Hybrid organo‐inorganic globular nanospecies: Transition from macromolecule to particle

Voronina, Natalia; Meshkov, I. B.; Laptinskaya, T. V.; Папков, В. С.; Buzin, M. I.; Il’ina, M. N.; Ozerin, А. N.; Muzafarov, А. М.

doi:10.1002/pola.24219

Cited by 35 publications

(24 citation statements)

References 26 publications

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“…The hybrid nanoparticles commonly consist of the rigid inorganic core surrounded by the soft polymer shell [2, 3]. The typical examples for the inner part are SiO 2 , Fe 2 O 3 and some other transitional metal oxides or small metal clusters such as Au or Si particles.…”

Section: Introductionmentioning

confidence: 99%

“…Frequently, the interest of such materials is focused on the properties of the core material, such as optical or magnetic properties whereas shell provides good solubility or ability to be dispersed in polymer matrix preventing the aggregation of particles. The addition of inorganic nanosized fillers reveals promising strategy for fabrication of high performance polymer-based materials through the combination, in the same system, of the peculiar properties of organic and inorganic components [3, 4]. …”

Section: Introductionmentioning

confidence: 99%

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A Solid-State NMR Investigation of MQ Silicone Copolymers

et al. 2013

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The structure of MQ copolymers of the general chemical formula [(CH3)3SiO0.5]m [SiO2]n was characterized by means of solid-state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. The MQ copolymers are highly branched polycyclic compounds (densely cross-linked nanosized networks). MQ copolymers were prepared by hydrolytic polycondensation in active medium. 29Si NMR spectra were obtained by single pulse excitation (or direct polarization, DP) and cross-polarization (CP) 29Si{1H} techniques in concert with MAS. It was shown that material consist of monofunctional M (≡SiO Si (CH3)3) and two types of tetrafunctional Q units: Q4 ((≡SiO)4Si) and Q3 ((≡SiO)3SiOH). Spin–lattice relaxation times T1 measurements of 29Si nuclei and analysis of 29Si{1H} variable contact time signal intensities allowed us to obtain quantitative data on the relative content of different sites in copolymers. These investigations indicate that MQ copolymers represent dense structure with core and shell.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Solid-State NMR Investigation of MQ Silicone Copolymers

et al. 2013

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“…Viscosity values for almost all particles indicate that these hybrid systems behave in a similar way as model systems thoroughly investigated in work [31]. This means that their behavior can be described in terms of a ''molecule-particle'' model, though for a more specific attribution, especially for fractionated samples, detailed thermomechanical investigations are required.…”

Section: Discussionmentioning

confidence: 87%

“…3.1.3 was chosen as a basis for synthesis of silica core. On the one hand this option provides production of densest silica particles and on the other hand it is closest to the option of carrying out blocking processes in active media [31]. To avoid possible interesterification processes with acetic acid, polycondensation of TEOS was conducted in methoxyacetic acid at 40°C for 1 h followed by blocking reaction with bis-(methoxyacetoxymethyl)tetramethyldisiloxane at 80°C for 6 h. Yield of modified polymer was 87%, it was viscous liquid.…”

Section: Synthesis Of Molecular Silica Systems Modified With Acetoxy(mentioning

confidence: 99%

Synthesis and Characterization of Hybrid Core–Shell Systems Based on Molecular Silicasols

Kazakova

Zhiltsov

Gorbatsevitch

et al. 2011

J Inorg Organomet Polym

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New hybrid ''rigid inorganic core-soft organic shell'' systems based on molecular silicasols were synthesized by applying different synthetic schemes. Inorganic core was composed of molecular silicasols, which were synthesized from hyperbranched polyethoxysiloxane and tetraethoxysilane by polymer chemistry methods. Different organic modifiers were used to form soft shell of the hybrid particles. Obtained compounds were characterized by elemental analysis, GPC, IR and NMR spectroscopy. These systems will be designated for use as model objects for investigation of nanoparticles-polymer matrix interactions in polymer nanocomposites.

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“…Such systems might be considered as a peculiar molecular composite consisting of separate parts that play the role of a polymer matrix, a plasticizer, and a nanosized filler [69]. It is clear that the ratio of these parts depends on the reaction conditions and ultimately determines properties of the material.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

2017

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In this review, we discuss currently available studies on the synthesis and properties of MQ copolymers. The data on methods of producing hydrolytic and heterofunctional polycondensation of functional organosilanes as well as the obtaining MQ copolymers based on silicic acids and nature silicates are considered. The ratio of M and Q monomers and the production method determine the structure of MQ copolymers and, accordingly, their physicochemical characteristics. It is shown that the most successful synthetic approach is a polycondensation of organoalkoxysilanes in the medium of anhydrous acetic acid, which reduces the differences in reactivity of M and Q monomers and leads to obtaining a product with uniform composition in all fractions, with full absence of residual alkoxy-groups. The current concept of MQ copolymers is that of organo-inorganic hybrid systems with nanosized crosslinked inorganic regions limited by triorganosilyl groups and containing residual hydroxyl groups. The systems can be considered as a peculiar molecular composites consisting of separate parts that play the role of a polymer matrix, a plasticizer, and a nanosized filler.

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Hybrid organo‐inorganic globular nanospecies: Transition from macromolecule to particle

Cited by 35 publications

References 26 publications

A Solid-State NMR Investigation of MQ Silicone Copolymers

A Solid-State NMR Investigation of MQ Silicone Copolymers

Synthesis and Characterization of Hybrid Core–Shell Systems Based on Molecular Silicasols

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

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