Macromolecular nano-objects as a promising direction of polymer chemistry

Muzafarov, А. М.; Василенко, Н. В.; Татаринова, Е. А.; Ignat’eva, G. M.; Myakushev, V. M.; Obrezkova, M. A.; Meshkov, I. B.; Voronina, Natalia; Novozhilov, O. V.

doi:10.1134/s1811238211070022

Cited by 54 publications

(32 citation statements)

References 16 publications

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“…All dendrimers undergo devitrification in a fairly narrow temperature range. Numerous literature data indicate that the glass transition temperature of carbosilane dendrimers of the same homologous series depends on the outer layer density (molecular mobility of the structural units) [1,9,11,13,14,20,36,37]. Thus increasing its value by seven degrees on going from the first to the sixth generation is an expected result.…”

Section: Properties Of the Dendrimersmentioning

confidence: 78%

“…Finally, the product was purified by distillation under reduced pressure at p=0,21mbar and T=50 • C to yield 6,5 g (78 %) of a colorless liquid. 1 8 was obtained by hydrosilylation of the 1 st generation poly(allyl)carbosilane dendrimer. Dimethyl (2-phenylethyl)silane (3.6 g, 22.0 mmole) and platinum tetramethyldivinyldisiloxane (18μL) were added to a solution of the first-generation poly(allyl)carbosilane dendrimer (1.6 g, 2.3 mmole) in absolute toluene (12ml).…”

Section: Synthesismentioning

confidence: 99%

“…The product was isolated as a mixture of β -and α-isomers (87 %: 13 %) by distillation in vacuo at p=0.17 mbar and T=63 • C, yielding 53 g (92 %) of a colorless liquid which was used further. 1 Dimethyl(2-phenylethyl)silane was obtained by reduction of chloro(dimethyl)(2-phenylethyl)silane. Dimethyl (2-phenylethyl)silane (10 g, 0.050 mole) was added dropwise to a LiAlH 4 suspension (1.9 g, 0.050 mole) in dry THF.…”

Section: Synthesismentioning

confidence: 99%

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Synthesis of Carbosilane Dendrimers with 2-Phenylethyl End Groups and Influence of Generation Number on Glass Transition Temperature of PS-based Composites

Novozhilova

Серенко

Roldughin

et al. 2014

Silicon

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In this study we report the synthesis of carbosilane dendrimers of the 1 st , 3 rd and 6 th generations, containing 2 -phenylethyl external fragments in the outer layer. Also, we prepared composite materials from polystyrene and the obtained dendrimers. The composite glass transition temperature strongly depends on the generation number and the filler content. A previously developed theoretical model for the glass transition temperature change caused by nanosized filler of a core-shell type matches the experimental data.

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Section: Properties Of the Dendrimersmentioning

confidence: 78%

Section: Synthesismentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

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Synthesis of Carbosilane Dendrimers with 2-Phenylethyl End Groups and Influence of Generation Number on Glass Transition Temperature of PS-based Composites

Novozhilova

Серенко

Roldughin

et al. 2014

Silicon

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“…Consequently, they have greater concentration of monomers that leads to greater volume effects. Star-like molecules can be considered as unique objects, combining properties of linear polymers and colloid particles as was also pointed out in [1,2]. It was correctly mentioned in [3] that the star polymer with a small number of arms is close in its behavior and properties to that of a linear polymer, while with an increased number of arms, it becomes closer to a rigid spherical particle.…”

Section: Introductionmentioning

confidence: 94%

Entropic sampling of star-shaped polymers with different number of arms: temperature dependencies of structural properties

Silanteva¹,

Vorontsov-Vèlyaminov²

2015

Nanosist.: fiz. him. mat.

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The lattice model for a star-shaped polymer with a total number of up to 72 segments is considered. The number of arms varied, ranging from 2 to 6. Entropic sampling Monte Carlo simulation is used to obtain the equilibrium, thermal and structural properties of the considered systems over a wide range of temperatures. The coil-globule transition is observed and the transition temperature is shown to shift toward lower temperatures with an increase in the number of arms. This study demonstrates how the structure of the star-shaped polymer affects its equilibrium properties.

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“…It is known that they are qualitatively different from their linear analogs: the increase of branching leads to an increase in the average concentration of monomers within the macromolecule [20][21][22]. Therefore, the volume effects for branched polymers are more significant than in the case of linear chains.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium properties of 3-arm star-shaped polyions: an entropic sampling Monte Carlo study

Silanteva¹,

Yurchenko²,

Vorontsov-Vèlyaminov³

et al. 2017

Nanosystems: Phys. Chem. Math.

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The entropic sampling Monte Carlo method within Wang-Landau algorithm is applied to investigate properties of a lattice model of strongly charged flexible 3-arm star-shaped polyelectrolyte. The density of states is calculated, from which the canonical properties of the system in a wide temperature range are obtained by simple integration. The effects of the arm length and the short-range monomer-monomer potential on the thermal and structural properties of star polyions are studied. We calculate such characteristics as mean square radius of gyration and its components, the radius vector of the center of mass, components of the tensor of inertia and parameters characterizing the shape of the polyion. In this work, we focus on how these characteristics are influenced by the change of the reduced temperature which, within the considered model, is a parameter combining the effect of real temperature, linear charge density and solvent dielectric permittivity. The coil-globule transition is observed in most of the considered cases, and for the polyions with the longest length of arms (24), the transition from a liquid globule to a solid-like state is observed. Comparison of polyelectrolyte models with neutral ones is given.

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Macromolecular nano-objects as a promising direction of polymer chemistry

Cited by 54 publications

References 16 publications

Synthesis of Carbosilane Dendrimers with 2-Phenylethyl End Groups and Influence of Generation Number on Glass Transition Temperature of PS-based Composites

Synthesis of Carbosilane Dendrimers with 2-Phenylethyl End Groups and Influence of Generation Number on Glass Transition Temperature of PS-based Composites

Entropic sampling of star-shaped polymers with different number of arms: temperature dependencies of structural properties

Equilibrium properties of 3-arm star-shaped polyions: an entropic sampling Monte Carlo study

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