Epoxy clay nanocomposites – processing, properties and applications: A review

Azeez, Asif Abdul; Rhee, Kyong Yop; Park, Soo‐Jin; Hui, David

doi:10.1016/j.compositesb.2012.04.012

Cited by 611 publications

(353 citation statements)

References 115 publications

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“…Superposition of the X-ray diffractograms of OMMT and epoxy-based powder coatings with different OMMT contents. the clay in the polymer matrix, thus providing evidence of the presence of nanocomposites of predominantly exfoliated phase 1,4,9,10,[18][19][20][21] . The high intercalation of the epoxy resin towards the interior of the OMMT galleries of the cured samples is more relevant for the EPC/2-30B sample, with a shift of the "d 001 " basal plane towards values higher than 5.25 nm (Table 1), which results in a nanocomposite with an exfoliated structure.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Addition of Montmorillonite in an Epoxy Powder Coating Applied on Carbon Steel

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Influence of the Addition of Montmorillonite in an Epoxy Powder Coating Applied on Carbon Steel

et al. 2015

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“…After the groundbreaking experiments on the two-dimensional material graphene by Nobel Laureates, Sir Andre Geim and Konstantin Novoselov [16] from the University of Manchester, graphene came into limelight in research field mainly because of its excellent electrical [18], thermal [19], and mechanical properties [20]. Graphene found widespread applications in electronics [21], bio-electric sensors [22], energy technology [23], lithium batteries [24], aerospace [25], bio-engineering [26], and various other fields of nanotechnology [27]. In 2014, 2009 research papers were published on graphene in which about 830 papers were on graphene-epoxy nanocomposites produced using solution casting technique.…”

Section: Year Of Publicationsmentioning

confidence: 99%

Modeling and Simulation of Graphene Based Polymer Nanocomposites: Advances in the Last Decade

Atif¹,

Inam²

2016

Graphene

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Modeling and simulation allow methodical variation of material properties beyond the capacity of experimental methods. The polymers are one of the most commonly used matrices of choice for composites and have found applications in numerous fields. The stiff and fragile structure of monolithic polymers leads to the innate cracks to cause fracture and therefore the engineering applications of monolithic polymers, requiring robust damage tolerance and high fracture toughness, are not ubiquitous. In addition, when "many-parts" cling together to form polymers, a labyrinth of molecules results, which does not offer to electrons and phonons a smooth and continuous passageway. Therefore, the monolithic polymers are bad conductors of heat and electricity. However, it is well established that when polymers are embedded with suitable entities especially nano-fillers, such as metallic oxides, clays, carbon nanotubes, and other carbonaceous materials, their performance is propitiously improved. Among various additives, graphene has recently been employed as nano-filler to enhance mechanical, thermal, electrical, and functional properties of polymers. In this review, advances in the modeling and simulation of grapheme based polymer nanocomposites will be discussed in terms of graphene structure, topographical features, interfacial interactions, dispersion state, aspect ratio, weight fraction, and trade-off between variables and overall performance.

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“…A substituição de cátions de sódio por cátions orgânicos, em geral, causa um aumento da distância basal da argila, o que pode ser observado pela técnica de difração de raios-X (XRD) e, usualmente, quanto maior a cadeia orgânica do sal maior será a distância interlamelar alcançada. 11 Sais quaternários de amônio são os mais comumente utilizados para esse tipo de modificação, já que podem facilmente substituir os cátions mono ou divalentes presentes na argila bentonita. [12][13][14][15][16][17] Porém, os cátions quaternários de amônio não conseguem suportar temperaturas de processamento muito elevadas, 18-21 sendo assim, argilas organofílizadas por meio de um sal de amônio são menos adequadas para utilização em materiais que utilizam altas temperaturas de processamento, como em polímeros contendo argilas como reforço, que são submetidos a processos de extrusão.…”

Section: Introductionunclassified

Organofilização E Silanização De Argila Bentonita

Baruel¹,

Dutra²,

Baldan³

et al. 2017

Quim. Nova

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One of the most usual applications is their incorporation into organic materials. Nonetheless, natural clays are hydrophobic being incompatible with organic medium. Clay organophilization can be reached by several methods such as by exchange of the interlayer sodium cations by organic cations, and by silanization of the clay layers. In this study the bentonite clay was organophilized by the addition of the methoxymethyltriphenylphosphonium chloride (CTFF). Further, the organoclay was silanized with (3-glycidyloxypropyl) trimethoxysilane (GPTMS). X-ray fluorescence results, infrared and XPS spectroscopy showed the presence of phosphorus in the organophilic clay. The interlayer space, obtained by X-ray diffraction, increased in 55% after the CTFF addition showing the cationic exchange in the clay lamellar region. After the silanization of the organoclay the interlayer space was slightly reduced from 1,78 nm to 1,72 nm, indicating that the silane molecules were preferential bound in the clay edges.Keywords: organoclay; bentonite; silane; quaternary phosponium salt. INTRODUÇÃOA argila é definida como um material terroso, de granulação fina, apresenta alta plasticidade em água 1-3 e é formada pelo empacotamento de lamelas cristalinas.1,3-5 A bentonita uma das argilas de maior interesse tecnológico, 3,6,7 apresenta em sua configuração cátions interlamelares, que podem ser trocados por cátions orgânicos ou inorgânicos quando presentes em solução aquosa, influenciando suas propriedades físico-químicas e alterando seu espaçamento basal, essa propriedade é chamada de capacidade de troca catiônica (CTC). [2][3][4]8,9 O termo bentonita é comumente usado para designar argilas constituídas principalmente por argilomineral ou argilominerais esmectíticos, sendo o argilomineral mais frequentemente encontrado a montmorilonita. Essa classe de argilas é constituída principalmente por silicatos de alumínio e magnésio do tipo 2:1, no qual uma folha octaédrica está entre duas folhas tetraédricas. Esse silicato possui deficiência de cargas positivas em sua estrutura cristalina, resultando em excesso de cargas negativas, que é contrabalanceado por cátions interlamelares alcalinos, Na+ ou K+. A montmorilonita é caracterizada pela sua capacidade de troca catiô-nica, que permite que os cátions inorgânicos sejam substituídos por cátions orgânicos, aumentando seu caráter apolar, e possibilitando sua incorporação em meios orgânicos.3 Após a troca catiônica as argilas são denominadas argilas organofílicas ou organofilizadas, e a partir dessas é possível se obter complexos argila-compostos orgânicos.2,10 As argilas organofilizadas são mais facilmente incorporadas em sistemas orgânicos, como em cosméticos, tintas à base de solventes orgânicos, polímeros apolares e lubrificantes. A substituição de cátions de sódio por cátions orgânicos, em geral, causa um aumento da distância basal da argila, o que pode ser observado pela técnica de difração de raios-X (XRD) e, usualmente, quanto maior a cadeia orgânica do sal maior será a distância interlamelar ...

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Epoxy clay nanocomposites – processing, properties and applications: A review

Cited by 611 publications

References 115 publications

Influence of the Addition of Montmorillonite in an Epoxy Powder Coating Applied on Carbon Steel

Influence of the Addition of Montmorillonite in an Epoxy Powder Coating Applied on Carbon Steel

Modeling and Simulation of Graphene Based Polymer Nanocomposites: Advances in the Last Decade

Organofilização E Silanização De Argila Bentonita

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