Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI

Kankroli, India

Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI

Kankroli, India
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Chakraborty S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Kar S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Dasgupta S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | And 2 more authors.
Polymer Testing | Year: 2010

This paper presents a detailed characterization and rheometric property study of in-situ sodium activated, organomodified bentonite clay - styrene-butadiene rubber (SBR) nanocomposite. It was found that around 10 phr loading was the optimum level for maximum effect of the organo clay. The WAXD data indicated that at higher loading there was formation of agglomerations in the matrix. It was found that organo clay compound exhibited lower maximum torque in comparison to equivalent amount of carbon black loaded compound. The nanocomposites were also used for partial replacement of N330 carbon black in a highly black loaded compound. Part replacement of the carbon black with nano-clay reduced the maximum rheometric torque in comparison to the control compound. Detail study revealed that with slight modification of the curing package, similar rheometric properties can be obtained. © 2009 Elsevier Ltd. All rights reserved.


Chakraborty S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Kar S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Dasgupta S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | And 2 more authors.
Polymer Testing | Year: 2010

In-situ sodium activated organo modified bentonite clay was also used for partial replacement of the carbon black (N330). Detailed study with the black filled compound revealed that, with slight modification of the curing package, up to 10 phr of the carbon black replacement is possible. At equivalent loading of 5 and 10 phr of in-situ sodium activated organo modified bentonite clay exhibited better properties in comparison to carbon black filled compound. © 2010 Elsevier B.V. All rights reserved.


Chakraborty S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Kar S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Dasgupta S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | And 2 more authors.
Journal of Applied Polymer Science | Year: 2010

This study describes the effect of treatment of Bis(3-triethoxysilyl propyl)tetrasulfane (silane coupling agent, Si69, TESPT) on in situ sodium activated, organo modified bentonite clay - styrene butadiene rubber (SBR) nanocomposite. transmission electron microscopy and Wide angle X-ray diffraction indicated the intercalation as well as partial exfoliation in both the organoclay and sil-ane treated organoclay compound. It was found that about 5% of silane with respect to clay was the optimum dose for the treatment. Around 15% improvement in tensile and tear strength was observed due to silane treatment. Silane treated organoclay exhibited substantial improvement of the fatigue life, compression set, and rebound property. A detailed study of physical property was carried out. A comparison with low and high structure carbon black filled compound was also carried out. It revealed that the silane treatment helped organoclay to achieve comparable property of the compound having equivalent carbon black loading. Probable mechanism of interaction of silane with clay has also been proposed. © 2010 Wiley Periodicals, Inc.


Chakraborty S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Roy P.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Pathak A.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Debnath M.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | And 3 more authors.
Journal of Elastomers and Plastics | Year: 2011

This study describes a method for the composition analysis of the carbon black-filled polychloroprene rubber (CR) compound. Good agreement of the experimental data with the actual value was found. The method is based on three experiments namely thermogravimetric analysis, solvent extraction, and newly developed thermo and thermo-oxidative degradation of the vulcanized CR compound in the presence of nickel catalyst. Thermogravimetric analysis experiment gives the amount of inorganic material in the rubber compound. Solvent extraction gives the extractable amount. Thermo-oxidative degradation experiment gives the polymer amount. In thermo-oxidative degradation experiment, liberated chloride ion was titrated by Mohr's method, and the amount of CR was back calculated from the chlorine content. © The Author(s), 2011.


Dasgupta M.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Gupta S.D.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Bandyopadhyay A.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Bandyopadhyay A.,University of Calcutta
Progress in Rubber, Plastics and Recycling Technology | Year: 2016

Marble powder is a hazardous byproduct of marble industries, which are abundant in the western part of India. It has limited outlets for reuse and is causing severe environmental pollution. An effort has been made to convert this waste marble powder to a useful ingredient for rubber compounds. Accordingly, a chemical treatment has been done to this marble powder and a new material has been derived which is composed of carbonates of mainly calcium and partly magnesium. This material is named as Treated Marble Powder (TMP). TMP is characterized using different analytical techniques and also, to have a comparison with the commercially available whiting (a filler of similar kind for rubber compounds), it is studied in a typical NR/CIIR based innerliner compound for tubeless tyres. Composition analysis reveals that TMP contains 83% calcium carbonate and 14% magnesium carbonate. Compared to raw marble powder and whiting, it has got higher surface area, which is achieved through the chemical treatment. It is also observed that this new material TMP provide some significant advantages to the innerliner compound over whiting, such as higher scorch safety and elongation at break and lower air permeability. Due to these benefits, TMP can be an effective alternative to whiting and by this way, it also generates a new avenue for reuse of waste marble powder to minimize the environmental pollution. © Smithers Information Ltd., 2016.


Bhattacharyya S.K.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Parmar B.S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Bandyopadhyay A.,University of Calcutta
Rubber Chemistry and Technology | Year: 2015

Soft and tacky mass recognized as whole coagulum (Cog) and its toluene soluble fraction (TE) obtained through coagulation of latex of Euphorbia caducifolia Haines has been investigated in this article as green tackifier cum multifunctional agent in natural rubber (NR) based gum compounds. It was observed that inclusion of TE and Cog in the formulations increased tack strength over the control compound (without TE and Cog). At the same loading, autohesion for natural and commercial coumarone indene resin was found comparable. However, phenol formaldehyde (non-heat reactive octyl phenol formaldehyde) resin demonstrated highest tack strength among all the NR compositions studied. Presence of various functional groups such as esters/carboxylic acid, carbon-carbon unsaturation, and so on, in natural resin activated the system and reduced the activation energy barrier for curing. The optimized composition with 5 phr TE showed nearly 5% reductions in activation energy over the control compound. However, no such cure acceleration was displayed by Cog. Unaged tensile properties of the compounds with natural resin at similar proportions to commercial resins were found comparable. Retention of tensile properties after aging for the vulcanizates withTEwas better than those with the commercial resins. For Cog, however, the retention of elongation at break and tensile strength were slightly higher compared with tensile modulus.


