Injection Molding of Coir Coconut Fiber Reinforced Polyolefin Blends: Mechanical, Viscoelastic, Thermal Behavior and Three-Dimensional Microscopy Study (original) (raw)
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Performance assessments of biocomposites based on palm fibre or pineapple leaf fibre and polyolefins
In this study, polyethylene (PE) or polypropylene (PP) was blended in a twin-screw extruder with several natural fibre contents (0-30% by weight). The proposed materials are then compressed to give composite films of various thicknesses. Palm (P) and pineapple leaf (PAL) fibres were used as fibres or in powder form. In this study, bleached pineapple leaf and palm fibre were generated from wastes from production in Thailand. The objective of the work was to investigate the effect of these natural fibres in reinforced polyolefins. The evolution of chemical structure and crystallinity can be proposed with IR spectroscopy measurements and Differential Scanning Calorimetry thermograms. The assessment of mechanical properties with tensile tests and melt viscoelastic behavior was also carried out. Polyethylene with pineapple leaf fibre showed good performance for reinforcement applications.
Advances in Mechanical Engineering, 2013
Oat hull fibre reinforced polypropylene- (PP-)/polylactide- (PLA-) based biocomposites were fabricated and their process engineering and performances were evaluated. The effect of ethylene propylene-g-maleic anhydride (EP-g-Ma) compatibilizer on mechanical properties of 30 wt% oat hull reinforced PP/PLA (90/10) blend composites was investigated. Thermal degradation parameters of the oat hull fibre were determined using thermogravimetric analysis. The effect of fibre reinforcement on crystallinity of oat hull fibre reinforced PP/PLA composites was studied by differential scanning calorimetry (DSC). Thermomechanical properties of the composites were analyzed by dynamic mechanical analyzer (DMA). The interfacial bonding between the fibre and the matrix was examined using scanning electron microscope (SEM). Significant improvement in tensile strength (40%) and flexural strength (46%) was observed with the addition of EP-g-Ma compatibilizer. DSC analysis of oat hull fibre reinforced comp...
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Polímeros, 2015
A coupled device extruder and injection moulding were used to prepare biocomposites in order to provide a continuous and large-scale production, and overcome the fiber degradation inside the extruder. Two types of biocomposites were prepared, Sisal/poly(buthylene adipate-co-terephthlate)-PBAT and Juta/poly(lactide acid)/poly(buthylene adipateco-terephthlate) blend. The biocomposites were prepared with fiber as-received and alkaline treated. The mechanical properties of biocomposites were increased by the fibers content; and the alkaline treatment was efficient to promote a good adhesion between fiber and polymer. In the case of the Juta fiber, the alkaline treatment used was too strong and led to fiber degradation. The results presented here show an alternative and continuous process to obtain biocomposites with relevant mechanical properties using fiber roving and avoiding fiber degradation.
Biocomposites were prepared using coconut coir fiber that has been subjected to various treatments and polylactic-acid (PLA) as a matix. The volume fraction of the fibers in the PLA composites was fixed at 40 %. The composite with NaOH-treated fiber absorbed the most water. In general, biocomposites made with coconut coir fiber that had been treated with NaOH followed by acrylic acid (AA), had a greater tensile and flexural strength than did untreated or fibers treated only with NaOH. Tensile and flexural strengths of the biocomposites decrease after 6 h and decrease drastically for 192 h following soaking in the water. Tensile fracture and surface biodegradation were observed using the SEM. We also studied the comparison of biocomposites with coir fibers that had been treated with alkali followed by 0.5 % AA for 0.5 h at room temperature and at 70 o C.
Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization
Materia-rio De Janeiro, 2017
This study evaluates the thermal, morphological and mechanical behavior of polypropylene (PP) composite with different natural fibers. The fibers used were wood, sugarcane, bamboo, babassu, coconut and kenaf with and without coupling agent. The thermal, morphological and mechanical properties were evaluated, and a composite PP+GFPP (glass fiber) was used as reference. The interaction at the interface fiber-polymer matrix was studied by scanning electron microscopy (SEM) at the fractured surface of the composites, as expected the presence of maleic anhydride (MA) as coupling agent increasedthe interaction at the interface. The influence of natural fiber in the degree of crystallinity of the composites was evaluated by DSC analysis. The samples of PP+GFPP and PP+(PP-MA)+WF (wood flour) showed better temperature stability. PP+GF also presented superior flexural modulus. The thermal dynamic mechanical behavior was evaluated by DMA, a decrease in storage modulus with increasing temperature was observed, the PP+GF and the composite containing maleic anhydride and sugarcane fiber showed higher modulus. The natural fiber biocomposites studied, consistently presented lower flexural modulus and tensile strength than the reference composite, with and without the use of coupling agent. As expected the use of natural fibers lowered the density compared to the reference material.
