Polyfunctional branched metallosiloxane oligomers and composites based on them

Tebeneva, N. A.; Meshkov, I. B.; Tarasenkov, А. N.; Polshchikova, N. V.; Калинина, А. А.; Бузин, М. И.; Серенко, О. А.; Zubavichus, Ya. V.; Katsoulis, Dimitris E.; Музафаров, А. М.

doi:10.1016/j.jorganchem.2018.04.011

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…The introduction of new chemically reactive oligomers that have catalytic activity, among other features, significantly boosted the studies in this area. The development of efficient catalysis opened preparation prospects for reactive filling [ 18 , 19 ]. However, some restrictions on the thickness of specimens persisted, which were related to the diffusion of the water vapors needed for hydrolytic polycondensation and the released alcohol.…”

Section: Introductionmentioning

confidence: 99%

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

et al. 2021

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Colorless transparent vulcanizates of silicone elastomers were prepared by mixing the components in a common solvent followed by solvent removal. We studied the correlation between the mechanical behavior of polydimethylsiloxane (PDMS)-rubber compositions prepared using MQ (mono-(M) and tetra-(Q) functional siloxane) copolymers with different ratios of M and Q parts as a molecular filler. The composition and molecular structure of the original rubber, MQ copolymers, and carboxyl-containing PDMS oligomers were also investigated. The simplicity of the preparation of the compositions, high strength and elongation at break, and their variability within a wide range allows us to consider silicone elastomers as a promising alternative to silicone materials prepared by traditional methods.

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Section: Introductionmentioning

confidence: 99%

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

et al. 2021

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“…The following metallosiloxanes were used in this work: diethoxy(phenyldiethoxysiloxy)aluminum [OEt]2AlOSi(Ph)(OEt)2 (Al‐siloxane), diethoxy(phenyldiethoxysiloxy)iron [OEt]2FeOSi(Ph)(OEt)2 (Fe‐siloxane) , diethoxy‐bis‐(phenyldiethoxysiloxy)zirconium [OEt]2Zr[OSi(Ph)(OEt)2]2 (Zr‐siloxane). The synthesis of these compounds is reported elsewhere 36 …”

Section: Methodsmentioning

confidence: 99%

“…As they are initially in the form of oligomers, they can be uniformly distributed in the polymer bulk and undergo hydrolysis to give nanosized metal oxide clusters. Previously, they proved to be efficient crosslinking agents and precursors of nanofillers for silicone compositions 36,37 and as nanofillers for improving the properties of polyimide matrices 38,39 . The existence of an active metal center can favor efficient curing of an epoxy resin, and the possibility of varying the organic substituent at the silicon atom ensures the compatibility of the components of a material being cured at all process stages.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the curing processes of epoxy oligomers with partially substituted polyethoxymetallosiloxanes by IR spectroscopy and thermomechanical analysis

Parshina

Tarasenkov

Aysin

et al. 2021

J of Applied Polymer Sci

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In this work, the curing of «ED‐20» epoxy resin with partially siloxy‐substituted aluminum, iron, and zirconium siloxanes that we obtained previously was studied. The initial content of a metallosiloxane in the compositions was 5–50 wt% with respect to the resin. In all the cases, thermal curing was used to obtain a series of samples in the form of solid homogeneous materials. The fact of the epoxy ring opening in the resin was confirmed by IR spectroscopy. The catalytic properties of the metal atom in a metallosiloxane were found to affect the curing process. The samples demonstrate rather a high resistance to thermooxidative destruction, and in most cases, their glass transition temperatures are lower than those obtained upon standard curing of «ED‐20» resin with triethylenetetramine. Partially siloxy‐substituted metalloalkoxysiloxanes can be efficient agents for curing and formation of a hybrid material based on epoxy resins.

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“…Tris-(methyldiethoxysiloxy)aluminum (below Al-MDES), tris-(methyldiethoxysiloxy)iron (Fe-MDES), tris-(3-aminopropyldiethoxysiloxy)chromium (Cr-MDES), tetrakis-(methyldiethoxysiloxy)zirconium (Zr-MDES), tetrakis-(methyldiethoxysiloxy)hafnium (Hf-MDES) and pentakis-(methyldiethoxysiloxy)niobium (Nb-MDES) have been used as precursors of the dispersed phase of the composites. Precursors were synthesized according to known methods [ 40 ]. The structural formulas of the compounds are given in Figure S2 .…”

Section: Methodsmentioning

confidence: 99%

“…To experimentally examine this problem, branched functional metallosiloxane oligomers (BFMSOs) can be employed. BFMSOs have the general formula M[O-Si(R′)(OR″) 2 ] n , where R′ and R″ are hydrocarbon substituents [ 40 ]. BFMSOs can be used with organosoluble PI to obtain coatings or films filled in situ under the same conditions by employing the “one step” technique because imidization of the polyamide acid/filler mixture is not required, and a high humidity is not required when introducing the catalyst into the reaction volume during the in situ polymer filling [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Composition of the Hybrid Filler on the Atomic Oxygen Erosion Resistance of Polyimide Nanocomposites

et al. 2020

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The structure and properties of nanocomposites based on organosoluble polyimide (PI) and branched functional metallosiloxane oligomers with different types of central metal atoms (Al, Cr, Fe, Zr, Hf and Nb) were investigated. Under the same weight content of the filler, the geometric parameters of the nanoparticles and thermal properties of the nanocomposites did not exhibit a direct relationship with the ability of the materials to withstand the incident flow of oxygen plasma. The atomic oxygenerosion resistance of the filled PI films was influenced by the composition of the hybrid fillerand the type of metal atom in the hybrid filler in the base metallosiloxane oligomer. To determine the effectiveness of the nanoparticles as protective elements of the polymer surface, the nanocomposite erosion yields pertaining to the concentration of the crosslinked organo–inorganic polymer forming the dispersed phase were determined and expressed in mmol per gram PI. The filler concentration in the polymer, expressed in these units, allows for comparison of the efficiency of different nanosize fillers for use in fabricating space survivable coatings. This can be important in the pursuit of new precursors, fillers for fabricating space survivable polymer composites.

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Polyfunctional branched metallosiloxane oligomers and composites based on them

Cited by 21 publications

References 22 publications

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

Monitoring the curing processes of epoxy oligomers with partially substituted polyethoxymetallosiloxanes by IR spectroscopy and thermomechanical analysis

Influence of the Composition of the Hybrid Filler on the Atomic Oxygen Erosion Resistance of Polyimide Nanocomposites

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