Surface treatment of coir (Cocos nucifera) fibers and its influence on the fibers’ physico-mechanical properties

Rahman, M.M.; Khan, Mubarak A.

doi:10.1016/j.compscitech.2007.01.009

Cited by 198 publications

(85 citation statements)

References 14 publications

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“…4 Photographs of geotextiles a UM b C20 and c C40 subjected to mixed spore study after 30 days fibre surface was rough, uneven and highly porous with pore size in range 3-5 lm, with minute thickenings embedded at regular intervals. Similar surface morphology was reported in other works also [36][37][38]. SEM micrographs of unmodified and modified coir fibre samples (C40) before and after biological degradation are shown in Fig.…”

Section: Surface Morphologysupporting

confidence: 68%

“…The closure of surface micropores present on the unmodified coir surface was evident on the surface of modified fibre. Rahman and Khan [38] and Saha et al [39] have also reported smoothening of lignocellulosic fibre surfaces upon surface modification. Unmodified geotextile samples exhibited highest water uptake and lowest tensile strength with passage of time.…”

Section: Surface Morphologymentioning

confidence: 99%

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Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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Results of detailed experimental studies carried out to investigate the resistance of coir geotextiles modified using cashew nut shell liquid (CNSL) to attack of biological organisms are reported. A mixed spore suspension composed of four fungal stains, Chaetomium indicum, Curvularia lunata, Aspergillus fumigatus and Penicillium rubrum was used to study microbial susceptibility of coir geotextiles in humid warm atmosphere. Soil burial studies were carried out under controlled conditions for a period of 240 days to learn the behaviour of geotextiles in contact with specially prepared soil containing a variety of microorganisms. A field study was carried out to investigate the behaviour of coir geotextiles in subterranean termite mounds. The improved properties of modified coir geotextiles were substantiated on the basis of weight loss, moisture absorption, tensile strength and surface morphology. The results show that biological resistance of coir geotextiles was greatly improved by modification with CNSL. Tensile strength of unmodified samples reduced to 19 % whereas modified geotextiles retained 76 % of the initial tensile strength at the end of 240 days of soil burial. SEM images affirm that modification of coir with CNSL obtained in the present work could close the pores on fibre surface and delay biological degradation considerably.

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Section: Surface Morphologysupporting

confidence: 68%

Section: Surface Morphologymentioning

confidence: 99%

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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“…It is known that hydroxyl groups present on the surface of the fibers are responsible for water absorption 23 . As the superficial treatment decreased the number of hydroxyl groups, the water uptake was reduced in the treated samples.…”

Section: Water Absorption Resultsmentioning

confidence: 99%

Polypropylene matrix composites reinforced with coconut fibers

2011

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Polypropylene matrix composites reinforced with treated coconut fibers were produced. Fibers chemically treated (alkalization-CCUV samples) or mechanically treated (ultrasonic shockwave-CMUV samples) were dried using UV radiation. The goal was to combine low cost and eco-friendly treatments to improve fiber-matrix adhesion. Composite samples containing up to 20 vol. (%) of untreated and treated coconut fibers were taken from boxes fabricated by injection molding. Water absorption and mechanical properties were investigated according to ASTM D570-98 and ASTM D638-03, respectively. Electrical characterizations were carried out to identify applications of these composites in the electrical sector. NBR 10296-Electrical Tracking Standard (specific to industry applications) and conductivity measurements were obtained applying 5 kV DC to the samples. CMUV samples containing 5 vol. (%) fiber presented superior tensile strength values (σ~28 MPa) compared to the untreated fibers composite (σ~22 MPa) or alkali treatment (σ~24 MPa). However, CMUV composites containing 10 vol. (%) fiber presented best results for the electrical tracking test and electrical resistivity (3 × 10 7 Ω.m). The results suggest that composites reinforced with mechanically treated coconut fibers are suitable for electrical applications.

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“…Rio de Janeiro, , 2018 2 fibre as cordage, cushion, floor-furnishing, mats, carpets, ropes, etc. [14][15][16][17], this natural raw material has shown great potential in the composite field due to its several valuable properties such as resilience, rigidity, wettability, elongation at break and resistance to weathering [17].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Sodium Bicarbonate Treatment and Its Effect on Epoxy/Polyester Coir Fibre Composites

Oliveira¹,

Santos²,

Vieira³

et al. 2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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This work evaluates a new eco-friendly coir fibre surface treatment method based on sodium bicarbonate (NaHCO3) solution. The fibres were treated with 10 wt.% NaHCO3 solution at different periods (24, 96 and 168 h). A full factorial design 2 1 4 1 was established to investigate the effect of the type of matrix (epoxy and polyester) and treatment time (24, 96 and 168 h) on the mechanical properties of coir fibre composites. Single fibre tensile test revealed a gradual increase in elastic modulus attributed to the treatment time factor. Epoxy and polyester composites led to higher strength and stiffness, respectively, in both tensile and flexural tests. The alkaline treatment did not affect the mechanical strength of the composites. Enhanced tensile and flexural moduli were obtained when the treatment time increased at 96 or 168 hours levels. Finally, the proposed treatment proved to be feasible and efficient in increasing the stiffness of coir fibre composites, besides being less damaging to the environment after disposal.

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Surface treatment of coir (Cocos nucifera) fibers and its influence on the fibers’ physico-mechanical properties

Cited by 198 publications

References 14 publications

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Polypropylene matrix composites reinforced with coconut fibers

Eco-Friendly Sodium Bicarbonate Treatment and Its Effect on Epoxy/Polyester Coir Fibre Composites

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