Springer, 2012
This paper was focusing on effect of filler content and 3-aminopropyltriethoxysilane (3-APE) coupling agent on the mechanical properties, thermal properties and morphology of polylactic acid (PLA)/ coconut shell powder (CSP) biocomposites. It was found that the increasing of CSP content was decreased the tensile strength and elongation at break of PLA/CSP biocomposites. However, incorporation of CSP increased the modulus of elasticity of PLA/CSP biocomposites. The tensile strength and modulus of elasticity of PLA/CSP biocomposites were enhanced by presence of 3-APE, which attributed to improvement of the filler-matrix interaction. The thermal stability of PLA/CSP biocomposites increased with the filler content and it was improved by 3-APE treatment. Meanwhile, the present of CSP increased the glass transition temperature (Tg) and crystallinity (Xc) of PLA/CSP biocomposites at 30 php of filler content. After 3-APE treatment, Tg and Xc of PLA/CSP biocomposites increased due to the improve of the interfacial bonding. The peak of temperature of crystallization (Tc) presence in PLA/CSP biocomposites indicated the nucleating effect of CSP. Melting temperature (Tm) and Tc of PLA/CSP biocomposites was not significantly affect by filler content and 3-APE. PLA/CSP biocomposites treated with 3-APE was shown better filler-matrix interaction and it was confirmed through SEM micrograph.
FABRICATION AND MECHANICAL BEHAVIOUR STUDY OF COCONUT COIR BASED POLYMER COMPOSITE.
As we know the composite materials using for the light weight application. We have selected polyester resin as matrix, coir fiber as fiber reinforcement and coconut shell powder as particle reinforcement. Coir fiber and coconut shell powder are agricultural by-products and thus they are eco-friendly and biodegradable constituents. Three different volume percentages of PMCs are made (10%, 15%, 20%), so that we can analyze the effect of increase of reinforcements in polyester resin and to determine the optimum mix of reinforcements in the matrix phase. There is a different type of fiber-reinforced plastic processes and it is depends on many factors, such as type of reinforcement and matrix materials, size, shape, quantity, and cost.
Evaluation of Mechanical Properties of Coconut Coir Fiber Reinforced Polymer Matrix Composites
Journal of Nano Research, 2013
Fiber-reinforced polymer composites have played a dominant role for a longtime in a variety of applications for their high specific strength and modulus. The fiber which serves as a reinforcement in reinforced plastics may be synthetic or natural. Past studies show that only synthetic fibers such as glass, carbon etc., have been used in fiber-reinforced plastics. Although glass and other synthetic fiber-reinforced plastics possess high specific strength, their fields of application are very limited because of their inherent higher cost of production. An attempt has been made to utilize the coir, as natural fiber abundantly available in India. Natural fibers are not only strong and lightweight but also relatively very cheap. The present work describes the development and characterization of a new set of natural fiber based polyester composites consisting of coir as reinforcement and epoxy resin. Coir composites are developed and their mechanical properties are evaluated, at five diff...
BioResources
The manufacture of poly(lactic acid) (PLA) composites reinforced with both oil palm empty fruit bunch (EFB) and cotton fiber was investigated. The positive and significant effect of EFB on the heat distortion temperature (HDT) and flexural properties was determined by a 2 k design of experiment study. Adding solid epoxy into the PLA matrix manifested inferior mechanical properties with no improvement to the HDT. The HDT and mechanical properties of the biocomposites were further improved by using an EFB/cotton hybridized system. The PLA/hybridized EFB/cotton biocomposites showed biodegradability and an HDT higher than 100 °C. However, the flowability of the material was retarded at high cotton fractions. Finally, adding talc filler into the biocomposites improved the flowability of the hybridized biocomposite systems, especially at low fiber and high talc contents. Nevertheless, inferior mechanical properties of the biocomposites were found for high talc and low fibers' contents.
Polymer International, 2006
The effect of the blending ratio of a polyurethane matrix and oil-palm empty fruit bunch (EFB) fibers on the mechanical properties of biocomposite boards has been studied. The PU matrix and EFB fibers were used at blending ratios of 25:75, 30:70 and 35:65 (by weight). The mechanical property of hardness was studied. The intention of this study was to produce fiberboard from a vegetable oil-based polyester as the matrix and biomass from the palm oil industry, namely EFB. It was found that the blending ratio with a lower filler loading (35:65) gave higher impact and flexural strengths due to better fiber encapsulation which enhanced the fiber–matrix interfacial adhesion. Copyright © 2005 Society of Chemical Industry