Montmorillonite–graphene oxide hybrids and montmorillonite–graphene oxide/epoxy composite: Synthesis, characterization, and properties

Li, Shengjuan; Yang, Zhihong; Xu, Jiwen; Xie, Jing

doi:10.1002/pc.24461

Cited by 17 publications

(8 citation statements)

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“…Their interaction with epoxy resin forms interphase layers. Undoubtedly, all these factors affect the properties of epoxy nanocomposites [1][2][3][4][5][6][7][8][9][10][11][15][16][17] .…”

mentioning

confidence: 99%

Reinforcing effects of aminosilane-functionalized h-BN on the physicochemical and mechanical behaviors of epoxy nanocomposites

Mostovoy

Vikulova

Lopukhova

2020

Sci Rep

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The results of this study confirm the possibility of the directional regulation of operational properties of epoxy composites by the use of small additives of hexagonal boron nitride (h-BN), providing the creation of epoxy composites with high performance properties. The effectiveness of h-BN surface modification by γ-aminopropyltriethoxysilane and the formation of strong chemical bonds at the polymer matrix/filler interface has been proved, which ensures an increase in physico-mechanical characteristics of epoxy composites: bending stress increases by 142% and bending modulus increases by 52%, strength increases by 53% and tensile elastic modulus increases by 37%, toughness increases by 400% and Brinell hardness increases by 96%, compared with an unfilled plasticized epoxy composite. Research in the field of polymer modification with functional additives is widely used to create polymer materials with a given set of consumer characteristics. So, to give polymer composite materials and products made from them enhanced functional characteristics, various modifying additives are used, for example, graphite, CNTs, TEG, graphene or metal oxides 1-14. The use of nanocomposites is determined by their unique properties, which are due to the huge specific surface and high surface energy of nanoparticles. Nanometer particles, unlike microand larger inclusions, are not stress concentrators, which contributes to a significant increase in the mechanical properties of nanocomposites 1-3,7. However, the addition of nanomaterials into epoxy compositions only slightly increases the strength of composites and in some cases even decreases it. This is due to small adhesion between nanomaterials and the polymer matrix and to the fact that it is often energetically more profitable for nanomaterials to agglomerate with each other. As a result, to improve adhesion interaction with the polymer matrix and to improve dispersion (reduce agglomeration) hardening nanomaterials are modified in various ways: by plasma treatment, by acid treatment, amines, etc. 6-9. A promising method of surface modification of nanomaterials is direct fluorination, i.e. the effect of fluorine gas mixtures at temperatures from room temperature to 400-500 °C. Fluorination also leads to improved solubility of nanomaterials in various solvents. The effect of CNTs modified by direct fluorination on the properties of epoxy composites was shown in 7. The addition of 0.1 mass % fluorinated CNTs improves physical and mechanical properties: 50% increase in strength and 74% increase in modulus of elasticity during tension, 60% increase in strength and 66% increase in modulus of elasticity during bending, and besides, abrasive wear decreases by 33%. In this research 6 , aminopropyltrimethoxysilane was incorporated as an interfacial modifier on the surface of graphene (Gr) nanoplatelets. The addition of functionalized Gr enhanced the tensile strength and strain to failure only at low contents (i.e., 0.05 wt%). Besides, this decreased the coefficient of friction and wear rat...

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“…Their interaction with epoxy resin forms interphase layers. Undoubtedly, all these factors affect the properties of epoxy nanocomposites [1][2][3][4][5][6][7][8][9][10][11][15][16][17] .…”

mentioning

confidence: 99%

Reinforcing effects of aminosilane-functionalized h-BN on the physicochemical and mechanical behaviors of epoxy nanocomposites

