Silicone-based cholesteric liquid crystalline polymers: Effect of crosslinking agent on phase transition behavior

2009 ◽  
Vol 114 (6) ◽  
pp. 3566-3573 ◽  
Author(s):  
Rabindranath N. Jana ◽  
Jae Whan Cho
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Crosslinking Agent ◽  
Liquid Crystalline Polymers ◽  
Phase Transition Behavior ◽  
Crystalline Polymers ◽  
Transition Behavior ◽  
Cholesteric Liquid Crystalline

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

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.

scholarly journals Phase transition behavior of silicone based liquid crystalline polymers

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
R. N. Jana ◽  
H. Bhunia ◽  
C. Im
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Crosslinking Agent ◽  
Transition Temperatures ◽  
X Ray Diffraction ◽  
Phase Transition Behavior ◽  
Scanning Calorimetry ◽  
Dsc Studies ◽  
Transition Behavior ◽  
Ft Ir

AbstractPhase transition behavior of silicone based liquid crystalline (LC) polymers with variable isotropic transition temperatures (Ti), synthesized from poly(methyl hydrosiloxane), 10-undecenoic acid based crosslinking agent and cholesterol based side chain mesogen, was studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD) measurements. The chemical structure of the mesogenic monomer and the LC polymers were confirmed by Fourier transform infra-red (FT-IR) spectroscopy and 1HNMR spectroscopy. DSC studies showed that the glass transition temperatures (Tg) and Ti of the LC polymers decreased with increasing proportion of mesogenic crosslinking agent at its low proportion and at its higher proportion Ti disappeared completely indicating that the polymeric chains had less chance to orient in the network structure. The results were consistent with the XRD and POM studies.

Hydrogen bonding liquid crystalline benzoic acids with alkylthio groups: phase transition behavior and insights into the cybotactic nematic phase

2017 ◽  
Vol 41 (14) ◽  
pp. 6514-6522 ◽  
Author(s):  
Yuki Arakawa ◽  
Yukito Sasaki ◽  
Kazunobu Igawa ◽  
Hideto Tsuji
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Benzoic Acids ◽  
Phase Transition Behavior ◽  
Transition Behavior

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

Development of light-emitting liquid-crystalline polymers with a pentafluorinated bistolane-based luminophore

2020 ◽  
Vol 44 (15) ◽  
pp. 5684-5691 ◽  
Author(s):  
Shigeyuki Yamada ◽  
Akira Mitsuda ◽  
Kaoru Adachi ◽  
Mitsuo Hara ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Liquid Crystalline ◽  
Dynamic Change ◽  
Liquid Crystalline Polymers ◽  
Light Emitting ◽  
Light Blue ◽  
Crystalline Polymers ◽  
Thermal Phase Transition ◽  
Thermal Phase

Light-emitting liquid-crystalline polymers showing PL in the pristine solid state can control their PL color from blue to light-blue via a thermal phase transition to LC phases, which originates from a dynamic change of aggregated structures.

Europium-containing cholesteric liquid crystalline polymers in the side chain

2014 ◽  
Vol 131 (19) ◽  
pp. n/a-n/a
Author(s):  
Wen-Zhi Zhao ◽  
Yue-Hua Cong ◽  
Bao-Yan Zhang ◽  
Wei-Min Gu
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Cholesteric Liquid Crystalline
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