Evaluation of Polyethylene/Organoclay Nanocomposites by Low-field Nuclear Relaxation

Rodrigues, Tathiane Cordeiro; Tavares, Maria Inês Bruno; Preto, Mônica; Soares, Igor Lopes; Moreira, Ana C. F.

doi:10.1080/00914030802428716

Cited by 16 publications

(12 citation statements)

References 11 publications

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“…Uma forma de agregar valor a estas commodities é a formação de nanocompósitos, de forma a melhorar suas propriedades. Um grande número de trabalhos enfoca o uso de polietileno (PE) na produção de nanocompósitos e a relação de suas propriedades com o tipo e conteúdo de argila empregados [22][23][24][25][26][27][28][29] . O grupo de pesquisa em nanocompósitos da UFCG estudou o preparo de nanocompósitos de PE/argila brasileira bentonita organomodificada com diferentes sais quaternários de amônio por intercalação por fusão.…”

Section: Nanocompósitos De Polímeros De Uso Geralunclassified

Panorama da Pesquisa Acadêmica Brasileira em Nanocompósitos Polímero/Argila e Tendências para o Futuro

2011

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Resumo: A pesquisa em nanocompósitos polímero/argila foi iniciada pela Toyota no final dos anos 80. A partir deste marco, a comunidade científica mundial voltou sua atenção para este tipo de material graças às propriedades mecânicas, químicas e térmicas avançadas em comparação com os compósitos tradicionais. Não foi diferente no Brasil, tal atenção pode ser comprovada pelos inúmeros trabalhos científicos sobre nanocompósitos que começaram a despontar no início do século XXI. Assim, o presente artigo objetiva, após discorrer sobre as definições que concernem nanocompósitos polímero/argila, apresentar as pesquisas científicas brasileiras em nanocompósitos de polímeros de uso geral, de polímeros de engenharia e de outros tipos de polímeros, relacionando-os com o método de produção empregado, morfologia final e propriedades decorrentes da formação de nanocompósitos. Por fim, o mapa da pesquisa brasileira em nanocompósitos polímero/argila e sua perspectiva para o futuro são apresentados. Palavras-chave: Nanocompósito, polímero, argila. Scenario of the Brazilian Academic Research into Nanocomposites Polymer/Clay and Trends for the FutureAbstract: The research on polymer/clay nanocomposites was initiated by Toyota in the late 80s. From then on, the world scientific community has turned its attention to this type of material due to the enhanced mechanical, chemical and thermal properties in comparison to traditional composites. In Brazil, it was not different, as can be seen from the countless scientific works on nanocomposites which have emerged in the early 21 th century. The aim thus is, after discussing the definitions related to the polymer/ clay nanocomposites, to show Brazilian scientific works on the general use of plastics, engineering plastics and other types of polymers, correlating them with their production method, final morphology and resulting properties. Finally, a map of the Brazilian research into polymer/clay nanocomposites and their future perspective are presented. Keywords: Nanocomposite, polymer, clay. IntroduçãoNanocompósitos polímero/argila são uma nova classe de compósitos com matrizes poliméricas onde a fase dispersa é o silicato, constituída por partículas elementares que têm pelo menos uma de suas dimensões da ordem de nanômetros. As partículas minerais mais utilizadas nestes nanocompósitos são as argilas esmectíticas (montmorilonita, saponita e hectorita), tendo as suas partículas morfologia lamelar, com lados da ordem de um micrômetro e espessura de aproximadamente um nanômetro [1] . A camada unitária da montmorilonita (MMT) consiste em três folhas: uma folha octaédrica de hidrargilita-brucita incluídas entre duas folhas tetraédricas de silício e oxigênio (Figura 1). A água e outras moléculas, tais como moléculas orgânicas, podem entrar nas camadas unitárias causando a sua expansão. A distância entre camadas da montmorilonita varia de 9,6 Å, quando nenhuma molécula está entre as camadas unitárias, até quase a separação completa em alguns casos [2] . O interesse na produção de nanocompósito...

