Relationships between nanostructure and thermomechanical properties in poly(vinyl alcohol)/montmorillonite nanocomposite with an entrapped polyelectrolyte

Paranhos, Caio Márcio; Dahmouche, K.; Zaioncz, Soraia; Soares, Bluma G.; Pessan, Luiz Antônio

doi:10.1002/polb.21586

Cited by 13 publications

(9 citation statements)

References 40 publications

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“…Na presença de PES, a afinidade química entre os três componentes do sistema teve um papel importante na dispersão da argila e na cristalinidade do PVA. Na ausência de PES, observou-se uma maior dispersão entre PVA e MMT pelo fato de o MMT induzir a nucleação do PVA, enquanto que nos sistemas com PES, a adição de argila favoreceu o crescimento dos cristalitos de PVA, o aumento do grau de cristalinidade e da temperatura de fusão [70,71] .…”

Section: Nanocompósitos Polímero/argila Brasileirosunclassified

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 Polímero/argila Brasileirosunclassified

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

2011

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“…[7][8][9][10] PVA has been also investigated as a widely used commodity polymer due to its good processibility, low cost and enormous applications to paper coating, textile sizing, and flexible water-soluble packaging films. 11,12 These applications stimulate researchers to improve mechanical and thermal properties of thin nanocomposite films, ultimately with the hope of retaining the optical clarity of PVA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Poly(vinyl alcohol)/Synthetic F‐montmorillonite Nanocomposites

Zhang¹,

Cheng²,

Liu³

et al. 2009

Chin. J. Chem.

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F-montmorillonite (F-MMT) was synthesized by a hydrothermal method at 493 K for 72 h, in which a little of hydroxyl radical is replaced by fluoride ion in the silicate structure. Poly(vinyl alcohol) (PVA)/F-MMT nanocomposites were prepared using the synthetic F-MMT by a solution-intercalation method. The F-MMT and PVA/ F-MMT nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that the flake structured F-MMT is homogeneously dispersed in PVA, forming an exfoliated nanocomposite structure. Thermogravimetric analysis, mechanical performance and UV-visible spectroscopy were applied to test the properties of PVA nanocomposites, which indicate that the thermal stability and mechanical performance are enhanced distinctly, without a sacrifice in optical clarity. The improvement of mechanical and thermal properties was attributed to the homogeneous and good dispersion of F-MMT in polymeric matrix and the strong hydrogen bonding between O-H of PVA and F -of F-MMT.

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“…The polyanion chosen for this investigation was sulfonated poly(ethylene terephthalate) (SPET), a synthetic copolymer with a structure similar to that of poly(ethylene terephthalate) (PET), except for the dimethyl isophthalate sodium sulfonate comonomer (Figure ). Our research group have investigated the use of SPET in PEC‐based hydrogels and semi‐interpenetrating (s‐IPN) networks hydrogels . This copolymer was chosen because of its well‐known structure and due to its good solubility in water and high hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

Saccharomyces cerevisae microfiltration performance of polycarbonate membranes containing chitosan‐based polyelectrolyte complexes

Vale

Paranhos

2019

J of Applied Polymer Sci

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Polyelectrolyte complexes (PECs) were prepared using chitosan and sulfonated poly(ethylene terephthalate) by the mixture method. Fourier transform infrared spectroscopy, zeta potential, X-ray diffraction, and thermogravimetric analysis were used to characterize the chemical structure, surface charge, crystallinity, and thermal stability of the PECs. To evaluate how PECs affect the water vapor flux and the microfiltration performance, PECs solutions were spread via casting on polycarbonate microporous membranes. The increase in water vapor flux and in the Saccharomyces cerevisae microfiltration performance indicated that the presence of the PECs acts as fixed charges, changing significantly the transport properties of the polycarbonate matrix.

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Relationships between nanostructure and thermomechanical properties in poly(vinyl alcohol)/montmorillonite nanocomposite with an entrapped polyelectrolyte

Cited by 13 publications

References 40 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

Synthesis and Properties of Poly(vinyl alcohol)/Synthetic F‐montmorillonite Nanocomposites

Saccharomyces cerevisae microfiltration performance of polycarbonate membranes containing chitosan‐based polyelectrolyte complexes

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