Alkoxysilyl derivatives of polyhedral oligosilsesquioxanes containing amino and hydroxyl groups and sol-gel hybrid materials on their basis

Tereshchenko, T.A.; Shevchuk, A. D.; Shevchenko, V. V.; Snegir, Sergii; Pokrovskii, V. A.

doi:10.1134/s0965545x06120042

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…POSS-M, denoted as POSS in the manuscript, refers to mixed silsesquioxane cores (polyhedra, incompletely condensed polyhedra, ladder-type structures, linear structures, and all the possible combinations), in contrast to the geometrically specific POSS compounds (Figure ). The POSS cores were synthesized by hydrolytic condensation of the precursor on a base of 3-aminopropyl triethoxysilane with a 2-fold molar excess of glycidol according to a well-established procedure . Glutaraldehyde (70% in H 2 O, Aldrich) was diluted to 2% solution with water.…”

Section: Methodsmentioning

confidence: 99%

Co-cross-linking Silk Matrices with Silica Nanostructures for Robust Ultrathin Nanocomposites

et al. 2010

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We report on a novel assembly approach to fabricate ultrathin robust freely standing nanocomposite membranes. The materials are composed of a pre-cross-linked silk fibroin matrix with incorporated silica nanoparticles with silsesquioxane cores (POSS) or clay nanoplatelets. These reinforced silk membranes have enhanced mechanical properties as compared to traditional silk-based nanocomposites reported previously. Up to 6-fold and 8-fold increase in elastic modulus and toughness, respectively, were found for these nanocomposites. In contrast, traditional LbL-assembled nanocomposites showed only a 3-fold increase in mechanical strength. The silk nanocomposites obtained also revealed excellent optical transparency in the visible region especially if reinforced with POSS nanoparticles, which suggests their utility as low cost, nontoxic, and easily scalable reinforced biomaterials for mechanically demanding applications.

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Section: Methodsmentioning

confidence: 99%

Co-cross-linking Silk Matrices with Silica Nanostructures for Robust Ultrathin Nanocomposites

et al. 2010

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“…Зокрема, було запропоновано неорганічну складову не у вигляді індивідуальних октаедральних POSS, а у формі їх суміші зі сполуками завершеної та незавершеної поліедральної (клітинної) структури та відкритоланцюговими аналогами, отриманої за допомогою золь-гель процесу [18][19][20][21][22][23][24]. Змінюючи будову органічного обрамлення і умови проведення золь-гель процесу можна регулювати співвідношення клітинних і відкритоланцюгових структур [18][19][20][21][22][23][24][25][26], для яких ми вводимо позначення OSS.…”

Section: синтез структура та властивості олігомерних іонних рідин високорозгалуженої будови та особливості їх самоорганізаціїunclassified

“…У літературі описано реакційноздатні OSS, які містять в органічному обрамленні епоксидну [20,21] або метакрилатну [21] групи, а також фрагменти, що поєднують аліфатичні третинні амінні групи з гідроксильними OSS(N+OH) [18,19,25,26]. Ці сполуки перспективні для використання як самі по собі, так і для отримання на їх основі наноструктурованих полімерних матеріалів різного призначення [18,19].…”

“…Вибрана як вихідний реагент сполука OSS(N + OH) являє собою набір силсесквіоксанових наночастинок розміром близько 3 нм [18,19,25,26], неорганічна складова яких є поєднанням клітчастих та відкритоланцюгових структур, а органічна складова містить аліфатичні гідроксильні та третинні аміногрупи у співвідношенні N:OH = 1:4 (рис. 1).…”

Section: результати та їх обговоренняunclassified

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Synthesis, structure and properties of oligomeric ionic liquids of highly branched structure and special features of their self-arrangement

Шевченко¹,

Stryutsky²,

Gumenna³

et al. 2021

New Functional Substances and Materials for Chemical Engineering

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Synthesis, features of structural organization and behavior in aqueous solution of amphiphilic reactive aprotic cationic oligomeric ionic liquids obtained on the basis of a mixture of oligomeric amino- and hydroxyl-containing silsesquioxanes were considered. The dependence of the glass transition temperature, the value of ionic conductivity, self-organization in dilute aqueous solutions and the ζ-potential on the length of the alkyl substituent near the quaternary nitrogen atom in the composition of the synthesized compounds was shown. It was found that quaternization of the tertiary nitrogen atom of the starting oligomer causes a sharp decrease in the glass transition temperature. The value of the latter increases with an increase in the length of the hydrophobic alkyl fragments due to their association. In this case the ionic conductivity under anhydrous conditions decreases and at temperatures above 100°C drops by almost an order of magnitude. The maximum conductivity was reached for the oligomeric ionic liquid with the short alkyl chain and its value was 10-3 S/cm at 120oC. In dilute aqueous solutions the synthesized oligomeric ionic liquids with the short alkyl chain form aggregates with an average size of 100 nm while increasing the length of the alkyl chain prevents aggregation of silsesquioxane nuclei and leads to formation of unimolecular micelles with an average size of 3 nm

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“…Interfacial forces tend to drive the reagents to the nanosilica surfaces where opportunistic coupling with a surface hydroxyl will lead to the attachment of either of the surface modifying reagents. Subsequent condensation with other trimethoxysilanes is expected to lead to polyhedral oligosilesquioxanes, 26,27,31 and to dimers, ladder-like tetrameric rings and higher order ring structures. 30 Very recently 32 it has been shown that the autocondensation of the quaternary chloride trimethoxysilane utilized here followed by the same ion exchange process described above produces core-free nanofluids of considerably lower viscosity and storage modulus of only 0.15 Pa with a density of about 1.1 g cm À3 .…”

Section: Characterization Of Acrylate Nanofluidmentioning

confidence: 99%

Nanofluid acrylate composite resins—initial preparation and characterization

et al. 2011

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Alkoxysilyl derivatives of polyhedral oligosilsesquioxanes containing amino and hydroxyl groups and sol-gel hybrid materials on their basis

Cited by 12 publications

References 20 publications

Co-cross-linking Silk Matrices with Silica Nanostructures for Robust Ultrathin Nanocomposites

Co-cross-linking Silk Matrices with Silica Nanostructures for Robust Ultrathin Nanocomposites

Synthesis, structure and properties of oligomeric ionic liquids of highly branched structure and special features of their self-arrangement

Nanofluid acrylate composite resins—initial preparation and characterization

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