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Saxena M.,Central Institute of Plastic Engineering & Technology | Brahmbhatt H.,Indian Central Salt and Marine Chemicals Research Institute | Anjali Devi D.,Central Institute of Plastic Engineering & Technology | Anjali Devi D.,Haldia Institute of Technology | Bhattacharya A.,Indian Central Salt and Marine Chemicals Research Institute
Desalination and Water Treatment | Year: 2015

Abstract: The thin-film composite membrane is aptly named as thin polyamide layer on the asymmetric polysulfone membrane. These membranes have salt rejection abilities, and the order is NaCl > CaCl2. Addition of NaCl increases (17.39% for 500 mg/L for Memb-II), whereas CaCl2 decreases (5.94% for 500 mg/L for Memb-II) atrazine separation. Surfactant-mediated filtrations showed mixed results. Sodium lauryl sulfate (SLS) results better atrazine separation. SLS (200 mg/L) increases 29.72% separation for Memb-II. Contrary to SLS, Cetyl trimethyl ammonium bromide shows little negative influence (10.91%) and for Triton-X-100 (19.3%) it shows more deterioration effect for the same membrane, keeping the same concentration. © 2015 Balaban Desalination Publications. All rights reserved.


Santhoskumar A.U.,Central Institute of Plastic Engineering Technology | Saravanakumar R.,Central Institute of Plastic Engineering Technology | Palanivelu K.,Central Institute of Plastic Engineering Technology
Asian Journal of Chemistry | Year: 2013

In the present work nanocomposites comprising ultra high molecular weight high density polyethylene and low density polyethylene grafted by maleic anhydride using reactive extrusion method as the host polymers and organoclay filler were prepared by melt compounding. The dependence of their structure and morphology on the preparation condition was studied by X-ray diffraction and scanning electron microscopy. The blends were studied in three different ratios such as 90:10, 70:30, 50:50 of ultra high molecular weight high density polyethylene and low density polyethylene. The difference in mechanical and thermal properties was observed with the addition of the compatibilizer. Several percentages of compatibilizer were added and 5 % of its addition was found to be optimum. The nanocomposites of these blends were also studied with the addition of nanoclay. The resulting composites were evaluated in terms of mechanical properties, dispersion characteristics and thermal properties. Nanocomposite with 70:30 ratios with 3 % nanoclay showed optimum properties. This composite was uses for coating. © Asian Journal of Chemistry 2013.


Santhoskumar A.U.,Central Institute of Plastic Engineering Technology | Lakshmi S.U.,Central Institute of Plastic Engineering Technology | Palanivelu K.,Central Institute of Plastic Engineering Technology
Asian Journal of Chemistry | Year: 2013

Ultra high molecular weight polyethylene is chosen as the base material for this project. With the modification of ultra high molecular weight polyethylene by blending with ethyl vinyl acetate in the ratio of 90:10, 7:30 and 50:50 for imparting polar characteristics to the polyolefin. From the SEM images it was found that the two polymers were not completely miscible. Hence, maleic anhydride was used as the grafting material or compatibilizer. 5 % of Maleic anhydride was found to be optimum which was added along with the above three ratios. This resulted in considerable improvement in degradation temperature, mechanical properties such as tensile strength, impact strength and tensile modulus. The nanoclay as closite Na+ was added. The optimum percentage of the nanoclay was found to be 3 %. The addition of nanoclay showed improvement in the properties. © Asian Journal of Chemistry 2013.


Bose G.K.,Haldia Institute of Technology | Mahapatra K.K.,Central Institute of Plastic Engineering Technology
Advances in Production Engineering And Management | Year: 2014

The correct optimization of process parameters is one of the more important aspects when taking into consideration the majority of manufacturing processes and particularly for processes relating to electrical discharge machining (EDM). It is capable of machining geometrically complex or hard material components that are precise and difficult-to-machine, such as heat-treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. The presented study focused on the electric discharge machining (EDM) of AISI H 13, W.-Nr. 1.2344 Grade: Orvar Supreme for finding out the effect of machining parameters such as discharge gap current (GI), pulse on time (POT), pulse off time (POF) and spark gap (SG) on performance responses such as material removal rate (MRR), surface roughness (Ra) and overcut (OC) using a square-shaped Cu tool with lateral flushing. A well-designed experimental scheme was used to reduce the total number of experiments. Parts of the experiment were conducted within the L27 orthogonal array based on the Taguchi method and significant process parameters were identified using analysis of variance (ANOVA). It was found that MRR is affected by gap current and Ra is affected by pulse on time. Moreover, the signal-to-noise ratios associated with the observed values in the experiments were determined by which factor was most affected by the responses of MRR, Ra and OC. These experimental data are investigated using response surface methodology (RSM) for the effects of four EDM parameters GI, POT, POF and SG on MRR, Ra and OC. Response surfaces and contour plots were considered for exploring the importance of the variables and their levels, so as to optimize the responses. Finally multi-response optimization was carried out by means of overlaid contour plots and desirability functions. © 2014 PEI, University of Maribor. All rights reserved.

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