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Chattopadhyay S.K.,Shriram Institute for Industrial Research | Khandal R.K.,Shriram Institute for Industrial Research | Uppaluri R.,Indian Institute of Technology Guwahati | Ghoshal A.K.,Indian Institute of Technology Guwahati
Journal of Applied Polymer Science | Year: 2011

Short bamboo fiber reinforced polypropylene composites were prepared by incorporation of various loadings of chemically modified bamboo fibers. Maleic anhydride grafted polypropylene (MA-g-PP) was used as compatibilizer to improve fiber-matrix adhesion. The effects of bamboo fiber loading and modification of the resin on the physical, mechanical, thermal, and morphological properties of the bamboo reinforced modified PP composites were studied. Scanning electron microscopy studies of the composites were carried out on the interface and fractured surfaces. Thermogravimetric analysis and IR spectroscopy were also carried out. At 50% volume fraction of the extracted bamboo fiber in the composites, considerable increase in mechanical properties like impact, flexural, tensile, and thermal behavior like heat deflection temperature were observed. © 2010 Wiley Periodicals, Inc. Source


Aggarwal M.L.,Shriram Institute for Industrial Research | Chacko K.M.,Shriram Institute for Industrial Research | Kuruvilla B.T.,Arjuna Natural Extracts Ltd.
Molecular Medicine Reports | Year: 2016

Curcumin, the active component present in Curcuma longa of the family Zingiberaceae, has a number of pharmacological effects, including potential anti-inflammatory activity. One of the major limitations of curcumin/turmeric extract is its poor absorption through the gastrointestinal tract. Several approaches have been adopted to increase the bioavailability of curcumin, including loading curcumin into liposomes or nanoparticles, complexation with phospholipids, addition of essential oils and synthesizing structural analogues of curcumin. In the present study, the toxicity and safety of one such bioavailable turmeric formulation, curcuminoid-essential oil complex (CEC), the toxicity profile of which has not been reported, were examined using in vivo and in vitro models, as per the guidelines of the Organisation for Economic Co-operation and Development. Investigations of acute toxicity study were performed in rats and mice, and the results revealed no signs and symptoms or toxicity or mortality in any of the animals at the maximum recommended dose level of 5,000 mg/kg body weight. The repeated administration of CEC for 90 days in Wistar rats at a dose of 1,000 mg/kg body weight did not induce any observable toxic effects, compared with corresponding control animals. Mutagenicity/genotoxicity investigations were also performed using a bacterial reverse mutation assay (Ames test), a mammalian bone marrow chromosome aberration test and a mammalian erythrocyte micronucleus test in mice. CEC was found to be non-mutagenic in all three mutagenic investigations. Consequently, the present study indicated that CEC elicited no toxic effects in animals or in vitro. Therefore, following investigations of acute toxicity, repeated dose toxicity and mutagenicity, CEC was deemed a safe, non-toxic pharmacological formulation. Source


Maan A.,Shriram Institute for Industrial Research | Singh A.K.,Shriram Institute for Industrial Research | Mehra D.S.,Thai Acrylic Fibre Co. | Rattan S.,Amity University
Asian Journal of Chemistry | Year: 2016

The aim of this study is to evaluate the feasibility of utilizing fly ash and crumb rubber derived from tyre waste with natural rubber to develop a composite material with improved properties. The composites were evaluated for morphological, thermal and mechanical properties. It was found that with increase in crumb rubber loading, tensile strength, tear strength, abrasion resistance and skid resistance of the composites increased whereas water absorption, compression set, hardness and density decreased up to 120 phr of crumb rubber concentration. SEM micrographs show that fly ash/crumb rubber reinforced natural rubber composites have enhanced rubber-filler interaction to produce more continuous and interlocked structure than fly ash reinforced natural rubber composite. Source


Chattopadhyay S.K.,Shriram Institute for Industrial Research | Khandal R.K.,Shriram Institute for Industrial Research | Uppaluri R.,Indian Institute of Technology Guwahati | Ghoshal A.K.,Indian Institute of Technology Guwahati
Journal of Applied Polymer Science | Year: 2010

Composites were prepared with chemically modified banana fibers in polypropylene (PP). The effects of 40-mm fiber loading and resin modification on the physical, mechanical, thermal, and morphological properties of the composites were evaluated with scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Infrared (IR) spectroscopy, and so on. Maleic anhydride grafted polypropylene (MA-g-PP) compatibilizer was used to improve the fiber-matrix adhesion. SEM studies carried out on fractured specimens indicated poor dispersion in the unmodified fiber composites and improved adhesion and uniform dispersion in the treated composites. A fiber loading of 15 vol % in the treated composites was optimum, with maximum mechanical properties and thermal stability evident. The composite with 5% MA-g-PP concentration at a 15% fiber volume showed an 80% increase in impact strength, a 48% increase in flexural strength, a 125% increase in flexural modulus, a 33% increase in tensile strength, and an 82% increase in tensile modulus, whereas the heat deflection temperature increased by 18°C. © 2010 Wiley Periodicals, Inc. Source


Pramanik N.K.,Shriram Institute for Industrial Research | Haldar R.S.,Shriram Institute for Industrial Research | Niyogi U.K.,Shriram Institute for Industrial Research | Alam M.S.,Jamia Hamdard University
Defence Science Journal | Year: 2014

When Nylon 66 was irradiated by an optimum dose of e-beam in presence of polyurethane as impact modifier in combination with triallyl isocyanurate as cross-linker, a superior performance was observed for the irradiated nylon 66. Significant improvement of properties, such as hardness, tensile strength, flexural modulus and impact strength was obtained on radiation processing of nylon 66 by e-beam. More interestingly, percent water absorption of such irradiated nylon 66 was reduced substantially. Improvement of mechanical properties and reduction of water absorption of irradiated nylon 66 were due to the cross-linking of the polymer system. Increase of cross-linking with dose of e-beam was verified by the increased gel content at higher doses. Irradiated nylon 66 showed better dimensional stability than those achieved with pristine nylon 66. The increase in dimensional stability may be attributed to reduction in crystallinity with increasing dose of e-beam as revealed by DSC studies. © 2014, DESIDOC. Source

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