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Pervin R.,University of Calcutta | Mondal S.,University of Calcutta | Goswami L.,KIIT University | Vijayabaskar V.,Balmer Lawrie and Co. Ltd | Bandyopadhyay A.,University of Calcutta
Polymers and Polymer Composites | Year: 2015

This paper demonstrates interesting contrasts between physical, mechanical and rheological properties of double network hybrids developed from high (30 wt.%) and low (9 wt.%) methyl acrylate containing poly (ethylene-co-methyl acrylate) and poly (ethylene-co-octene) thermoplastic elastomer. The compositions were designed adopting a Taguchi L9 statistical model. The model was espoused to consider a wide range of blend compositions and process conditions for optimization. The majority of the low methyl acrylate containing hybrids showed normal correlation between mechanical and other physical properties with the net gel content while for the other variety, they were ambiguous. The reason was investigated and it was found to be due to the influence of the nature of crosslinks formed between the phases which controlled the properties in the latter. Based on the results, finally, two blend compositions were chosen from each set as the most optimized formulations for future study. ©Smithers Information Ltd., 2015. Source


Pervin R.,University of Calcutta | Goswami L.,Kalinga Institute of Industrial Technology | Vijayabaskar V.,Balmer Lawrie and Co. Ltd | Bandyopadhyay A.,University of Calcutta
Polymers and Polymer Composites | Year: 2015

Polar monomers are often grafted onto poly(ethylene-co-octene) [POE] to expand its application spectrum. However, the process frequently involves cautious handling of reactive monomers and hazardous solvents. On the contrary, the present work deals with similar modification but using a polymer, poly(ethylene-co-vinyl acetate) [EVA] in the melt through the formation of a double network hybrid using an external crosslinker. POE is an important new generation elastomer having great balance between physical and mechanical properties but its polarity needs to be improved for furthering its uses in industrial oil resistant applications and surface adhesion with other agents. The POE (major component)-EVA (minor component) hybrid compositions were designed using Taguchi statistical technique for optimization. Physico-mechanical properties like tensile, stress relaxation, hysteresis, rheological properties like pseudoplastic index, die swell and solvent swelling kinetics were investigated. The results were found depended on the network morphology of the hybrids. One composition was finally selected which produced better balance between all physico-rheological properties. © Smithers Information Ltd., 2015. Source


Janardhanan R.,Balmer Lawrie and Co. Ltd | Vijayabaskar V.,Balmer Lawrie and Co. Ltd | Reddy B.S.R.,CSIR - Central Leather Research Institute
Journal of the American Leather Chemists Association | Year: 2012

Amphoteric surfactant based fatliquors are outstanding performers in the leather industry because of their excellent surfactant properties, low toxicity, good biodegradability, excellent resistance to hard water, antistatic properties, good emulsification, dispersion and compatibility with other agents. This paper reports on the preparation of a new amphoteric surfactant, diethylamino-lauryl itaconate (DEALI) through the synthesis of lauryl itaconate (LI) based anionic polymerisable surfactant ("Surfmer"). DEALI and LI were characterized by FT-IR and 1H NMR spectra. Properties of both DEALI and LI such as surface tension at different concentrations, critical micelle concentration, contact angle, surface energy, emulsification power, zeta potential and particle sizes were measured. The Isoelectric Point (IEP) of DEALI was determined. The amphoteric surfactant (DEALI) and the anionic surfactant (LI) were formulated as fatliquors and applied on wet blue cow leather, against each other. Fatliquor imparted properties on the leather were measured qualitatively and quantitatively. Scanning Electron Microscopic studies of the resultant leather was carried out and found to have better performance due to deeper penetration of the amphoteric surfactant. This work provides a lead for the development of new and better fatliquoring agents. Source


Janardhanan R.,Balmer Lawrie and Co. Ltd | Vijayabaskar V.,Balmer Lawrie and Co. Ltd | Reddy B.S.R.,CSIR - Central Leather Research Institute
Journal of the American Leather Chemists Association | Year: 2012

A change of molecular structure improves the surface active efficiency of new generation gemini surfactants. As a result, it was confirmed that the dosage could be reduced considerably in industrial applications as performance chemicals, leading to economically quantifiable benefits. The performance of newly synthesized gemini surfactant based sulfonated dimeric malenised soya fatty acid bridged with butane diol was evaluated as a leather fatliquor. The chemical parameters of the fatliquors were analysed and tested on leather. The properties imparted by the fatliquor to leather were studied qualitatively and quantitatively. SEM studies of the treated leathers revealed better penetration of the gemini surfactant based fatliquor compared to the control. Results were correlated in terms of emulsification power, zeta potential and particle size of the surfactants, found to be better than the conventional surfactant. The surface energy was calculated for the fatliquors and found to be equal. Source


Pervin R.,University of Calcutta | Goswami L.,KIIT University | Vijayabaskar V.,Balmer Lawrie and Co. Ltd | Bandyopadhyay A.,University of Calcutta
Journal of Applied Polymer Science | Year: 2012

Process parameters of poly (ethylene-co-vinyl acetate) (EVA)-modified poly (ethylene-co-1-octene) (POE)-interpenetrating, double network blend was designed through Taguchi L9 orthogonal array as a novel approach for complete optimization of engineering and solvent-swelling properties. Influence of different factors like EVA and peroxide concentrations, blending temperature, and blending time on gel content, tensile modulus, tensile strength, ultimate elongation were statistically calculated. Results showed good correlation between mathematical and physical inferences. Stress relaxation, hysteresis and other physico-mechanicals like total elongation, solvent-swelling, etc., were interestingly depended upon the nature of dominantly crosslinked phase instead of net crosslinking of the network hybrids. Sorption, on the other hand, depended on the hydrophobic-hydrophilic property of the surfaces. The series of data produced finally helped to select the best process parameters under which a particular POE-EVA blend composition yielded most balanced physico-mechanicals. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 Copyright © 2012 Wiley Periodicals, Inc. Source

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