Lubricant Effect of Flexible Chain in the Photoinduced Motions of Surface-Grafted Liquid Crystalline Azobenzene Polymer Brush

2012 ◽  
Vol 45 (15) ◽  
pp. 6095-6103 ◽  
Author(s):  
Hafiz Ashraful Haque ◽  
Shusaku Nagano ◽  
Takahiro Seki
Keyword(s):  
Liquid Crystalline ◽  
Polymer Brush ◽  
Flexible Chain ◽  
Azobenzene Polymer

High-Density Liquid-Crystalline Azobenzene Polymer Brush Attained by Surface-Initiated Ring-Opening Metathesis Polymerization

Langmuir ◽  
2013 ◽  
Vol 29 (25) ◽  
pp. 7571-7575 ◽  
Author(s):  
Hafiz Ashraful Haque ◽  
Soutarou Kakehi ◽  
Mitsuo Hara ◽  
Shusaku Nagano ◽  
Takahiro Seki
Keyword(s):  
Ring Opening ◽  
Liquid Crystalline ◽  
Polymer Brush ◽  
High Density ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Azobenzene Polymer

scholarly journals High-Efficiency Responsive Smart Windows Fabricated by Carbon Nanotubes Modified by Liquid Crystalline Polymers

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 440
Author(s):  
Yuan Deng ◽  
Shi-Qin Li ◽  
Qian Yang ◽  
Zhi-Wang Luo ◽  
He-Lou Xie
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystalline ◽  
Near Infrared ◽  
High Efficiency ◽  
Polymer Brush ◽  
Light Transmittance ◽  
Smart Window ◽  
Vertical Orientation ◽  
Smart Windows ◽  
Conversion Materials

Smart windows can dynamically and adaptively adjust the light transmittance in non-energy or low-energy ways to maintain a comfortable ambient temperature, which are conducive to efficient use of energy. This work proposes a liquid crystal (LC) smart window with highly efficient near-infrared (NIR) response using carbon nanotubes grafted by biphenyl LC polymer brush (CNT-PDB) as the orientation layer. The resultant CNT-PDB polymer brush can provide the vertical orientation of LC molecules to maintain the initial transparency. At the same time, the smart window shows a rapid response to NIR light, which can quickly adjust the light transmittance to prevent sunlight from entering the room. Different from common doping systems, this method avoids the problem of poor compatibility between the LC host and photothermal conversion materials, which is beneficial for improving the durability of the device.

scholarly journals Optical Input/Electrical Output Memory Elements based on a Liquid Crystalline Azobenzene Polymer

2016 ◽  
Vol 8 (10) ◽  
pp. 6563-6569 ◽  
Author(s):  
Thomas Mosciatti ◽  
Sara Bonacchi ◽  
Marco Gobbi ◽  
Laura Ferlauto ◽  
Fabiola Liscio ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Azobenzene Polymer ◽  
Electrical Output

scholarly journals Synthesis and Characterization of Photoluminescence Liquid Crystals Based on Flexible Chain-Bearing Pentafluorinated Bistolanes

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 603
Author(s):  
Shigeyuki Yamada ◽  
Masaya Sato ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Oxygen Atom ◽  
Liquid Crystalline ◽  
Color Change ◽  
Photophysical Properties ◽  
Structure Property ◽  
Flexible Chain ◽  
Structure Property Relationships ◽  
Chiral Nematic

The liquid-crystalline (LC) and photophysical properties of molecules are very sensitive to their electronic and molecular aggregate structures. Herein, to shed light on the structure–property relationships of pentafluorinated bistolane-based photoluminescence (PL) liquid crystals (PLLCs) previously reported by our group, we synthesized pentafluorinated bistolanes with variable flexible chains and evaluated their LC and photophysical properties. The incorporation of an oxygen atom (to afford a 2-methoxyethoxy unit) or an oxygen atom and a methyl group (to afford a 1-methoxyprop-2-oxy unit) into the flexible butoxy chain significantly decreased the temperature of the crystalline-to-LC phase transition, and a chiral nematic phase comprising helical molecular aggregates was observed for the chiral 1-methoxyprop-2-oxy group–bearing bistolane. The synthesized bistolanes exhibited strong blue PL in both solution and crystalline phases; the featuring PL characteristics were maintained in the LC phase (produced by the crystalline-to-LC phase transition) except for a slight PL color change. Thus, it was concluded that the PL behavior of pentafluorinated bistolanes can be modulated by the choice of a suitable flexible chain, and the obtained insights are believed to facilitate the application of PLLCs in thermosensing PL materials.

