Mechanical properties, morphology and thermal degradation of a biocomposite of polypropylene and curaua fibers: coupling agent effect.

Mano, Barbara; Araújo, Joyce R.; Paoli, Marco; Waldman, Walter R.; Spinacé, Márcia A. S.

doi:10.1590/s0104-14282013005000025

Cited by 8 publications

(8 citation statements)

References 17 publications

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“…In this formulation, the tensile and flexural moduli increased by 119% and 95%, respectively, demonstrating a reinforcement effect. However, there was a decrease in the impact strength of the composite (62%), which we attribute to its brittleness caused by the vegetal fibers, as observed in the previous studies . The decrease in tensile properties from PA630FB to PA640FB sample is attributed to the poor transfer of mechanical stress in the presence of an excess amount of fibers.…”

Section: Resultssupporting

confidence: 73%

Polyamide‐6 composites reinforced with cellulose fibers and fabricated by extrusion: Effect of fiber bleaching on mechanical properties and stability

et al. 2015

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We prepared polyamide-6 (PA-6) composites using bleached and semibleached cellulose fibers from Eucalyptus species by processing in a corotating interpenetrating twin-screw extruder. PA-6 is a challenging matrix because of its high processing temperature, which overlaps the thermodegradation temperature of the fibers. The selection of the processing conditions for extrusion and the use of the lubricant ethylene bis (stearamide) permitted the production of composites with 20, 30, and 40 wt% of bleached fibers, which are lighter than the corresponding glass fiber composites. Composites with 30 wt% of bleached fibers yield the best mechanical properties and good fiber/matrix interaction, as demonstrated by mechanical tests and scanning electron microscopy. X-ray photoelectron spectroscopy studies showed that the natural moisture in the fibers promotes the fiber/matrix interaction through the formation of ester bonds. We assessed the effect caused by the presence of lignin in the fibers. Composites containing 30 wt% of semibleached fibers maintained the flexural properties and showed small improvements in thermal stability when compared with bleached fiber composites; however, there is a slight decrease in the tensile properties. Through accelerated aging tests, we observed that increased lignin concentration in the fibers reduced the formation of carbonyl compounds on sample surfaces, indicating a stabilization effect. POLYM. COMPOS., 00:000-000, 2015.

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Section: Resultssupporting

confidence: 73%

Polyamide‐6 composites reinforced with cellulose fibers and fabricated by extrusion: Effect of fiber bleaching on mechanical properties and stability

et al. 2015

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“…Lignin is present in plant structures and wood is its main industrial source, particularly those used in the paper industry . Lignin was studied as an antioxidant for rubber and elastomers, composites, and as an antimicrobial . Lignin is biodegradable, carbon neutral, absorbs the UV radiation of sunlight, and, as a by‐product of the paper industry, is available at low cost and in large amounts.…”

Section: Introductionmentioning

confidence: 99%

Lignin as a green primary antioxidant for polypropylene

Gadioli

Waldman

Paoli

2016

J of Applied Polymer Sci

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Lignin and Irganox 1010, a hindered phenol antioxidant, are compared as a primary stabilizer in formulations for polypropylene (PP) by exposition to accelerated aging. The concentration of lignin was adjusted to match the concentration of hindered phenolic groups of the commercial stabilizer. Upon aging, lignin formulation retains the initial mechanical properties longer than the formulation with Irganox 1010. The ratio of the areas of the carbonyl and the hydroxyl infrared absorption bands is proposed as a method to evaluate the photodegradation process. In this aspect, the formulation with lignin also presents better results than the formulation with Irganox 1010. There are two hypotheses for the best performance of lignin in the studied conditions: lower leaching of lignin, due to its crosslinked nature, and leaching of low molar mass products of Irganox 1010 hydrolysis. These results indicate lignin, from the Kraft process of Eucalyptus wood, as a promising green substituent to synthetic hindered phenol stabilizers. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43558.

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“…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. In all cases, the tensile and flexural properties were improved and 20 wt.…”

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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Mechanical properties, morphology and thermal degradation of a biocomposite of polypropylene and curaua fibers: coupling agent effect.

Cited by 8 publications

References 17 publications

Polyamide‐6 composites reinforced with cellulose fibers and fabricated by extrusion: Effect of fiber bleaching on mechanical properties and stability

Polyamide‐6 composites reinforced with cellulose fibers and fabricated by extrusion: Effect of fiber bleaching on mechanical properties and stability

Lignin as a green primary antioxidant for polypropylene

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

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