Time filter

Source Type

Balāngīr, India

Sahu M.,Utkal University | Sahu M.,Choudwar College | Samal R.,Rajendra College | Sahoo P.K.,Utkal University
Asian Journal of Chemistry | Year: 2015

A new class of technologically advanced material like superabsorbent polymers involved multidisciplinary research started when its potential is recognized. Rice straw-graft-polyacrylamide (RS-g-PAM) superabsorbent polymers was synthesized via simultaneous cross linking and graft copolymerization of acrylamide monomer onto backbone of rice straw using complex initiating system [CuSO4/glycine/ ammonium persulfate] in an aqueous medium without and with N,N-methylenebisacrylamide as crosslinker. The chemically modified rice straw, RS-g-PAM have been characterized by FT-IR and their morphology was studied by scanning electron microscopy. Systematically, variables that affect the water absorbance behaviours of RS-g-PAM SAPs were optimized with the effects of solvent, degree of neutralization and crosslinker concentrations. The tensile and dyeing properties of RS-g-PAM superabsorbent polymers were also studied. A mechanistic pathway in synthesizing RS-g-PAM SAPs was suggested. The biodegradation and water absorbency have been carried out for its ecofriendly nature and better commercialization.

Biswal T.,Utkal University | Biswal T.,Trident Academy of Technology | Samal R.,Rajendra College | Sahoo P.K.,Utkal University
Journal of Applied Polymer Science | Year: 2012

Copolymerization of 2-ethylhexylacrylate and styrene was performed in presence of benzoyl peroxide as initiator at varying concentrations of the comonomers in a microwave oven. Montmorillonite (MMT) clay was added with a view to prepare nanocomposites, which actually enhanced the water absorption capacity and pressure sensitive adhesive properties. The copolymer and its nanocomposite were characterized by Fourier Transform Infrared, 1H- and 13C-NMR, thermogravimetric-differential thermal analysis (TG-DTA), differential scanning calorimeter, scanning electron microscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The MMT layers were partially exfoliated/intercalated during the polymerization process as evident from the XRD and TEM observations. Their adhesive properties, water absorbancy, and biodegradability in different conditions were studied for their future applications. The monomer reactivity ratios were determined using Finemann-Ross and Kelen-Tüdos method. Copyright © 2012 Wiley Periodicals, Inc.

Meher J.K.,SITE | Mishra N.,Rajendra College | Raval M.K.,Gangadhar Meher College | Meher P.K.,Institute for Infocomm Research | Dash G.,Sambalpur University
Communications in Computer and Information Science | Year: 2011

The functions of transmembrane proteins are attributed by kinks (bends) in helices. Kinked helices are believed to be required for appropriate helix-helix and protein-protein interaction in membrane protein complexes. Therefore, knowledge of kink and its prediction from amino acid sequences is of great help in understanding the function of proteins. However, determination of kink in transmembrane α-helices is a computationally intensive task. In this paper we have developed signal processing algorithms based on discrete Fourier transform and wavelet transform for prediction of kink in the helices with a prediction efficiency of ~80%. The numerical representation of the protein in terms of probability of occurrence of amino acids constituted in kinked helices contains most of the necessary information in determining the kink location, and the signal processing methods capture this information more effectively than existing statistical and machine learning methods. © 2011 Springer-Verlag.

Arvind U.,Rajendra College | Kumar S.,Jagdam College
Journal of the Indian Chemical Society | Year: 2010

Acid-base reactions in apolar aprotic media provide a sufficiently close measure of intrinsic acid/base strengths. A study on reaction equilibria between o- and m-methyl benzoic (toluic) acids with the carbinol base of crystal violet in five apolar aprotic solvents of similar Kirkwood polarity function (ε - 1)/(2ε + 1) and significantly different Dimroth-Relchardt's ET (30) and Kamlet-Taft's polarity-polarisabllity π* parameter indicates strongly the overall non-specific solvent effects are contributed by both electrostatic and dispersion interactions, the latter having a more dominant role therein.

Rao D.P.,Da V College | Yadav H.S.,North Eastern Regional Institute of Science and Technology | Yadava A.K.,North Eastern Regional Institute of Science and Technology | Singh S.,P.A. College | Yadav U.S.,Rajendra College
Journal of Coordination Chemistry | Year: 2011

Dioxomolybdenum(VI) complexes [MoO2(mac)](acac)2 (where mac = tetraazamacrocyclic ligands derived from condensation of thenil with 1,2-diaminobenzene or 2,3-diaminopyridine and their reaction with -diketones) have been prepared using dioxometal ion as kinetic template. Tentative structures of the complexes have been proposed on the basis of elemental analysis, infrared, and electronic data. All the dioxomolybdenum(VI) complexes are six-coordinate octahedral ones. © 2011 Taylor & Francis.

Discover hidden collaborations