Joshi M.,Indian Institute of Technology Delhi | Biswas D.,Indian Institute of Technology Delhi | Sarvanan A.,Indian Institute of Technology Delhi | Purwar R.,Delhi Technological University | Mukhopadhaya R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI
Journal of Applied Polymer Science | Year: 2012

The present study focuses on the preparation and characterization of nylon 6/clay nanocomposite filaments and their cords. Two different organo modified clays: the ditallodimethyl ammonium salt with bentonite clay (Claytone HY), a commercially available clay from M/S Southern Clay products, USA and silane modified montmorillonite clay (Silane-MMT), synthesized in the laboratory were used to prepare nylon 6/clay nanocomposite filaments. The nanocomposite filaments were tested for tensile and creep properties and compared with nylon 6/sodium montmorillonite (Na-MMT) nanocomposite filaments as well as neat nylon 6 filaments. The clay dispersion within the nanocomposite filaments was analyzed by using X-ray diffraction (XRD), scanning electron (SEM), and transmission electron microscopy (TEM). The creep resistant property of all the nanocomposite filaments showed 10-19% improvement over the neat nylon filament. However, there is a marginal improvement in tenacity in case of nylon 6/silane MMT nanocomposite filament as compared to the neat nylon filament. All the nylon 6/clay nanocomposite filaments were converted into the cords and tested for various tire cord related properties such as tensile strength, rubber to cord adhesion, and fatigue resistance. The nanocomposite cords showed a significant improvement in tensile property (7-21%) as well as cord to rubber adhesion strength (34-55%) over the neat nylon cords, however, the fatigue resistance was inferior in case of nanocomposite cords. © 2011 Wiley Periodicals, Inc.


Sinha N.K.,Indira Gandhi Center for Atomic Research | Raj B.,Indira Gandhi Center for Atomic Research | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI
Sealing Technology | Year: 2011

This two-part article describes the ab initio development of fluoroelastomer, static back-up seals for use in the rotatable plugs of a 500-MWe Prototype Fast Breeder Reactor. It covers important results arising from the development and an assessment of the reliability of the seal at the end of its design life, under postulated accidental conditions. The article also highlights larger, potential applications of fluoroelastomers in the nuclear industry, based on this development work. In the first instalment, which appears here, we provide a brief introduction to static back-up seals, discuss the conceptualisation stage and limitations of the conceptual design, and outline the development strategy. © 2011 Elsevier Ltd.


Sinha N.K.,Indira Gandhi Center for Atomic Research | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Dhupia D.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Das Gupta S.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Raj B.,Indira Gandhi Center for Atomic Research
Materials and Design | Year: 2011

The development of a fluorohydrocarbon rubber compound for static backup seals of 500. MWe, Prototype Fast Breeder Reactor (PFBR) is depicted. Variations of a previously developed Viton A-401C based formulation were subjected to processability tests, accelerated heat ageing in air, mechanical characterization and production trials. Finite element analysis and literature data extrapolation were combined with long term ageing to ascertain the life (minimum 10. years) of chosen formulation in reactor under synergistic influences of 110 °C, 23 mGy/h (γ dose rate) and air considering postulated accidental conditions. Validation of test seals and quality assessment indicate that composition and properties of the validated laboratory compound has been translated effectively to the reactor seals, installed recently in PFBR. The tensile and hardness specimens indicated negligible degradation and exceptional thermo-oxidative stability of the seal compound during ageing (32. weeks at 140/170/200 °C) even though interesting manifestations of cross-link exchange and ionic interactions were observed. Compression set results, showing definite trends of change under ageing and stain, were used in Arrhenius and Williams Landel Ferry equations for realistic life prediction. The development provides a foundation to simplify and standardize the design, development and operation of major elastomeric sealing applications of Indian nuclear reactors based on a few qualified compounds. © 2011 Elsevier Ltd.


Sinha N.K.,Indira Gandhi Center for Atomic Research | Ghosh P.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Saha A.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | Mukhopadhyay R.,Hari Shankar Singhania Elastomer and Tyre Research Institute HASETRI | And 3 more authors.
Materials and Design | Year: 2012

Design optimization of static, fluoroelastomer backup seals for the 500. MWe, Prototype Fast Breeder Reactor (PFBR) is depicted. 14 geometric variations of a solid trapezoidal cross-section were studied by finite element analysis (FEA) to arrive at a design with hollowness and double o-ring contours on the sealing face. The seal design with squeeze of 5 mm assures failsafe operation for at least 10. years under a differential pressure of 25. kPa and ageing influences of fluid (air), temperature (110 °C) and γ radiation (23. mGy/h) in reactor. Hybrid elements of 1 mm length, regular integration, Mooney-Rivlin material model and Poisson's ratio of 0.493 were used in axisymmetric analysis scheme. Possible effects of reduced fluoroelastomer strength at 110 °C, ageing, friction, tolerances in reactor scale, testing conditions during FEA data generation and batch-to-batch/production variations in seal material were considered to ensure adequate safety margin at the end of design life. The safety margin and numerical prediction accuracy could be improved further by using properties of specimens extracted from seal. The approach is applicable to other low pressure, moderate temperature elastomeric sealing applications of PFBR, mostly operating under maximum strain of 50%. © 2011 Elsevier Ltd.

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