- Synthesis and mesophase characterization of novel methacrylate based thermotropic liquid crystalline monomers and their polymers
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A new series of side chain methacrylate monomers with a three phenyl ring core connected by an ester with a terminal alkoxy chain and hexamethylene spacer are synthesized by a multistep synthetic route. The corresponding polymers are realized by free radical solution polymerization. Two structurally similar mesogens are also synthesized for use as models to study the influence of the methacrylic unit on the mesophase characteristics. The molecular structure of the intermediates, monomers as well as the polymers is unambiguously confirmed by Fourier-transform infrared (FT-IR), solution 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and by elemental analysis. The mesophase characteristics of all of the monomers and polymers are determined by hot-stage optical polarized microscopy (HOPM) and differential scanning calorimetry (DSC). These investigations revealed the existence of enantiotropic nematic (N), smectic A (SA) and smectic C (SC) mesophases. Furthermore, for a representative monomer and polymer, the presence of the smectic phase is confirmed by variable temperature X-ray diffraction (XRD) where a characteristic layer ordering is noticed. The molecular weight of the polymers is determined by gel permeation chromatography (GPC) and the values are found to be typically in the range of 2.0 × 103 to 3.7 × 103. The mesogenic polymers are also found to be stable up to 320 °C by thermogravimetric analysis (TGA). the Partner Organisations 2014.
- Siva Mohan Reddy,Narasimhaswamy,Mohana Raju
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p. 4357 - 4364
(2014/12/09)
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- CHARGE TRANSPORT FILM, METHOD FOR PRODUCING THE SAME, AND LIGHT-EMITTING ELEMENT AND PHOTOELECTRIC CONVERSION ELEMENT USING THE SAME
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The present invention provides a charge transport film which is prepared through subjecting a coating film including at least one charge transporting agent to an atmospheric pressure plasma treatment, wherein electron transfer between the charge transport
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- Synthesis and mesomorphism of 1,3-benzenedicarboxylic acid derivatives
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4-Methoxy-l,3-benzenedicarboxylic acid esters and 4-(4- hexyloxybenzoylamino)phenyl 1,3-benzenedicarboxylate, each containing five aromatic rings, were synthesized. The influence of the structure of the synthesized banana-like compounds on their mesogenic activity was examined.
- Novikova,Kilimenchuk,Yarkova,Meshkova,Topilova
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p. 1602 - 1607
(2009/05/06)
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- Ferroelectric and antiferroelectric switching behaviour in new unsymmetrical bent-core compounds derived from 3-hydroxybenzoic acid
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Herein we report the synthesis and characterization of several achiral bent-core unsymmetrical compounds exhibiting mesomorphic properties. The lower homologues in two series of compounds show a columnar phase with a rectangular lattice whereas the middle
- Shreenivasa Murthy,Sadashiva
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p. 2056 - 2064
(2007/10/03)
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- Orientational order in the cholesteric phase of new optically active phenyl benzoates
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Three new optically active phenyl benzoates were synthesized, and their phase behavior was studied by differential scanning calorimetry and optical microscopy. It was established that the obtained substances form more than one crystalline modification, as
- Konstantinov
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p. 1007 - 1010
(2007/10/03)
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- 1,1'-Disubstituted Ferrocene-Containing Thermotropic Liquid Crystals of Structure 5-C5H4)COOC6H4XC6H4OCnH2n+1>2> (X=OOC or COO). Influence of the Orientation of the Central Ester Function on the Mesogenic Properties
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The two series I and II of 1,1'-disubstituted ferrocenes which differ by the direction of the ester function included the rigid organic part were synthesized and their liquid crystal properties examined.These latter were found to be strongly dependent on the orientation of the connecting ester group and on the alkyl chain.
- Deschenaux, Robert,Marendaz, Jean-Luc,Santiago, Julio
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p. 865 - 876
(2007/10/02)
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