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Changanācheri, India

Thomas S.P.,Bam College Thuruthicad | Ettolil M.J.,SB College
Journal of Applied Polymer Science | Year: 2010

This study explored the possibility of preparing a new thio accelerator, N-benzylimine aminothioformamide to investigate its synergic accelerator activity in three conventional binary accelerator systems, N-cyclohexyl benzothiazyl sulfenamide, mercapto benzothiazyl disulfide, and tetramethylthiuram disulfide in the sulfur vulcanization of natural rubber. Each system was found effective in reduction of cure time as a further proof of the nucleophilic mechanism suggested in the earlier reports. The vulcanizates of the mixes of the three systems were experimented for evaluating their physicomechanical properties. Most of the properties were found better than those of the reference mixes. Crosslinks were also evaluated for correlating the properties. Based on the evaluated properties, optimum dosage of the new binary systems were derived. © 2010 Wiley Periodicals, Inc. Source

Mathew V.,St Aloysius College | Joseph J.,St Aloysius College | Jacob S.,St Aloysius College | Abraham K.E.,SB College
Indian Journal of Pure and Applied Physics | Year: 2011

Growth of single crystals of strontium malonate has been accomplished using silica gel in glass test tubes. The powder XRD pattern of the sample reveals the strong crystalline nature. The FTIR and FT Raman spectra of the strontium malonate crystals are recorded and the vibrational assignments have been made with possible explanations. From diffuse reflectance spectroscopic (DRS) studies, the band gap of the material is also determined. Source

Mathew V.,St Aloysius College | Jacob S.,St Aloysius College | Xavier L.,St Aloysius College | Abraham K.E.,SB College
Journal of Rare Earths | Year: 2012

Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy (FTIR) and fourier transform (FT) Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum. Source

Saritha A.,Amrita University | Saritha A.,SB College | Joseph K.,Indian Institute of Space Science and Technology | Thomas S.,Mahatma Gandhi University | Muraleekrishnan R.,VSSC
Composites Part A: Applied Science and Manufacturing | Year: 2012

The field of polymer nanocomposites has attracted attention as a method of enhancing polymer properties and extending their utility by using molecular or nanoscale reinforcements rather than conventional particulate filled nanocomposites. These materials exhibit behavior different from conventional composite materials with micro scale structure due to small size of structural unit and high surface to volume ratio. Chlorobutyl rubber nanocomposites were prepared using organically modified cloisite 15 A and characterized using XRD and TEM. The gas barrier properties of the nanocomposites were modeled using the composite theories of permeation and the tortousity factors were predicted. Analysis of mechanical properties, transport and gas barrier properties of the nanocomposites as well as the calculation of break through times show the effectiveness of the material to be utilized as potential gas as well as VOC barrier materials. © 2012 Elsevier Ltd. All rights reserved. Source

Mathew V.,St Aloysius College | Jacob S.,St Aloysius College | Mahadevan C.K.,Physics Research Center | Abraham K.E.,SB College
Materials Letters | Year: 2011

Single crystals of copper malonate trihydrate were grown in silica gel by slow diffusion of copper nitrate by sodium metasilicate gel impregnated with malonic acid. The grown crystal was subjected to dielectric studies and magnetic studies. The dielectric properties of the crystal were analyzed as a function of frequency and temperature. A vibrating sample magnetometer was used to determine the hysteresis properties of the crystals by measuring the magnetic moment for different applied fields. The crystal is found to be weakly ferromagnetic. © 2011 Elsevier B.V. All rights reserved. Source

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