124249-86-1Relevant academic research and scientific papers
Synthesis and mesophase characterization of novel methacrylate based thermotropic liquid crystalline monomers and their polymers
Siva Mohan Reddy,Narasimhaswamy,Mohana Raju
, p. 4357 - 4364 (2014/12/09)
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.
Ferroelectric and antiferroelectric switching behaviour in new unsymmetrical bent-core compounds derived from 3-hydroxybenzoic acid
Shreenivasa Murthy,Sadashiva
, p. 2056 - 2064 (2007/10/03)
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
Thermotropic liquid crystals from planar chiral compounds: [2.2]Paracyclophane as a mesogen core
Rozenberg, Valeria I.,Popova, Elena L.,Hopf, Henning
, p. 431 - 441 (2007/10/03)
New thermotropic mesomorphic compounds containing a [2.2]paracyclophane (PC) unit were synthesized and investigated (Scheme). Carboxylic acids were selected as the starting PC building blocks. The influence of structural features on the stability of the m
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
Deschenaux, Robert,Marendaz, Jean-Luc,Santiago, Julio
, p. 865 - 876 (2007/10/02)
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.
Ferroelectric liquid crystal compositions chiral haloalkoxy tail units
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, (2008/06/13)
The subject application discloses chiral nonracemic compositions of the general formula: wherein: R1 is an achiral tail of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral or potentially chiral carbon; X is a halide and Y is H or a halide; R2 comprises the distal segment of the chiral tail and has one to ten carbon atoms; the --O--C*H(CH3)--C*HY--C*HY--CH2 --O-- segment comprises the chiral proximal segment of the chiral tail, and the proximal segment is selected from the diastereomers and enantiomers: 1S-methyl-2S-halo 1S-methyl-2R-halo 1R-methyl-2R,3R-dihalo 1R-methyl-2R,3S-dihalo 1R-methyl-2S,3S-dihalo 1R-methyl-2S,3R-dihalo 1R-methyl-2R-halo 1R-methyl-2S-halo 1S-methyl-2S,3S-dihalo 1S-methyl-2S,3R-dihalo 1S-methyl-2R,3R-dihalo 1S-methyl-2R,3S-dihalo.
Molecular Structure and Liquid Crystalline Properties: The Effect of the Terminal Hydroxy Group on Mesomorphic Properties
Sakurai, Y.,Tamatani, A.,Teshima, K.,Kusabayashi, S.,Takenaka, S.
, p. 163 - 172 (2007/10/02)
The thermal properties of 4-hydroxyphenyl 4-(4-alkoxybenzoyloxy)benzoates (1), 4-(4-alkoxyphenoxycarbonyl)phenyl 4-hydroxybenzoates (2), 4-(4-alkoxybenzoyloxy)phenyl 4-hydroxybenzoates (3), 4-hydroxyphenyl 4-(4-alkoxyphenoxycarbonyl)benzoates (4) and some
