scholarly journals Exploration of immobilization conditions of cellulosic lyotropic liquid crystals in monomeric solvents by in situ polymerization and achievement of dual mechanochromism at room temperature

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 24724-24730 ◽  
Author(s):  
K. Miyagi ◽  
Y. Teramoto
Keyword(s):  
Liquid Crystals ◽  
Polymer Composites ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
In Situ Polymerization ◽  
Synthetic Polymer ◽  
Lyotropic Liquid Crystals ◽  
Liquid Crystalline Structure ◽  
Cholesteric Liquid Crystalline

We obtained cellulosic/synthetic polymer composites incorporating a cholesteric liquid crystalline structure by in situ polymerization and accomplished dual mechanochromism at room temperature.

Notizen: Frozen Cholesteric Phase of a β-Estradiol Derivative

1987 ◽  
Vol 42 (1) ◽  
pp. 113-114 ◽  
Author(s):  
Carlos Aguilera
Keyword(s):  
Liquid Crystals ◽  
Crystalline Structure ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Polymeric Liquid ◽  
Cholesteric Phase ◽  
Liquid Crystalline Structure ◽  
Polymeric Liquid Crystals

Abstract A new β-estradiol derivative was synthesized. The compound shows LC behaviour (cholesteric phase between 119 and 151 °C). On cooling the LC state, the liquid crystalline structure is preserved. The mesophase persists at room temperature. To our knowledge, such a thermotropic behaviour has only been observed in the case of polymeric liquid crystals.

In situ polymerization of liquid-crystalline thin films of electron-transporting perylene tetracarboxylic bisimide bearing cyclotetrasiloxane rings

RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5474-5484 ◽  
Author(s):  
Kaede Takenami ◽  
Shinobu Uemura ◽  
Masahiro Funahashi
Keyword(s):  
Thin Films ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
In Situ Polymerization ◽  
Columnar Phase

A perylene tetracarboxylic bisimide (PTCBI) derivative bearing four cyclotetrasiloxane rings that forms a columnar phase at room temperature despite the presence of the bulky cyclotetrasiloxane rings and itsin situpolymerization were reported.

Liquid Crystalline Materials for Polymers with Anisotropic Ultrastructures

1989 ◽  
Vol 175 ◽  
Author(s):  
George S. Attard
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Lyotropic Liquid Crystals ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials

AbstractThe in-situ polymerisation of reactive thermotropic and lyotropic liquid crystals affords a method of processing new polymers with anisotropic ultrastructures.

Upconverting Lanthanide-Doped NaYF4−PMMA Polymer Composites Prepared by in Situ Polymerization

2009 ◽  
Vol 21 (10) ◽  
pp. 2010-2012 ◽  
Author(s):  
J. C. Boyer ◽  
N. J. J. Johnson ◽  
F. C. J. M. van Veggel
Keyword(s):  
Polymer Composites ◽  
In Situ Polymerization ◽  
Pmma Polymer

Uv Curable Liquid Crystals and Their Application

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Takatsu ◽  
H. Hasebe
Keyword(s):  
Liquid Crystals ◽  
Light Scattering ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Polymer Network ◽  
Driving Voltage ◽  
Uv Curable ◽  
Good Thermal Stability ◽  
Photo Polymerization ◽  
Smectic A

AbstractSome classes of liquid crystalline monoacrylates having no methylene spacers in a side chain have been prepared. The liquid crystalline monoacrylates have effects to reduce the driving voltage and the hysteresis for a light scattering display of Polymer Network liquid crystals prepared by photo-polymerization-induced phase separation.By photo-polymerization of a chiral monoacrylate monomer in a nematic liquid crystalline host including a black dichroic dye, a polarizer free reflective Spiral Polymer Aligned Nematic (SPAN) Guest Host (GH) LCD exhibiting a low driving voltage has been fabricated. The effect of the spiral polymers made of some kinds of chiral monoacrylates for a Super Twisted Nematic (STN) LCD using SPAN liquid crystals is discussed.UV-curable liquid crystals showing nematic phases at room temperature have been developed. By in situ photo-polymerization, the UV-curable liquid crystals can be utilized for the retardation film with high quality and good thermal stability. The fabrication of various kinds of retardation film using the UV-curable liquid crystals is discussed.UV-curable liquid crystals having isotropic-nematic-smectic A phase sequence have been developed and the photo-polymerization at the state of their uniaxially oriented smectic A phases at room temperature is discussed. The polymerized film is optically uniaxial and transparent without light scattering.

Friction and Rheological Properties of Meso-Porous MCM-41/Unsaturated Polyester In Situ Composites

2014 ◽  
Vol 599-601 ◽  
pp. 18-21
Author(s):  
Shu Long Hu ◽  
Jian Lv ◽  
Feng Ying Lu ◽  
Hua Shan Liu ◽  
De Ming Zeng
Keyword(s):  
Wear Resistance ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Polyester Resin ◽  
In Situ Polymerization ◽  
Unsaturated Polyester ◽  
Roller Milling ◽  
Mcm 41

In this paper, meso-porous MCM-41 was synthesized at room temperature using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template agent. Then MCM-41/unsatura-ted polyester resin (UPR) materials were prepared by in-situ polymerization with the meso-porous MCM-41. MCM-41/UPR in-situ composites were prepared by roller milling and molding processes. Effects of meso-porous MCM-41 on rheological properties and wear resistance of the MCM-41/UPR composites have been investigated. It is shown that MCM-41 has a diameter in range of 4-5 nm and the pores are highly ordered. MCM-41 can improve the rheological properties and wear resistance of the composites. When MCM-41 content is 2%, the mass abrasion loss is decreased by 37.4%.

Controllable Synthesis of Functional Polyaniline Nanotubes via a Complex Template

2015 ◽  
Vol 1120-1121 ◽  
pp. 220-224
Author(s):  
Ying Wang ◽  
Dong Hao Sun ◽  
Yan Feng Guo
Keyword(s):  
Electric Conductivity ◽  
Room Temperature ◽  
In Situ Polymerization ◽  
High Yield ◽  
Controllable Synthesis ◽  
Order Of Magnitude ◽  
Uv Visible ◽  
Acid Orange Ii ◽  
High Electric Conductivity

Functional Polyaniline (PANI) nanotubes are easily synthesized in high yield by an in situ polymerization using a fibrillar complex of acid orange II (AO II) and FeCl3as a template. During the process, the complex templates help direct the growth of fibrillar PANI on their surfaces, resulting in the formation of composite micro/nanofibers of PANI. After polymerization, by the post-treatment of removing templates in 1.0 M hydrochloric acid solution, PANI nanotubes with azo function and high electric conductivity of PANI are readily fabricated. The PANI nanotubes have about 150nm-300nm in diameter and several microns in length. At room temperature, the electric conductivity of PANI nanotubes is up to 10-1S/cm order of magnitude. The characterizations, including FTIR, UV-visible, XRD and TG, are presented.

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