Obtenção e caracterização de compósitos utilizando poliestireno como matriz e resíduos de fibras de algodão da indústria têxtil como reforço

Borsoi, Cleide; Scienza, Lisete Cristine; Zattera, Ademir J.; Angrizani, Clarissa Coussirat

doi:10.1590/s0104-14282011005000055

Cited by 30 publications

(30 citation statements)

References 18 publications

(28 reference statements)

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“…Similar results were observed by Borsoi et al 19 in studies with cotton fibers. The effect of the coupling agent was not significant in this the initial evaluation.…”

Section: Resultssupporting

confidence: 91%

Behavior in simulated soil of recycled expanded polystyrene/waste cotton composites

et al. 2013

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Composites consisting of waste cotton yarn (CF) from the textile industry and postconsumer expanded polystyrene (EPS) was followed during 90 days of exposure in simulated soil. The mechanical properties, morphologies and chemical natures of the composites were determined before and after exposure in simulated soil. The composites were made using a single-screw extrusion, a twin-screw extrusion and injection molding. The composites showed an increase of the mechanical properties nearly 50% in relation to the recycled expanded polystyrene (rEPS). After exposure in simulated soil the composites presented losses of mechanical properties. Evidence of the oxidation of the samples was demonstrated by the increase in the values of the carbonyl index after 30 days of exposure in simulated soil. Changes in the color of the surface of the sample were observed after 90 days of exposure and are due to the fungi and bacteria colonization on the surface.

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“…Similar results were observed by Borsoi et al 19 in studies with cotton fibers. The effect of the coupling agent was not significant in this the initial evaluation.…”

Section: Resultssupporting

confidence: 91%

Behavior in simulated soil of recycled expanded polystyrene/waste cotton composites

et al. 2013

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“…In particular, the use of natural fibers, such as sisal, jute, curaua, ramie and cotton, in polymer composites has grown in recent years, due to material abundance, low cost and low density, and due to their renewable characteristics. These materials are also less abrasive to processing equipment compared to synthetic fibers, which becomes very important when equipment costs are high [1][2][3] . Major advantages of synthetic fibers over natural fibers include lower moisture absorption of the former and their better adhesion with the polymer matrix 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Cotton fibers are usually found as waste from the textile industry, being usually deposited in landfills and dumps. Although cotton does not have high mechanical properties compared to similar fibers, it can be combined to polymers to yield composites with some mechanical properties superior to that of a pure polymer 3 Borsoi et al 3 studied the incorporation of cotton fiber in thermoplastic matrix composites and obtained satisfactory mechanical results, including higher impact and flexural strength as well as increased flexural modulus. Hashmi et al, 6 studied cotton/unsaturated polyester composites and reported an improvement in structural integrity of the material under sliding wear conditions, a decreased specific wear rate and a higher coefficient of friction with the addition of the fiber.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stacking Sequence on the Mechanical and Dynamic Mechanical Properties of Cotton/Glass Fiber Reinforced Polyester Composites

et al. 2016

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“…Compósitos com fibras naturais têm propriedades mecânicas superiores ao polímero puro [3][4][5] e que a capacidade de processamento dos compósitos reforçados com fibras vegetais está diretamente relacionada ao índice de fluidez da matriz e ao teor de fibras utilizado [6] . Dentre as fibras vegetais utilizadas como reforço em compósitos estão as fibras de curauá.…”

Section: Introductionunclassified

Efeito do tratamento alcalino de fibras de curauá sobre as propriedades de compósitos de matriz biodegradável

Beltrami¹,

Scienza²,

Zattera³

2014

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Resumo: Neste trabalho avaliou-se a influência do tratamento alcalino das fibras de curauá, nas concentrações de 1, 5 e 10%(m/v) de NaOH, nas propriedades dos compósitos com matriz de PHBV e 20% m/m de fibras de curauá. Os compósitos foram moldados por extrusão e injeção e avaliadas suas as propriedades morfológicas, térmicas e mecânicas. Os resultados de FTIR mostraram que o tratamento alcalino promoveu modificações na estrutura das fibras de curauá, comprovadas pela remoção da hemicelulose e da lignina, evidenciadas pela ausência das bandas típicas destes compostos. Nos compósitos com fibras de curauá tratadas com solução de NaOH na concentração de 5% apresentaram um aumento de 30% na resistência à flexão e 12% na resistência ao impacto, quando comparados aos compósitos com fibras sem tratamento. Estes resultados indicam que o tratamento alcalino promoveu uma melhoria na adesão das fibras na matriz, o que melhorou significativamente as propriedades mecânicas dos compósitos. Palavras-chave: Compósitos, PHBV, fibras de curauá, tratamento alcalino. Effect of the Alkaline Treatments of Curauá Fiber on the Properties of Biodegradable Matrix CompositesAbstract: This study investigate the influence of alkaline treatment applied to Curauá fibers, at concentrations of 1, 5 and 10% (w/v) NaOH, on the properties of the composite of PHBV matrix with 20 wt % Curauá fiber. The composites were molded by extrusion and injection and their morphological, thermal and mechanical properties were evaluated. The results showed that alkali treatment caused modifications in the structure of the Curauá fibers by the removal of hemicellulose and lignin, as evidenced by the absence of the typical bands of these compounds in FTIR analysis. It was found an increase of 30% in flexural strength and 12% in impact resistance for the composites with fibers treated in 5% NaOH solution, in relation to composites with fibers without treatment. These results indicate that the alkaline treatment promoted an improvement in the adhesion of the fibers to the matrix, which significantly improved the mechanical properties of the composites. However, concentrations of NaOH solution different from 5% may have a deleterious effect on the mechanical properties of the fibers and composites.

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Obtenção e caracterização de compósitos utilizando poliestireno como matriz e resíduos de fibras de algodão da indústria têxtil como reforço

Cited by 30 publications

References 18 publications

Behavior in simulated soil of recycled expanded polystyrene/waste cotton composites

Behavior in simulated soil of recycled expanded polystyrene/waste cotton composites

Influence of Stacking Sequence on the Mechanical and Dynamic Mechanical Properties of Cotton/Glass Fiber Reinforced Polyester Composites

Efeito do tratamento alcalino de fibras de curauá sobre as propriedades de compósitos de matriz biodegradável

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