- Synthesis and characterization of block copolymers of polystyrene and thermotropic liquid crystalline polyesters
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A series of block copolymers containing a thermotropic liquid crystalline polymer and an amorphous polystyrene have been synthesized. The block copolymers were prepared by solution polycondensation of α,ω-dicarboxylic acid-terminated polystyrene with 4,4′-dicarboxy-1,6-diphenoxy-hexane and 4,4′-bis(2-hydroxyalkyloxy)biphenyls in a mixture of triphenylphosphine, hexachloroethane, and pyridine. The obtained polymers were fractionated to isolate the pure block copolymer. The block copolymers were characterized by FTIR spectroscopy, differential scanning calorimetry, thermogravimetric analysis, optical polarizing microscopy measurement. Optical polarizing microscopy measurements verify the presence of a smectic liquid crystalline phase for the block copolymers. The block copolymers represent a microphase-separated morphology, i.e., both amorphous and liquid crystalline properties were displayed by the polystyrene and liquid crystalline polyester segments respectively.
- Chen, Cheng-Chih,Lin, Chih-Hung
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p. 125 - 133
(2018/03/21)
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- Bent-core dimesogenic compound and method for preparing thereof
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The present invention refers to nuclear - manufacturing method relates to compounds and their [...] Image frame adjustment equipment of vehicles for farming, more specifically 5 has-substituted benzene two, the substituted with fluorine-substituted benzen
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- Biological evaluation of bisbenzaldehydes against four Mycobacterium species
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A series of bisbenzaldehydes and structurally related analogs, conveniently synthesized via microwave-assisted reactions, were evaluated in vitro against drug susceptible and multi-drug resistant Mycobacterium tuberculosis, against virulent Mycobacterium bovis, against Mycobacterium ulcerans and against two Mycobacterium avium subspecies. Among the 33 substances that were tested, compound 12, i.e. 4,4′-[1,12-dodecanediyl(oxy)]bisbenzaldehyde, emerged as the most promising hit. Its activity was further confirmed in an intracellular growth inhibition assay of M. tb in murine J774 A.1 macrophages. None of the compounds showed significant cytotoxicity on human C3A hepatocytes in a neutral red dye uptake assay and no genotoxicity or mutagenicity was observed as demonstrated by a VITOTOX test and confirmed with a comet assay.
- Cappoen, Davie,Forge, Delphine,Vercammen, Frank,Mathys, Vanessa,Kiass, Mehdi,Roupie, Virginie,Anthonissen, Roel,Verschaeve, Luc,Vanden Eynde, Jean Jacques,Huygen, Kris
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p. 731 - 738
(2013/07/25)
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- CONTROLLED RELEASE FORMULATIONS FOR THE DELIVERY OF HIF-1 INHIBITORS
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Controlled release dosage formulations for the delivery of one or more HIF-1 inhibitors are provided. The controlled release formulations contain one or more HIF-1 inhibitors conjugated to or dispersed in a polymeric vehicle. In some cases, one or more HI
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Page/Page column 73
(2013/09/26)
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- Synthesis and conformation properties of alkylene-aromatic poly(ether esters) with nonlinear hetaryl-containing mesogenic fragments in the backbone
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A thermotropic mesogenic alkylene-aromatic poly(ether ester) was prepared by phase-transfer polycondensation of the azomethine derived from 5-amino-2-phenylbenzoxazole and 3,4-dihydroxybenzaldehyde with 1,6-bis(4-chlorocarbonylphenoxy)hexane in the presen
- Bushin,Andreeva,Strelina,Rudaya,Chernienko,Ramsh,Shamanin
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experimental part
p. 832 - 839
(2011/09/20)
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- Synthesis, characterization and in vitro degradation of poly(ester-anhydride)s based on succinic acid and 1,6-bis-p-carboxyphenoxyhexane
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This paper describes synthesis and characteristics of functional poly(ester-anhydride)s bearing allyl pendant groups. The polymers were obtained by polycondensation of 1,6-bis-p-carboxyphenoxyhexane (CPH) and oligo(3-allyloxy-1,2-propylene succinate) term
- Jaszcz, Katarzyna,?ukaszczyk, Jan
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experimental part
p. 630 - 638
(2011/12/15)
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- Synthesis and liquid crystalline properties of new thermotropic polyurethanes
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The synthesis and liquid crystal behavior of new thermotropic polyurethanes derived from different mesogenic diols, alkylene di[4-(ω-hydroxyalkyloxy-4-oxybenzoyl)oxybenzoate]s, and 2,4-toluenediisocyanate are reported. Depending upon the chemical structur
- Chiellini,Galli,Trusendi,Angeloni,Laus,Francescangeli
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p. 135 - 147
(2007/10/02)
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- FROM CONVENTIONAL TO LIQUID CRYSTALLINE POLYESTERS
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To obtain liquid crystalline copolyesters with improved thermal behavior, p-acetoxybenzoyloxy-benzoic acid and a variety of dicarboxylic acids derived from p-hydroxybenzoic acid in combination with acetylated hydroquinone derivatives have been used as poly(ethylene terephthalate) (PETP) modifiers.The influence of the modifier structure on thermotropic properties of the copolyesters and results of dynamic mechanical measurements are discussed.
- Hempel, Erika,Lindau, Juergen,Roetz, Uwe,Fischer, Hartmut,Utschick, Hermann,Kuschel, Frank
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p. 199 - 204
(2007/10/02)
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- Synthesis and Thermotropic Properties of Twin Mesogens Containing a Polymethylene Spacer
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DSC and microscopic data are presented for a thermotropic twin mesogen series.Deviations from normal trends were observed.
- Aguilera, C.,Ahmad, S.,Bartulin, J.,Mueller, H. J.
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p. 277 - 282
(2007/10/02)
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