Estudo das propriedades de compósitos biodegradáveis de amido/glúten de milho/glicerol reforçados com fibras de sisal

Corradini, Elisângela; Agnelli, José Augusto Marcondes; Morais, Luís Carlos de; Mattoso, L. H. C.

doi:10.1590/s0104-14282008000400016

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…As fibras naturais têm sido muito estudadas como reforço de muitos compósitos poliméricos, pois proporcionam diversas vantagens, tais como: a redução de custos do produto final; a baixa densidade; uma menor abrasão durante o processamento; são provenientes de fontes renováveis com grande disponibilidade; geram novas fontes de renda para a população rural; são biodegradáveis, o que reduz a quantidade de resíduos no meio ambiente [5] . Dentre as várias existentes pode-se citar as de juta, sisal, algodão, linho, fibra de palmeira, fibra de coco, fibras feitas de celulose regenerada e curauá.…”

Section: Introductionunclassified

Caracterização de um compósito polimérico biodegradável utilizando Poli (ε-caprolactona) e borra de café

Mei

Oliveira

2017

Polímeros

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ResumoEste trabalho teve por objetivo avaliar a influência do tratamento químico da borra de café em relação as propriedades mecânicas e térmicas, morfologia e suscetibilidade à biodegradação quando utilizada na preparação de compósitos com Poli(ε-caprolactona) comparando-o com o polímero puro. A borra de café foi submetida ao tratamento álcali com hidróxido de sódio, seguida da acetilação. Os compósitos foram preparados utilizando diferentes porcentagens de borra de café. Com tratamento químico houve um aumento na estabilidade térmica da borra de café. Houve um aumento significativo no módulo elástico para o compósito com 10% de borra de café acetilada. As imagens obtidas por MEV mostraram uma parcial interação fibra/matriz para compósitos com borra acetilada. As análises térmicas mostraram que a adição de borra de café deslocou positivamente 10º C o pico máximo de degradação térmica em relação ao polímero puro. As amostras mais suscetíveis à biodegradação foram as que continham borra de café acetilada. Palavras-chave: compósito polimérico, borra de café, poliéster biodegradável. AbstractThis study aimed to evaluate the influence of chemical treatments of coffee grounds in relation to mechanical, thermal and morphological properties, and its susceptibility to biodegradation when used in the preparation of composites with poly (ε-caprolactone) as compared to pure polymer. The coffee grounds were submitted to alkali treatment with sodium hydroxide followed by acetylation. The composites were prepared using different percentages of coffee grounds. There was an increase in the thermal stability of coffee grounds using chemical treatment, and a significant increase of the elastic modulus for the composite with 10% acetylated coffee grounds. The images obtained by SEM showed a partial interaction between fiber/matrix for composites and acetylated coffee grounds. The Thermal analysis showed that the addition of coffee grounds positively shifted 10°C, the maximum peak of thermal degradation, as compared to pure polymer. The most susceptible samples to biodegradation were those that contained acetylated coffee grounds.

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Section: Introductionunclassified

Caracterização de um compósito polimérico biodegradável utilizando Poli (ε-caprolactona) e borra de café

Mei

Oliveira

2017

Polímeros

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“…In this context, natural fibers have been studied as a good alternative for reinforcement being mixed with pure biodegradable polymers or their blends to form composites with reduced environmental impact [8] . Fibers of curaua, jute, sisal, sugarcane, and others have been tested for this purpose [4,[8][9][10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Oat fibers modification by reactive extrusion with alkaline hydrogen peroxide

et al. 2016

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SbstractThe modification of lignocellulosic fibers can enhance their interaction with other materials and alkaline hydrogen peroxide (AHP) is a reagent widely used to promote such modification. This work aimed to modify oat hulls fibers by reactive extrusion using AHP (7 g 100 g -1 of hulls). The modified oat hulls displayed performances comparable to those observed by other researchers using conventional AHP method (without extrusion). The AHP treated oat hulls showed increased luminosity compared to the extruded ones. Fourier transform infrared spectroscopy showed differences between the modified and unmodified structures. The removal of surface compounds resulted in a more open morphology, with greater surface area and greater porosity. Reactive extrusion can be an alternative method for fiber modification with several advantages, such as short processing time and no wastewater generation.

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“…This starch characteristic has attracted a strong interest in conventional polymer market by incorporating it in polymer mixtures 2 . In addition, the use of starch is an excellent alternative for edible films and coatings due to its easy processing, low cost, abundance, biodegradability and edibility [3][4][5][6][7] . The plasticizers are generally, small and low volatile molecules.…”

Section: Introductionmentioning

confidence: 99%