New functional metallosiloxanes with partially siloxy substituted metall atom and their use in silicone compositions

Tarasenkov, А. N.; Tebeneva, N. A.; Parshina, Maria S.; Meshkov, I. B.; Василенко, Н. В.; Cherkaev, G. V.; Goncharuk, G. P.; Katsoulis, Dimitris E.; Muzafarov, А. М.

doi:10.1016/j.jorganchem.2019.121034

Cited by 13 publications

(6 citation statements)

References 18 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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“…In this work, we studied the process of epoxy resin curing with partially siloxy‐substituted metallo(alkoxy)siloxanes (further as «MS»). Previously, we demonstrated the catalytic activity of functional MS in condensation processes involved in PDMS rubber curing 37 . Since the main catalytic role in this process presumably belonged to the active metal center, we assumed that, since both a metal oxide center and ethoxy functions are present, these compositions can also manifest reactivity in epoxy ring opening.…”

Section: Resultsmentioning

confidence: 95%

“…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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“…The choice of this inorganic compound as a filler was not accidental: we need such an aerogel for further NMR studies (see Section and Supp.Inf.2). Moreover, such Cr-siloxane aerogels can be used as an example of promising heterogeneous M@SiO 2 -catalysts with a relatively high specific surface area. − …”

Section: Resultsmentioning

confidence: 99%

Silica-Based Aerogels with Tunable Properties: The Highly Efficient BF₃-Catalyzed Preparation and Look inside Their Structure

et al. 2021

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This work presents a solution to one of the most fundamentally and practically important challenges in the production of silica-based aerogels, time consumption and expensiveness of these processes, with the main focus on the sol−gel process. We suggested a highly efficient BF 3 -catalyzed method for the production of aerogels, which allows one to shorten the stage of the formation of a (wet) gel to 5 min, the stage of gel aging to 0, while the stage of gel workup is not required; the duration of these stages, according to the literature, ranges from days to weeks. The process is performed using commercially available, simple, and inexpensive reagents and under mild reaction conditions: BF 3 •Et 2 O as the catalyst, acetone as the solvent, room temperature, and at atmospheric pressure. This approach allows one to quickly obtain both classic opaque and transparent silica-based aerogels from Si(OMe) 4 or Si(OEt) 4 as well as transparent superhydrophobic ones from their mixtures with MeSi(OMe) 3 or Me 2 Si(OMe) 2 . In addition, we succeeded in obtaining a series of aerogels with various organic and inorganic additives, in particular, in this way, luminescent and metallasiloxane ones were prepared. Also, the effect of the method for producing silica-based aerogels on their (supra)molecular structure and morphology was thoroughly studied by a set of physicochemical methods of analysis: scanning electron and light microscopy, X-ray microtomography, and NMR experiments. These findings allow to tune the density, transparency, mechanical strength, hydrophobicity, and other properties depending on the need by choosing the right technique.

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New functional metallosiloxanes with partially siloxy substituted metall atom and their use in silicone compositions

Cited by 13 publications

References 18 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

Silica-Based Aerogels with Tunable Properties: The Highly Efficient BF₃-Catalyzed Preparation and Look inside Their Structure

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New functional metallosiloxanes with partially siloxy substituted metall atom and their use in silicone compositions

Cited by 13 publications

References 18 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

Silica-Based Aerogels with Tunable Properties: The Highly Efficient BF3-Catalyzed Preparation and Look inside Their Structure

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Product

Resources

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Silica-Based Aerogels with Tunable Properties: The Highly Efficient BF₃-Catalyzed Preparation and Look inside Their Structure