Phase separation and liquid-crystal state of cellulose triacetate in nitromethane

2008 ◽  
Vol 81 (6) ◽  
pp. 1222-1231 ◽  
Author(s):  
A. B. Shipovskaya ◽  
G. N. Timofeeva ◽  
N. O. Gegel’ ◽  
S. Yu. Shchegolev
Keyword(s):  
Liquid Crystal ◽  
Phase Separation ◽  
Cellulose Triacetate ◽  
Crystal State

scholarly journals Phase Analysis of the Cellulose Triacetate-Nitromethane System

2012 ◽  
Vol 2012 ◽  
pp. 1-12
Author(s):  
Anna B. Shipovskaya ◽  
Natalia O. Gegel ◽  
Sergei L. Shmakov ◽  
Sergei Yu. Shchyogolev
Keyword(s):  
Liquid Crystal ◽  
Phase Separation ◽  
Light And Electron Microscopy ◽  
State Diagram ◽  
Cellulose Triacetate ◽  
Cellulose Ester ◽  
Turbidity Spectrum ◽  
Solvent Systems ◽  
Liquid Liquid Phase Separation ◽  
Comprehensive Study

A comprehensive study was made on the cellulose triacetate-nitromethane system to explore its phase separation within ranges 2–25 wt.% and−5÷+80°Cby means of polarization light and electron microscopy, the turbidity spectrum method, differential thermal and X-ray analyses, and rheological techniques. The physical state of the polymer was identified within the phase coexistence boundaries on the phase diagram which included three types of phase separation (amorphous (with a UCST atTcr=57∘Candccr=7.3 wt.%), crystal, and liquid crystal). The boundaries of the regions determining the coexistence of the liquid crystal (LC) and the partly crystal phase were found to be inside the region of amorphous liquid-liquid phase separation. For cellulose ester-solvent systems, this state diagram is the first experimental evidence for the possibility of coexistence of several phases with amorphous, LC, and crystal polymer ordering.

New liquid crystal formation induced by nanoscale phase separation composed of bent-core liquid crystal and rod-like cholesteric liquid crystal mixtures

Soft Matter ◽  
2021 ◽  
Author(s):  
Yoichi Takanishi
Keyword(s):  
Liquid Crystal ◽  
Phase Separation ◽  
Liquid Crystals ◽  
Small Angle ◽  
Cholesteric Liquid Crystal ◽  
Crystal Formation ◽  
Nano Structure ◽  
X Ray ◽  
Nanoscale Phase Separation ◽  
X Ray Scattering

Herein, the local nano-structure in mixtures of cholesteric liquid crystals and a bent-core molecule was analyzed via the small-angle X-ray scattering.

Nano-Sized Fine Droplets of Liquid Crystals for Optical Application

1996 ◽  
Vol 457 ◽  
Author(s):  
Shiro Matsumoto ◽  
Marthe Houlbert ◽  
Takayoshi Hayashi ◽  
Ken-ichi Kubodera
Keyword(s):  
Liquid Crystal ◽  
Phase Separation ◽  
Liquid Crystals ◽  
Electric Field ◽  
Applied Voltage ◽  
Applied Electric Field ◽  
Uv Curing ◽  
Infrared Region ◽  
High Transparency ◽  
Power Change

ABSTRACTNano-sized fine droplets of liquid crystal (LC) were obtained by phase separation of nematic LC in UV curing polymer. The polymer composite had a high transparency in the infrared region. The fine droplets responded to an electric field causing a change in birefringence. Output power change was brought about by the generated retardation between two polarizations, parallel and perpendicular to the applied electric field. This differs from the composite containing much larger droplets, where output depends on the degree of scattering. The birefringence changed by 0.001 at the applied voltage of 7.5 V/μm.

Liquid crystal state of cellulose

1991 ◽  
Vol 33 (1) ◽  
pp. 107-112 ◽  
Author(s):  
A.T. Kalashnik ◽  
S.P. Papkov ◽  
G.V. Rudinskaya ◽  
L.P. Milkova
Keyword(s):  
Liquid Crystal ◽  
Crystal State
Sign in / Sign up

Export Citation Format

Share Document