Polyolefin composites with curaua fibres: Effect of the processing conditions on mechanical properties, morphology and fibres dimensions

Mano, Barbara; Araújo, Joyce R.; Spinacé, Márcia A. S.; Paoli, Marco-Aurélio De

doi:10.1016/j.compscitech.2009.09.002

Cited by 69 publications

(64 citation statements)

References 22 publications

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“…Polypropylene (PP) curaua [116] , flax [92,117,118] , green coconut husks [93,96] , hemp [119] , jute [101,120] , palm [96] , sisal [99,117,121] , sugarcane bagasse [110,122] ,wheat straw [117] Polyethylene (PE) banana [123] , green coconut husks [124] , rice husk [125] , sisal [126] , sugarcane bagasse [22] High density polyethylene (HDPE) banana [127] , curaua [94,116] , sisal [102] , wood [128] High Impact Polystyrene (HIPS) green coconut husks [129] , sisal [130] , sugarcane bagasse [131] Thermoset…”

Section: Thermoplastic Vegetal Fibersmentioning

confidence: 99%

Vegetal fibers in polymeric composites: a review

et al. 2015

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RbstractThe need to develop and commercialize materials containing vegetal fibers has grown in order to reduce environmental impact and reach sustainability. Large amounts of lignocellulosic materials are generated around the world from several human activities. The lignocellulosic materials are composed of cellulose, hemicellulose, lignin, extractives and ashes. Recently these constituents have been used in different applications; in particular, cellulose has been the subject of numerous works on the development of composite materials reinforced with natural fibers. Many studies have led to composite materials reinforced with fibers to improve the mechanical, physical, and thermal properties. Furthermore, lignocellulosic materials have been treated to apply in innovative solutions for efficient and sustainable systems. This paper aims to review the lignocellulosic fibers characteristics, as well as to present their applications as reinforcement in composites of different polymeric matrices.

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Section: Thermoplastic Vegetal Fibersmentioning

confidence: 99%

Vegetal fibers in polymeric composites: a review

et al. 2015

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“…The diameter of the pristine CF is in the range of 30 to 100 μm and each fiber is composed of a bundle of microfibers, which are fibrillated upon extrusion, as demonstrated in a previous work [6] . The extent of fibrillation and fiber breakage is strongly dependent on the processing conditions [7] . Cellulose acetate [8] , polypropylene [9] , post-consumer polypropylene [10] , polyamide-6 [11] and high-density polyethylene [6] were reinforced with CF in our group by processing in a corotating twin-screw extruder.…”

Section: Introductionmentioning

confidence: 99%

Curaua fiber reinforced high-density polyethylene composites: effect of impact modifier and fiber loading

2016

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SbstractShort fibers are used in thermoplastic composites to increase their tensile and flexural resistance; however, it often decreases impact resistance. Composites with short vegetal fibers are not an exception to this behavior. The purpose of this work is to produce a vegetal fiber reinforced composite with improved tensile and impact resistance in relation to the polymer matrix. We used poly(ethylene-co-vinyl acetate), EVA, to recover the impact resistance of high density polyethylene, HDPE, reinforced with Curauá fibers, CF. Blends and composites were processed in a corotating twin screw extruder. The pure polymers, blends and composites were characterized by differential scanning calorimetry, thermogravimetry, infrared spectroscopy, scanning electron microscopy, tensile mechanical properties and Izod impact resistance. EVA used as impact modifier in the HDPE matrix exhibited a co-continuous phase and in the composites the fibers were homogeneously dispersed. The best combination of mechanical properties, tensile, flexural and impact, were obtained for the formulations of composites with 20 wt. % of CF and 20 to 40 wt. % of EVA. The composite prepared with 20 wt. % EVA and containing 30 wt. % of CF showed impact resistance comparable to pure HDPE and improved tensile and flexural mechanical properties.