Mostovoy

Vikulova

Lopukhova

2020

Sci Rep

View full text Add to dashboard Cite

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“…In figure 6 c , FTIR pattern of MMT shows the bands at 362 cm −1 (–OH stretch of structural hydroxyl), 3456 cm −1 (–OH stretch of absorbed water), 1643 cm −1 (–OH bending of structural hydroxyl), 1450 cm −1 (–OH bending of absorbed water) and 1037 cm −1 (Si–O stretch of silicate tetrahedral). The pattern of GO shows the bands at 3445 cm −1 (–OH stretch), 1626 cm −1 (–OH bending), 1384 cm −1 (C=C bending), 1711 cm −1 (C=O stretch of carboxyl group), 1218 cm −1 (C–O stretch of carboxyl group) and 1045 cm −1 (C–O–C stretch of epoxy group) [28,40,41]. In the FTIR spectrum of GO–MMT aerogel, almost all the characteristic bands of GO and MMT appear and no new bands present, indicating that there may be no chemical interaction between them in the binary sample.…”

Section: Resultsmentioning

confidence: 99%

“…GO was prepared from the graphite powders using Hummer's method [27,28]. High-speed centrifugation together with dialysis was applied to remove the acidic or ionic impurities from the as prepared GO.…”

Section: Methodsmentioning

confidence: 99%

Clay–graphene oxide liquid crystals and their aerogels: synthesis, characterization and properties

Yang

et al. 2019

R. Soc. open sci.

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The dispersions containing two kinds of layered solids—graphene oxide (GO) and exfoliated montmorillonite (MMT) were mainly prepared, following which the binary aerogels were synthesized. The results indicate that the formation of liquid crystals (LCs) occurs at lower GO concentration and the birefringence becomes stronger when MMT is introduced into GO dispersion. Sol–gel transition forms in the binary suspensions with different mass fractions of MMT and GO. LCs with highly ordered alignment are observed in the gel and the fraction of LCs obviously increases with the increase in GO concentration. Moreover, the birefringence is observed in MMT–GO binary aerogels with the interconnected three-dimensional porous network, which is attributed to the ordered arrangement of MMT and GO nanosheets in pore walls. Among the aerogels with different MMT/GO ratios, the samples at the ratio of 10 : 1 show better adsorption capacity and removal percentage of cationic and anionic dyes.

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“…Research in the field of polymer modification with functional additives is widely used to develop polymer composites with a given set of consumer characteristics [1][2][3]. So to give polymer composites and products made from them improved functional characteristics, various nanomodifiers are used, for example, oxidized graphite, carbon nanotubes (CNTs) [4], fullerenes [5], graphene nanoplatelets [6,7], natural clay minerals [8,9] or metal oxides [10,11].…”

Section: Introductionmentioning

confidence: 99%

Epoxy Nanocomposites Reinforced with Functionalized Carbon Nanotubes

et al. 2020

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In this article, amino functionalized multiwalled carbon nanotubes (MWCNTs) were prepared by chemical modification of the surface of a MWCNTs using γ-aminopropyltriethoxysilane (APTES) and dispersed into the epoxy composition. The modifying agent (APTES) was directly deposited on the MWCNTs surfaces. For the functionalization of MWCNTs, was used not the APTES concentrate, as it had been described in previous works, but its freshly prepared aqueous solution. Properties of APTES-treated MWCNTs were characterized by transmission electron microscope (TEM), Raman spectroscopy and FT-IR. The results showed that the functionalization and chemical compatibility of APTES-treated MWCNTs with epoxy composition provides their best dispersion in the epoxy composition, had important influence on curing behavior, structure and physicochemical properties of the epoxy composites plasticized with trichloroethyl phosphate. The results showed that the functionalization and chemical compatibility of APTES-treated MWCNTs with epoxy composition provides increased of physicomechanical properties of epoxy composites: bending stress increases by 194% and bending modulus increases by 137%, the tensile strength increases by 108% and the tensile elastic modulus increases by 52%, impact strength increases by 300%, in comparison with plasticized epoxy composite that does not contain MWCNTs.

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Montmorillonite–graphene oxide hybrids and montmorillonite–graphene oxide/epoxy composite: Synthesis, characterization, and properties

Cited by 17 publications

References 50 publications

Reinforcing effects of aminosilane-functionalized h-BN on the physicochemical and mechanical behaviors of epoxy nanocomposites

Reinforcing effects of aminosilane-functionalized h-BN on the physicochemical and mechanical behaviors of epoxy nanocomposites

Clay–graphene oxide liquid crystals and their aerogels: synthesis, characterization and properties

Epoxy Nanocomposites Reinforced with Functionalized Carbon Nanotubes

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