Synthesis and Properties of Sulfonated Copolymers of Oxadiazole, Dioxophenoxathiine, and Diphenyl Oxide

Yadikova, A. E.; Yashchenko, V. S.; Makarova, V. V.; Matveenko, Yu. V.; Kostyuk, Anna V.; Ilyin, Sergey O.

doi:10.1134/s156009042001011x

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…Cholesterics have found applications for creating memory cells capable of storing information for up to several years and as thermal indicators due to their high sensitivity to even the slightest changes in the ambient temperature [31]. Other applications of LCs are as charge-transfer matrices [32], lubricants [33][34][35][36], templating systems [37], superabsorbents [38,39], biosensors [40], electrical switches [41], pressure-sensitive adhesives [42], different shape-memory [43], stimuli-responsive [44], ion-conducting [45], and other functional materials [46], although the most common one is the creation of liquid-crystal displays for various devices [47,48].…”

Section: Introductionmentioning

confidence: 99%

Alkylbenzoic and Alkyloxybenzoic Acid Blending for Expanding the Liquid Crystalline State and Improving Its Rheology

Yadykova,

Konstantinov,

Vlasova

et al. 2023

IJMS

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Thermotropic mesogens typically exist as liquid crystals (LCs) in a narrow region of high temperatures, making lowering their melting point with the temperature expansion of the mesophase state an urgent task. Para-substituted benzoic acids can form LCs through noncovalent dimerization into homodimers via hydrogen bonds, whose strength and, consequently, the temperature region of the mesophase state can be potentially altered by creating asymmetric heterodimers from different acids. This work investigates equimolar blends of p-n-alkylbenzoic (kBA, where k is the number of carbon atoms in the alkyl radical) and p-n-alkyloxybenzoic (kOBA) acids by calorimetry and viscometry to establish their phase transitions and regions of mesophase existence. Non-symmetric dimerization of acids leads to the extension of the nematic state region towards low temperatures and the appearance of new monotropic and enantiotropic phase transitions in several cases. Moreover, the crystal–nematic and nematic–isotropic phase changes have a two-step character for some acid blends, suggesting the formation of symmetric and asymmetric associates from heterodimers. The mixing of 6BA and 8OBA most strongly extends the region of the nematic state towards low temperatures (from 95–114 °C and 108–147 °C for initial homodimers, respectively, to 57–133 °C for the resulting heterodimer), whereas the combination of 4OBA and 5OBA gives the most extended high-temperature nematic phase (up to 156 °C) and that of 6BA and 9OBA (or 12OBA) provides the existence of a smectic phase at the lowest temperatures (down to 51 °C).

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Section: Introductionmentioning

confidence: 99%

Alkylbenzoic and Alkyloxybenzoic Acid Blending for Expanding the Liquid Crystalline State and Improving Its Rheology

Yadykova,

Konstantinov,

Vlasova

et al. 2023

IJMS

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“…38 Copolymers of 1,3,4-oxadiazole can be synthesized by a one-pot method using polycondensation of aromatic dicarboxylic acid with hydrazine sulfate in fuming sulfuric acid. [39][40][41][42][43][44] This allows sulfo-containing monomers to be used for embedding them directly into the chain, bypassing the polymer sulfonation stage. The 1,3,4-oxadiazole copolymers containing DE fragments are characterized by a high glass transition temperature, strength and rigidity, 45 whereas copolymers with S,S-dioxodibenzothiophene fragments have high strength and good thermo-and fire-resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Copolymers of 1,3,4‐oxadiazole can be synthesized by a one‐pot method using polycondensation of aromatic dicarboxylic acid with hydrazine sulfate in fuming sulfuric acid 39–44 . This allows sulfo‐containing monomers to be used for embedding them directly into the chain, bypassing the polymer sulfonation stage.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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Sulfonated poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenyleneoxy-1,4-phenylene), poly(1,3,4-oxadiazole-2,5-diyl-10,10-dioxophenoxathiine-2,8-diyl) and their copolymers were one-pot synthesized in fuming sulfuric acid with the use of 4,4 0-oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non-fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi-dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470°C, respectively. The ionic conductivity of the films under direct current conditions was 0.001-0.01 ∼S cm-1 for sodium cations and 0.3-1 mS cm-1 for protons.

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Mesophase state and shear-affected phase separation of poly(p-phenylene-benzimidazole-terephthalamide) solutions in N,N-dimethylacetamide

Ilyin

Kotomin

2022

J Polym Res

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Synthesis and Properties of Sulfonated Copolymers of Oxadiazole, Dioxophenoxathiine, and Diphenyl Oxide

Cited by 3 publications

References 45 publications

Alkylbenzoic and Alkyloxybenzoic Acid Blending for Expanding the Liquid Crystalline State and Improving Its Rheology

Alkylbenzoic and Alkyloxybenzoic Acid Blending for Expanding the Liquid Crystalline State and Improving Its Rheology

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Mesophase state and shear-affected phase separation of poly(p-phenylene-benzimidazole-terephthalamide) solutions in N,N-dimethylacetamide

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