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Section: Nanocompósitos De Polímeros De Uso Geralunclassified

Panorama da Pesquisa Acadêmica Brasileira em Nanocompósitos Polímero/Argila e Tendências para o Futuro

2011

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“…The spin-lattice relaxation parameters involve changes in thermal equilibrium of spin systems and the responses of them are intrinsically related to the system's molecular dynamic that is derived from the morphology of the systems [6]. Because of this broad coverage, the relaxation parameters are of great value to understand the dispersion of the nanoparticles in the polymer matrix, the interaction between nanocomposite components, the molecular dynamic of the hybrid compound, and the molecular domains formation in an organic material [7]. Therefore, these techniques are increasingly used to analyze the molecular dynamics of polymer systems, particularly polymeric nanocomposites [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Organo-Clay Ratio in the HIPS-OMMT Nanocomposites Analyzed by Proton Spin-Lattice and Spin-Spin Relaxation Times

Silva¹,

Menezes²,

Tavares³

2016

MSA

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Spin-lattice and spin-spin relaxation times are one of the most attractive tools in the solid-state nuclear magnetic resonance spectroscopy to evaluate the level of clay dispersion in the nanocomposite matrices. The efficiency of the relaxation processes can be used to evaluate the nanoparticles intermolecular interactions and, consequently, the dispersion of them in the polymer matrix, the molecular dynamic of the hybrid compounds, as well as the molecular domains formation in an organic material. The determination of relaxation parameters was carried out to evaluate the organoclay exfoliation and intercalation process in the polymeric matrix, in addition to their dispersion and distribution in the matrix. The proton NMR relaxation data showed that the polymeric nanomaterials investigated presented good intermolecular interaction that promoted good nanoparticles dispersion and distribution in the hybrid materials. The proportion of 2% clay promoted a greater heterogeneity in the matrix compared to other ratios; 1% clay influenced only to the higher molecular rigidity phase; and 3% clay had a decrease in heterogeneity compared to 2% though still influenced the matrix as a whole. These results prove the efficiency of NMR technique in the evaluation of nanofillers interaction with polymer matrices, as well as their dispersion and distribution.

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“…The use of hybrid materials has aroused intensive academic and industrial interests over the past decade. A hybrid precursor composed of organic and inorganic parts leads to composites with dual actions on the ultimate properties . This multidisciplinary nature makes hybrid composites potential candidates for many industries, such as plastics, rubbers, fibers, coatings, and inks .…”

Section: Introductionmentioning

confidence: 99%

Structure-property relationship in epoxy-silica hybrid nanocomposites: The role of organic solvent in achieving silica domains

Bakhshandeh

Sobhani

Jannesari

et al. 2014

J Vinyl Addit Technol

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The thermo‐mechanical properties of a series of epoxy‐silica hybrid composites prepared through sol–gel process are evaluated in a manner that the effect of organic solvent on the formation of silica domains is highlighted. By means of infrared spectroscopy, small‐angle X‐ray scattering, scanning electron microscope, dynamic mechanical thermal analysis, and thermo‐gravimetric analyzer, the specimens were morphologically studied varying the type of organic solvent. Among polar and nonpolar solvents incorporated by the organic–inorganic hybrid system, a mixture of xylene and ethanol (3:1) was properly comparable with tetrahydrofuran (THF) solvent regarding appearance and thermo‐mechanical characteristics. Enhanced thermal stability and modulus was observed upon increasing solvent content. Also, a proper dispersion of silica domains throughout the epoxy was seen in the case that the xylene/ethanol mixture or THF served as solvent. It is to be emphasized that the assigned mixture is environmentally better than that of THF. J. VINYL ADDIT. TECHNOL., 21:305–313, 2015. © 2014 Society of Plastics Engineers

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Evaluation of Polyethylene/Organoclay Nanocomposites by Low-field Nuclear Relaxation

Cited by 16 publications

References 11 publications

Panorama da Pesquisa Acadêmica Brasileira em Nanocompósitos Polímero/Argila e Tendências para o Futuro

Panorama da Pesquisa Acadêmica Brasileira em Nanocompósitos Polímero/Argila e Tendências para o Futuro

The Influence of Organo-Clay Ratio in the HIPS-OMMT Nanocomposites Analyzed by Proton Spin-Lattice and Spin-Spin Relaxation Times

Structure-property relationship in epoxy-silica hybrid nanocomposites: The role of organic solvent in achieving silica domains

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