The Effect of Hydrogen Bonding on the Mesomorphic Properties for Side Chain Type Liquid Crystalline Polyurethanes

1996 ◽  
Vol 425 ◽  
Author(s):  
T. Mihara ◽  
N. Koide
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystalline ◽  
Side Chain ◽  
Flexible Chain ◽  
Remarkable Change ◽  
Polymer Backbone ◽  
Phase Transition Temperatures ◽  
Ft Ir ◽  
Mesomorphic Properties ◽  
Chain Type

AbstractMesomorphic properties and temperature dependence of the hydrogen bonding between urethane bonds (H-bonding) for side chain type liquid crystalline polyurethane(SLCPU)s were studied by thermally controlled FT-IR spectroscopy. A remarkable change in the strength of H-bonding for SLCPUs with a flexible chain in the polymer backbone(flexible SLCPUs) was displayed near the phase transition temperatures, while small changes in the strength of H-bonding for SLCPUs with a rigid moiety in the polymer backbone(rigid SLCPUs) was influenced by a mesogenic group in the side chain and the flexible chain length in the polymer backbone. Furthermore, in order to study the influence of H-bonding in rigid SLCPUs, polyurethane derivatives with methyl group were synthesized replacing hydrogen in urethane bonds. No mesomorphic properties for polyurethane derivatives obtained were exhibited. It was concluded that H-bonding played an important role to exhibit mesomorphic properties of rigid SLCPUs.

Thermomechanical Properties and Morphology of Liquid Crystalline Polyurethane/Epoxy Resin Composites

2011 ◽  
Vol 194-196 ◽  
pp. 1421-1425 ◽  
Author(s):  
Jian Feng Ban ◽  
Shao Rong Lu ◽  
Dong Guo ◽  
Kuo Liu ◽  
Chong Xi Luo
Keyword(s):  
Epoxy Resin ◽  
Liquid Crystalline ◽  
Decomposition Temperature ◽  
Thermomechanical Properties ◽  
Resin Composites ◽  
Flexible Chain ◽  
Polyurethane Elastomers ◽  
Fracture Feature ◽  
Epoxy Resin Composites ◽  
The Impact

One new kind of epoxy resin toughening agent defined as liquid crystalline polyurethane elastomers (LCPUE) containing mesogenic ester groups and trithylene glycol flexible chain was synthesized and its nematic structure was observed by POM and XRD. The LCPUE was to modify the epoxy resin (E-51). The mechanical properties, fracture surface morphology, and thermal properties of the E-51/LCPUE curing system were systematically investigated. Experimental results revealed that the impact strength of the epoxy resin modified with LCPU is 1.9 times higher than that of the unmodified system, enhanced the thermal decomposition temperature by about 12 °C, and the fracture surfaces all modified systems display tough fracture feature.

Synthesis and Characterization of Biphenylnate Liquid Crystalline Polyurethanes

2010 ◽  
Vol 428-429 ◽  
pp. 158-161 ◽  
Author(s):  
Jian Feng Ban ◽  
Shao Rong Lu ◽  
Chen Xi Zhang
Keyword(s):  
Transition Temperature ◽  
Melting Point ◽  
Diethylene Glycol ◽  
Liquid Crystalline ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Flexible Chain ◽  
Ft Ir ◽  
Thermotropic Properties

A series of novel biphenylnate liquid crystalline polyurethanes (BLCPs) were synthesized by polyaddition reaction of 4,4’-dihydroxybiphenyl with 2,4-TDI(2,4-toluenediisocyanate) and diethylene glycol through changing the molar ratio of diphenol and diol. The thermotropic properties, the melting point (Tm) and the isotropization temperature (Ti) of the synthesized polyurethanes were characterized by FT-IR, DSC, POM and WXRD. The results of experiments showed that all of the polyurethane polymers exhibited thermotropic liquid crystalline properties between 130°C and 230°C. The transition temperature (Tm and Ti) decreased with an increase in the length of the flexible chain.

Highly Photosensitive Surface Relief Gratings Formation in a Liquid Crystalline Azobenzene Polymer:  New Implications for the Migration Process

2007 ◽  
Vol 40 (13) ◽  
pp. 4607-4613 ◽  
Author(s):  
Nobuyuki Zettsu ◽  
Toshinobu Ogasawara ◽  
Ryusuke Arakawa ◽  
Susaku Nagano ◽  
Takashi Ubukata ◽  
...  
Keyword(s):  
Surface Relief ◽  
Liquid Crystalline ◽  
Migration Process ◽  
Azobenzene Polymer ◽  
Surface Relief Gratings
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