.1557/opl.2012.369 ◽

2012 ◽

Vol 1403 ◽

Author(s):

Christain Melchert ◽

M. Behl ◽

A. Lendlein

Keyword(s):

Phase Transition ◽

Nematic Phase ◽

Liquid Crystalline ◽

Liquid Crystalline Polymers ◽

Phase Transition Behavior ◽

Scanning Calorimetry ◽

Thermal Stabilities ◽

Crystalline Polymers ◽

Transition Behavior ◽

X Ray Scattering

ABSTRACTThe control of phase transition behavior in liquid crystalline polymers could enable potential application in the field of actuators and sensors by enabling a higher actuator performance of liquid crystalline elastomers (LCE). In this context the phase transition behavior of siloxane based liquid crystalline copolymers synthesized from 1,1,3,3-tetramethyldisiloxane, 2-methyl-1,4-bis[4-(4-pentenyloxy)benzoyl]hydroquinone (M-MeHq), and 2-tert-butyl-1,4-bis[4-(4-pentenyloxy)benzoyl]hydroquinone (M-tBHq) was explored. The selected monomers provided different thermal stabilities of the nematic phase, while the non-flexible siloxane spacer suppressed a smectic phase. The mesogenic properties were studied by means of differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and wide angle X-ray scattering (WAXS). With increasing fraction of M-MeHq the nematic phase of the copolymer was stabilized and a tailoring of relatively low TNI was achieved.

Download Full-text