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“…Em compósitos a forma de dispersão do agente de reforço, as dimensões do mesmo e o agente de acoplagem influenciam muito nas propriedades mecânicas finais [15] . Por outro lado, a forma de dispersão ou forma de processamento também vai definir as dimensões finais da fibra, refletidas na sua razão de aspecto [16] . Portanto, julgamos importante comparar as propriedades mecânicas de compósitos de PP ou PEAD, preparados com 20% em massa de fibras de sisal ou de curauá e 2% em massa de agente de acoplagem, usando o mesmo equipamento de extrusão (extrusora dupla-rosca co-rotante e interpenetrante), o mesmo perfil de rosca e os mesmos perfis de temperatura.…”

Section: Caracterização Das Fibras De Sisal E Curauaunclassified

Poliolefinas reforçadas com fibras vegetais curtas: sisal × curauá

et al. 2011

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Resumo: É crescente o interesse nos compósitos poliméricos reforçados com fibras vegetais curtas em substituição às fibras de vidro, pois as fibras naturais provêm de fontes renováveis, não são abrasivas aos equipamentos de processamento, são biodegradáveis, e possuem baixa densidade comparada às fibras de vidro. Elas apresentam início de degradação em torno de 200 °C, sendo adequadas para reforçar poliolefinas que são processadas até essa temperatura ou termofíxos. Várias fibras vegetais vêm sendo usadas como reforço, dentre elas o curauá e o sisal; no entanto, há grande controvérsia na literatura sobre as propriedades finais dos compósitos. Neste trabalho comparamos as propriedades de compósitos de polietileno de alta densidade ou polipropileno com 20% em massa de fibras curtas de sisal ou de curauá com ou sem agentes de acoplagem. Todos foram processados por extrusão e moldados por injeção, exatamente nas mesmas condições, e os resultados foram comparados em termos das propriedades mecânicas. As fibras de curauá apresentam resistência à tração superior às fibras de sisal e os compósitos com fibras de curauá apresentaram resistência à tração e flexão ligeiramente superior aos compósitos com fibra de sisal. No caso da resistência ao impacto a situação se inverte. Como o sisal é mais frágil que o curauá, durante o processamento ocorre maior quebra da fibra provocando essa diferenciação nas propriedades mecânicas dos compósitos. Palavras-chave: Fibras vegetais, curauá, sisal, compósito polimérico, extrusão. Polyolefins Reinforced with Short Vegetal Fibers: Sisal vs. Curauá Abstract: There is growing interest in reinforced polymer composites using short vegetal fibers to replace glass fibers for several reasons. The composite fibers are produced from renewable resources, being biodegradable and less abrasive to the processing equipment, in addition to possessing a lower density than the glass fibers. Since their thermal degradation onset is at 200 °C, they can be used to reinforce thermoplastics processed below this temperature and thermosets. Several vegetal fibers have been used as reinforcing agent, including sisal and cuaruá. However, there is controversy in the literature about the composites final properties. In this work we compare the properties of composites of high density polyethylene or polypropylene with 20 wt. (%) of short sisal or curauá fibers, with or without a coupling agent. All composites were processed by extrusion and molded by injection, under exactly the same conditions, and the mechanical properties were compared. The curauá fibers presented a higher tensile resistance than the sisal fibers, and the composites with curauá fibers had slightly higher tensile and flexural resistance compared to the sisal fiber composites. The situation is opposite in the impact resistance results, with sisal composites displaying higher impact resistance. Since sisal fibers are more fragile than curauá fibers, during processing there is a higher fracture of sisal in comparison to curauá, inducing these dif...

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Polyolefin composites with curaua fibres: Effect of the processing conditions on mechanical properties, morphology and fibres dimensions

Cited by 69 publications

References 22 publications

Vegetal fibers in polymeric composites: a review

Vegetal fibers in polymeric composites: a review

Curaua fiber reinforced high-density polyethylene composites: effect of impact modifier and fiber loading

Poliolefinas reforçadas com fibras vegetais curtas: sisal × curauá

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