New approaches to the development of hybrid nanocomposites: from structural materials to high-tech applications

Gerasin, V. A.; Антипов, Е. М.; Karbushev, Valeriy V.; Куличихин, В. Г.; Карпачева, Г. П.; Talroze, R. V.; Kudryavtsev, Yaroslav V.

doi:10.1070/rc2013v082n04abeh004322

Cited by 106 publications

(43 citation statements)

References 366 publications

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“…It consists of self-organized stacks (tactoids) having isomorphically substituted metal cations defining the charge of layer unit. The tactoids are divided with certain interlaminar areas (galleries) [2-5,11]. Generally, polymer/MMT nanocomposites can be structured either as conventional composites (when thick clay stacks and their agglomerates are distributed in polymer matrix) or intercalated (polymer penetrates into interlaminar clay galleries), or, at the limit, totally exfoliated ones (distribution of delaminated clay nanolayers of about 1 nm in thickness inside polymer matrix).…”

Section: Introductionmentioning

confidence: 99%

“…Since the surfaces of virgin layered silicates are hydrophilic, significant hindrances appear at synthesis of high-performance polymer/clay nanocomposites comprising hydrophobic polymer matrices. To facilitate wetting and penetration of either non-polar or weak-polar chemicals into MMT interplanar area, clay modification with quaternary ammonium salts and silanes is used [11,15-18]. After modification, the resulted organoclay acquires organophilic properties and waterproof surface with strongly extended interlayer spacing.…”

Section: Introductionmentioning

confidence: 99%

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The impact of ultra-low amounts of amino-modified MMT on dynamics and properties of densely cross-linked cyanate ester resins

Bershteĭn¹,

Fainleib

Egorova³

et al. 2015

Nanoscale Res Lett

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Thermostable nanocomposites based on densely cross-linked cyanate ester resins (CER), derived from bisphenol E and doped by 0.01 to 5 wt. % amino-functionalized 2D montmorillonite (MMT) nanoparticles, were synthesized and characterized using Fourier transform infrared (FTIR), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDXS), wide-angle X-ray diffraction (WAXD), dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), far-infrared (Far-IR), and creep rate spectroscopy (CRS) techniques. It was revealed that ultra-low additives, e.g., 0.025 to 0.1 wt. %, of amino-MMT nanolayers covalently embedded into СER network exerted an anomalously large impact on its dynamics and properties resulting, in particular, in some suppression of dynamics, increasing the onset of glass transition temperature by 30° to 40° and twofold rise of modulus in temperature range from 20°C to 200°C. Contrarily, the effects became negligibly small or even negative at increased amino-MMT contents, especially at 2 and 5 wt. %. That could be explained by TEM/EDXS data displaying predominance of individual amino-MMT nanolayers and their thin (2 to 3 nanolayers) stacks over more thick tactoids (5 to 10 nanolayers) and the large amino-MMT aggregates (100 to 500 nm in thickness) reversing the composite structure produced with increasing of amino-MMT content within CER matrix. The revealed effect of ultra-low amino-MMT content testifies in favor of the idea about the extraordinarily enhanced long-range action of the ‘constrained dynamics’ effect in the case of densely cross-linked polymer networks.PACS82.35.Np Nanoparticles in polymers; 81.05.Qk Reinforced polymers and polymer-based composites; 81.07.Pr Organic-inorganic hybrid nanostructures

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The impact of ultra-low amounts of amino-modified MMT on dynamics and properties of densely cross-linked cyanate ester resins

Bershteĭn¹,

Fainleib

Egorova³

et al. 2015

Nanoscale Res Lett

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“…11 Depending on their chemical nature, nanoparticles can in `fact considerably improve mechanical, barrier, electric, optical, and other characteristics of matrix polymers while preserving their good processability. 12,13 However, the design of such composite systems usually requires a sophisticated strategy that encompasses nanoparticle synthesis, surface modification, directed introduction into the polymer bulk, and stabilization there. In the block copolymer case the problem is only complicated by the selectivity of nanoparticles towards different blocks and local perturbations that they introduce into the copolymer microstructure.…”

Section: Introductionmentioning

confidence: 99%

Ordering of anisotropic nanoparticles in diblock copolymer lamellae: Simulations with dissipative particle dynamics and a molecular theory

Berezkin

Kudryavtsev

Gorkunov

et al. 2017

The Journal of Chemical Physics

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Short title: Ordering of anisotropic nanoparticles: Simulations and theory a) Corresponding author. Electronic mail: yar@ips.ac.ru 2 ABSTRACT Local distribution and orientation of anisotropic nanoparticles in microphase-separated symmetric diblock copolymers has been simulated using dissipative particle dynamics and analyzed with a molecular theory. It has been demonstrated that nanoparticles are characterized by a non-trivial orientational ordering in the lamellar phase due to their anisotropic interactions with isotropic monomer units. In the simulations, the maximum concentration and degree of ordering are attained for nonselective nanorods near the domain boundary. In this case the nanorods have a certain tendency to align parallel to the interface in the boundary region and perpendicular to it inside the domains. Similar orientation ordering of spherical nanoparticles located at the lamellar interface is predicted by the molecular theory which takes into account that the nanoparticles interact with monomer units via both isotropic and anisotropic potentials. Computer simulations enable one to study the effects of the nanorod concentration, length, stiffness, and selectivity of their interactions with the copolymer components on the phase stability and orientational order of nanoparticles. If the volume fraction of the nanorods is lower than 0.1, they have no effect on the copolymer transition from the disordered state into a lamellar microstructure. Increasing nanorod concentration or nanorod length results in clustering of the nanorods and eventually leads to a macrophase separation, whereas the copolymer preserves its lamellar morphology. Segregated nanorods of length close to the width of the diblock copolymer domains are stacked side by side into smectic layers that fill domain space. Thus, spontaneous organization and orientation of nanorods leads to a spatial modulation of anisotropic composite properties creating an opportunity to align block copolymers by external fields which may be important for various applications.

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“…К та-ким средам относятся, например, жидкие кристаллы [2,3] и блок-сополимеры [4]. Локализация квантовых точек (КТ) в ряде систем контролируется взаимодей-ствием, обусловленным образованием ионных связей, между поверхностями квантовых точек и функцио-нальными группами анизотропных молекул [5].…”

Section: Introductionunclassified

Anisotropic Derivatives of (–)-L-lactic Acid and Nanocomposites on their Basis

Безбородов¹,

Shandryuk²,

Mikhalyonok³

et al. 2016

Liq. Cryst. and their Appl.

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New approaches to the development of hybrid nanocomposites: from structural materials to high-tech applications

Cited by 106 publications

References 366 publications

The impact of ultra-low amounts of amino-modified MMT on dynamics and properties of densely cross-linked cyanate ester resins

The impact of ultra-low amounts of amino-modified MMT on dynamics and properties of densely cross-linked cyanate ester resins

Ordering of anisotropic nanoparticles in diblock copolymer lamellae: Simulations with dissipative particle dynamics and a molecular theory

Anisotropic Derivatives of (–)-L-lactic Acid and Nanocomposites on their Basis

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