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Rajini N.,Kalasalingam University | Winowlin Jappes J.T.,Cape Institute of Technology | Rajakarunakaran S.,Kalasalingam University | Bennet C.,Kalasalingam University
Chinese Journal of Polymer Science (English Edition) | Year: 2013

Studies on the behavior of molecular transport properties such as thermal conductivity, gas permeability, volume and surface resistivity have been carried out for the naturally woven coconut sheath (CS) fiber reinforced composites with the addition of nanoclay and chemical treatment of fiber. The compression molding technique was used to fabricate the coconut sheath/clay reinforced hybrid composites. The morphological studies such as X-ray diffractogram (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) have been carried out for polyester nanocomposites and coconut sheath fiber. The decreased gas permeability, thermal conductivity and volume and surface resistivity have been observed with increasing the weight percentage of nanoclay in polyester matrix. In chemical modifications, the alkali and silane treated coconut sheath reinforced composites have shown great influence on the transport properties due to the increasing hydrophilic nature by the topographical changes at the fiber surface. Dielectric strength has also been reported in this paper for all types of composites. Infra-red (IR) spectra have also been taken to study the physical and chemical structural changes of treated coconut sheath. © 2013 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg. Source

Shanthi K.,Cape Institute of Technology | Murugan D.,Manonmaniam Sundaranar University
Wireless Networks | Year: 2016

In MANET, the most important issues are authentication of data packet in the network. Due to the hostile environment, security is major concern while data transmission. In order to overcome this issue, in this paper, we propose hop by hop group key agreement protocol where each node generates pairwise key for encryption of data. The session key is generated only between the nodes which is carrying the data packet for transmission. The key exchange can be performed between two nodes before data transmission. Ni constructs Lagrange interpolating polynomial with degree n − 1. Each Ni broadcasts the generated polynomial. After that, group key agreement protocol is used to provide complete authentication for those nodes. Simulation result show that the proposed algorithm is efficient as it minimizes bandwidth usage, delay, packet drop, and overhead, as well as fulfills all primary security concern, with improved delivery ratio and throughput. © 2016 Springer Science+Business Media New York Source

Rajini N.,Kalasalingam University | Jappes J.T.W.,Cape Institute of Technology | Rajakarunakaran S.,Kalasalingam University | Prabu M.,Kalasalingam University | Bennet C.,Kalasalingam University
Journal of Applied Polymer Science | Year: 2013

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. Copyright © 2013 Wiley Periodicals, Inc. Source

Senthil Kumar K.,Kalasalingam University | Siva I.,Kalasalingam University | Jeyaraj P.,Indian National Institute of Engineering | Winowlin Jappes J.T.,Cape Institute of Technology | And 2 more authors.
Materials and Design | Year: 2014

This work addresses the results of experimental investigation carried out on free vibration characteristics of short sisal fiber (SFPC) and short banana fiber (BFPC) polyester composites. Influence of fiber length and weight percentage on mechanical properties and free vibration characteristics are analyzed. Composite beam specimen is fabricated with random fiber orientations at17. MPa compression using compression molding machine. Natural frequencies and associated modal damping values of the composite laminates were obtained by carrying out the experimental modal analysis. It is found that an increase in fiber content increases the mechanical and damping properties. For SFPC, 3. mm fiber length and 50. wt% fiber content yielded better properties, whereas for BFPC, 4. mm fiber length and 50. wt% fiber content was the best combination. Scanning electron microscopy was performed to study the interfacial mechanism. © 2013 Elsevier Ltd. Source

Rajini N.,Kalasalingam University | Jappes J.T.W.,Cape Institute of Technology | Rajakarunakaran S.,Kalasalingam University | Jeyaraj P.,Kalasalingam University
Journal of Reinforced Plastics and Composites | Year: 2012

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. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav. Source

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