The Effect of Alkali Treatment on Dielectric Properties of<i>Roystonea regia</i>/Epoxy Composites

Goud, Govardhan; Rao, R.N.

doi:10.1080/1023666x.2011.570039

Cited by 37 publications

(3 citation statements)

References 15 publications

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“…To provide better adhesion between the fiber surface and matrix for obtaining improved mechanical properties, the composites were prepared with chemically treated fibers. [8][9][10] Hybrid composites contain more than one fiber or one resin system in a composite laminate. Two or more different fibers used in the same ply are called intra-ply hybrid composite, which possess the combined properties of both fibers.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and free vibration properties of montmorillonite clay dispersed with naturally woven coconut sheath composite

Rajini

Jappes²,

Rajakarunakaran

et al. 2012

Journal of Reinforced Plastics and Composites

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In this investigation, naturally woven coconut sheath is used as a new type of reinforcement. The hybrid composites are developed with the combination of naturally woven coconut sheath/E-glass/nanoclay using unsaturated polyester matrix and the effect of nanoclay on the mechanical and free vibration behavior is studied. It is found that the addition of nanoclay improved the mechanical and damping properties of the composite owing to the improved stiffness of the matrix by better dispersion of clay. In addition, the effect of alkali and silane treatments on fibers and different stacking sequence were investigated. It was observed that the alkali treatment of fibers improved the mechanical properties of the composites when cellulose fiber was present. This investigation presented a peculiar result in the case of silane treatment with the nanoclay, which is in contradiction with the earlier works. The stacking sequence of coconut sheath/coconut sheath/glass with alkali treatment of fibers provides the optimum increase in mechanical strength and free vibration characteristics. X-ray diffraction and transmission electron microscope were performed to understand the dispersion of nanoclay and its strengthening mechanism. In addition, scanning electron microscopy was used for fractography analysis. This investigation suggests an alternative material for the field of composites.

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Section: Introductionmentioning

confidence: 99%

“…To provide better adhesion between the fiber surface and matrix for obtaining improved mechanical properties, the composites were prepared with chemically treated fibers. 8 – 10…”

Section: Introductionmentioning

confidence: 99%

Mechanical and free vibration properties of montmorillonite clay dispersed with naturally woven coconut sheath composite

Rajini

Jappes²,

Rajakarunakaran

et al. 2012

Journal of Reinforced Plastics and Composites

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“…Impact strength of neat UPR is 151 J/m 2 which is very less than the fiber composites. Fibers play a vital role in impact strength of the composites as they act as stress‐transferring medium and resist crack formation . SEM images of SMFs before alkali treatment show that the surface of fiber is covered with a layer of substance, which may include pectin, lignin, and other impurities.…”

Section: Resultsmentioning

confidence: 99%

Extraction of fibers from saccharum munja grass and its application in composites

Singh

Madiwale

Jagtap

et al. 2014

J of Applied Polymer Sci

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With growing environmental awareness, ecological concerns and new legislations, natural fiber-reinforced plastic composites have received increasing attention during the recent decades. The natural fiber composites have many advantages over traditional glass fiber composites, including lower cost, lighter weight, environmental friendliness, and recyclability. This article reports the findings of the studies done on a new fiber, hitherto unexplored, extracted from Saccharum munja grass. The extracted fibers were further treated using sodium hydroxide to improve its performance in composites. Both treated and untreated fiber-reinforced composites were prepared by hand lay-up process using unsaturated polyester resin. Mechanical properties and thermal behavior of the composites were evaluated. The improvement in properties was found for alkali-treated fiber composites. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40829.

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Influence of MMT nanoclay on impedance spectroscopy analysis of naturally woven coconut sheath/polyester hybrid composite

Rajini

Jappes²,

Rajakarunakaran

et al. 2013

J of Applied Polymer Sci

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In this work, the impedance spectroscopy study has been carried out for the naturally woven coconut sheath fiber reinforced composite with the effect of adding different weight percentages of montmorillonite nanoclay and chemical activation of fiber. The dispersion mechanism of nanoclay with polyester, and the modification of the fiber surface have been studied by using X-ray diffractogram, transmission electron microscope and scanning electron microscope respectively. Infra-red spectra have also been taken to study the reactive compounds of treated fibers. The impedance spectrum shows significant improvement in A.C. conductivity, dielectric constant and loss tangent values by the fiber modification, using alkali and silane treatments, due to the structural topography changes at the fiber surface. The highest dielectric strength was found in alkali-treated coconut sheath/polyester composite due to increase in orientation polarization by the absorption of moisture content at fiber surface. The addition of different weight percentages of nanoclay with coconut sheath in all the treated conditions shows significant changes in the dielectric properties.

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The Effect of Alkali Treatment on Dielectric Properties ofRoystonea regia/Epoxy Composites

Cited by 37 publications

References 15 publications

Mechanical and free vibration properties of montmorillonite clay dispersed with naturally woven coconut sheath composite

Mechanical and free vibration properties of montmorillonite clay dispersed with naturally woven coconut sheath composite

Extraction of fibers from saccharum munja grass and its application in composites

Influence of MMT nanoclay on impedance spectroscopy analysis of naturally woven coconut sheath/polyester hybrid composite

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