Morphological and thermomechanical characterization of thermoplastic starch/montmorillonite nanocomposites

Schlemmer, Daniela; Angélica, Rômulo Simões; Sales, Maria J. A.

doi:10.1016/j.compstruct.2009.10.034

Cited by 100 publications

(79 citation statements)

References 20 publications

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“…Dos vários materiais inorgânicos, a MMT é o que mais tem atraído atenção; por apresentar elevada resistência química e térmica, agregando o fato de ser um material abundante, barato e de origem natural [20,21] . Além disso, na literatura existem vários estudos comprovando que a incorporação de MMT melhora as propriedades mecânicas e térmicas de vários polímeros, através da obtenção de nanocompósitos com MMT, quando comparados com o polímero puro [22][23][24] . O interesse na obtenção de nanocompósitos de polímero condutor com MMT resulta do efeito sinérgico entre os componentes inorgânicos e orgânicos em nível molecular, permitindo alcançar propriedades que não poderiam ser atingidas a partir dos componentes individuais, tal como: o controle da condutividade elétrica e estabilidade térmica [14,[25][26][27] .…”

Section: -Obtenção De Nanocompósitos Condutores De Montmorilonita/polunclassified

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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Resumo: Nanocompósitos de montmorilonita/polipirrol (MMT/PPy) foram preparados a partir da polimerização in situ do pirrol na presença de argila, bentonita sódica natural, (MMT-Na + ) em solução aquosa com ou sem surfactante aniônico, dodecil sulfato de sódio (SDS), utilizando-se o cloreto de ferro (III) hexahidratado (FeCl 3 .6H 2 O), como oxidante. A estrutura e propriedades dos nanocompósitos obtidos pela polimerização in situ do pirrol na presença de SDS (MMT/PPy.SDS) e sem surfactante (MMT/PPy) foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR), difração de raios X (DRX), microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), análise termogravimétrica (TG) e método padrão quatro pontas. Os difratogramas dos nanocompósitos revelaram que o espaçamento basal d 001 da MMT (1,42 nm) foi alterado para valores maiores, indicando a intercalação do PPy na MMT para ambos os nanocompósitos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompósitos de MMT/PPy.SDS confirmaram que a presença do SDS na reação promoveu, além da intercalação, esfoliação parcial da argila. Os nanocompósitos MMT/PPy.SDS apresentaram condutividade elétrica (9,50 S/cm) maior do que o nanocompósito de MMT/PPy (4,44 S/cm). A presença da argila melhorou de forma significativa a estabilidade térmica do PPy. Palavras-chave: Polipirrol, montmorilonita, nanocompósitos, condutividade elétrica. The Preparation of Montmorillonite/polypyrrole Nanocomposites: The Effect of Surfactant Incorporation on the Structure and PropertiesAbstract: Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were prepared by the in situ polymerization of pyrrole in the presence of clay, natural sodium bentonite, (MMT-Na + ) in aqueous solutions with or without an anionic surfactant, sodium dodecyl sulfate (SDS), using Iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) as oxidant. The structure and properties of the nanocomposites obtained by the in situ polymerization of pyrrole in the presence of SDS (MMT/PPy.SDS) and without surfactant (MMT/PPy) were compared and evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis and the four-point probe method. The XRD patterns of the MMT/PPy composites shows that the d 001 spacing in MMT (1.42 nm) was changed to higher values, indicating the intercalation of PPy on MMT for both nanocomposites. The XRD pattern, SEM and TEM images of the MMT/PPy.SDS nanocomposites confirmed that the presence of SDS in the reaction medium promoted, beyond intercalation, the partial exfoliation of the clay. The MMT/PPy.SDS nanocomposites showed electrical conductivity (9.50 S/cm) higher than the MMT/PPy nanocomposites (4.44 S/cm). The presence of the clay significantly improved the thermal stability of PPy.

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Section: -Obtenção De Nanocompósitos Condutores De Montmorilonita/polunclassified

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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“…The fundamental importance in its composition is the abundance in unsaturated fatty acids, with the predominance of oleic acid, between 50-80% in mass, and also, the presence of tocopherols and carothenoids [11,14,15] . They have proved to efficiently plasticize starch and enable fabrication of films by casting [2,3,7,11] . A step further consisted on the preparation of bionanocomposites of plasticized starch and lamellar oxides, such as montimorillonite clay, for improved thermal and barrier properties [1,2,7,8,10,12] .…”

Section: Introductionmentioning

confidence: 99%

“…However, all these products demand for starch with some level of chemical manipulation, because in its natural form starch presents low film processability and poor mechanical properties [2][3][4][5] . Starch is a semi-crystalline biopolymer [5] mainly formed by two components with repeating α-D-glucopyranosyl units, although other components such as proteins and lipids are present in small ammouts.…”

Section: Introductionmentioning

confidence: 99%

“…A common approach for improving starch film ability is plasticization, which can be efficiently and environmentally friendly achieved with small amounts of vegetable oils [9] and its fatty acids [2,7,[10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

“…A step further consisted on the preparation of bionanocomposites of plasticized starch and lamellar oxides, such as montimorillonite clay, for improved thermal and barrier properties [1,2,7,8,10,12] . Therefore, plasticization is an essential step to allow the use of starch in advanced biodegradable materials [2,3,7,12] .…”

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics studies of amylose plasticized with Brazilian Cerrado oils: part I

et al. 2018

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ObstractBiodegradable polymers have become part of the realm of polymer science with specially when associated to renewable sources. Unraveling the plasticizer effect of natural occurring fatty acids in the Brazilian Cerrado on amylose oligomers was aimed in this work in an aqueous environment. Since the interactions within a material are of extreme importance to its molecular behavior, the main focus was directed to the molecular interactions whether intra or intermolecular type. Molecular Mechanics and Dynamics were carried out to shed light on this issue. The simulation results suggest the fatty acids could perform as efficient plasticizers for more complex polysaccharides such as starch. It also highlights the importance the solvation on the system stabilization, thus contributing to a clearer understanding of the chemical interactions role on plasticization. Our results provide a basis for simulating more complex systems such as a clay-mineral which will culminate in the parameterization for mesoscale studies.

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Starch Based Composites for Packaging Applications

Gupta

2011

Handbook of Bioplastics and Biocomposites Engineering Applications

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Morphological and thermomechanical characterization of thermoplastic starch/montmorillonite nanocomposites

Cited by 100 publications

References 20 publications

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Molecular dynamics studies of amylose plasticized with Brazilian Cerrado oils: part I

Starch Based Composites for Packaging Applications

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