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Bharti Gaur - One of the best experts on this subject based on the ideXlab platform.
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Study on the effects of nanoparticulates of SiC, Al2O3, and ZnO on the mechanical and tribological performance of epoxy-based nanocomposites
Particulate Science and Technology, 2016Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:ABSTRACTIn this research work, mechanical and tribological characteristics of Ortho Cresol novalac epoxy (OCNE)-based nanocomposites filled with nanoparticulates of SiC, Al2O3, and ZnO have been investigated. Also, in these investigations, the influence of wear parameters such as applied normal load, sliding velocity, filler contents, and sliding distance have been explored. The experimental plan for four factors at three levels using face centered composite design (CCD) has been employed by the response surface methodology (RSM) technique. The friction and wear tests were carried out using a pin on disc wear test apparatus under dry sliding conditions. The hardness and flexural strength of nano Ortho Cresol novalac epoxy composites filled with nano (SiC, Al2O3, and ZnO) particulates increases with an increase in the filler contents. Whereas, the tensile strength of these nanocomposites increases with an increase in the filler contents from 1 to 2 wt%, and with a further increase in filler contents the te...
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Morphological, Mechanical and Physio-chemical Performance of Ortho-Cresol Epoxy Novolac Based Vinyl Ester Resin
Polish Journal of Chemical Technology, 2015Co-Authors: Shipra Jaswal, Bharti GaurAbstract:Abstract Vinyl ester resin (VEOCN) was prepared from o-Cresol epoxy resin (EOCN) and methacrylic acid in the presence of triphenyl phosphine as catalyst and hydroquinone as inhibitor with acid value of ~ 7 mg of KOH per gram of solid. O-Cresol based novolac resin (OCN), OCN based epoxy resin (EOCN) and VEOCN were characterized by Fourier transform infra red spectroscopy (FT-IR), 1H-NMR and 13C-NMR. The thermal and mechanical behavior of the samples prepared at 30°C from VEOCN using styrene and methyl-methacrylate respectively as reactive diluents, in the presence of benzoyl peroxide (2 phr) as initiator was studied using Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA) and Universal Testing Machine (UTM). Chemical resistance of above VER samples was also evaluated as a function of % weight loss and with the help of Scanning Electron Microscopy (SEM), upon immersing the VEOCN samples in different solutions for 90 days.
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evaluation of mechanical friction and wear characteristics of nano sic filled Ortho Cresol novalac epoxy composites under dry sliding condition
Advances in Polymer Technology, 2015Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:In this work, Ortho Cresol novalac resin was synthesized in the laboratory and this synthesized resin was further reacted with epichlorohydrin to obtain Ortho Cresol novalac epoxy resin (OCNE). The obtained resin can be characterized by FTIR analysis. The OCNE-based composites were produced by filling the nano-SiC particulates. To explore the mechanical and tribological characteristics of these composites under dry sliding conditions, the effects of nanoparticles on the mechanical, friction, and wear properties of the OCNE composites filled with 1-4 wt% of SiC particulates (40 nm) were evaluated using a pin-on-disk apparatus. The improvement in the mechanical and wear properties was attributed to high strength, high hardness, and good dispersion of nano-SiC particulates, which can enhance the interfacial properties of nanofiller and the epoxy matrix. The lowest coefficient of friction and the specific wear rate of composites were 0.27 and 2.18 × 10 −08 mm 3 /Nm, respectively. A positive synergetic effect was also found, and the proposed quaternary composites might be applicable in practice. The wear mechanisms of these composite specimens were examined with the help of a scanning electron microscope equipped with an energy dispersive x-ray analyzer and an x-ray diffractometer . C � 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21491; View this article online at
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Evaluation of Mechanical, Friction, and Wear Characteristics of Nano‐SiC Filled Ortho Cresol Novalac Epoxy Composites under Dry Sliding Condition
Advances in Polymer Technology, 2014Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:In this work, Ortho Cresol novalac resin was synthesized in the laboratory and this synthesized resin was further reacted with epichlorohydrin to obtain Ortho Cresol novalac epoxy resin (OCNE). The obtained resin can be characterized by FTIR analysis. The OCNE-based composites were produced by filling the nano-SiC particulates. To explore the mechanical and tribological characteristics of these composites under dry sliding conditions, the effects of nanoparticles on the mechanical, friction, and wear properties of the OCNE composites filled with 1-4 wt% of SiC particulates (40 nm) were evaluated using a pin-on-disk apparatus. The improvement in the mechanical and wear properties was attributed to high strength, high hardness, and good dispersion of nano-SiC particulates, which can enhance the interfacial properties of nanofiller and the epoxy matrix. The lowest coefficient of friction and the specific wear rate of composites were 0.27 and 2.18 × 10 −08 mm 3 /Nm, respectively. A positive synergetic effect was also found, and the proposed quaternary composites might be applicable in practice. The wear mechanisms of these composite specimens were examined with the help of a scanning electron microscope equipped with an energy dispersive x-ray analyzer and an x-ray diffractometer . C � 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21491; View this article online at
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synthesis characterization and comparisons of mechanical and tribological behaviour of Ortho and meta Cresol novalac epoxy resin
Asian Engineering Review, 2014Co-Authors: Kali Dass, Chauhan S R, Bharti GaurAbstract:In this study Ortho and meta Cresol novalac epoxy resins were synthesized to study their mechanical and tribological behaviour under dry sliding conditions. The friction and wear tests were carried out on a pin on disc apparatus under applied normal load of 10, 20, 30 and 40 N and different sliding velocity of 0.9, 1.8, 2.7 and 3.6 m/s respectively. To evaluate mechanical properties of these synthesized novalac epoxy resins the tensile, flexural and compression tests have been carried out. It is found that in both novalac epoxies the coefficient of friction decreases with increase in the applied normal load and increases with increase in the sliding velocity where as specific wear rate increases with increase in the applied normal load and decreases with increase in the sliding velocity. It is also found that the mechanical properties of the Ortho Cresol novalac epoxy resins showed better results in comparison to the meta Cresol novalac epoxy. The morphology of these novalac epoxy is studied with the help of (SEM) scanning electron microscope.
C Valla - One of the best experts on this subject based on the ideXlab platform.
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determination of urinary Ortho and meta Cresol in humans by headspace spme gas chromatography mass spectrometry
Journal of Chromatography B, 2005Co-Authors: Silvia Fustinoni, Rosa Mercadante, Laura Campo, L Scibetta, C VallaAbstract:Abstract Ortho-Cresol (o-C) and meta-Cresol (m-C) are minor urinary metabolites of toluene, a widely used chemical with neurotoxicological properties. A new assay for their determination in human urine is here proposed. Urinary Cresol sulphates and glucuronates are submitted to acid hydrolysis, urine is neutralized, added with o-Cresols-d8, and analytes are sampled in the headspace of urine by SPME using a polydimethylsiloxane fiber. Analysis is performed by GC/MS using, for separation, either a SupelcoWax10 (for o-C) or a chiral CP Cresol (for o-C and m-C) column. The method is very specific, with a range of linearity 0–5.0 mg/l, within- and between-run precision, as coefficient of variation,
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Determination of urinary Ortho- and meta-Cresol in humans by headspace SPME gas chromatography/mass spectrometry.
Journal of Chromatography B, 2005Co-Authors: Silvia Fustinoni, Rosa Mercadante, Laura Campo, L Scibetta, C VallaAbstract:Abstract Ortho-Cresol (o-C) and meta-Cresol (m-C) are minor urinary metabolites of toluene, a widely used chemical with neurotoxicological properties. A new assay for their determination in human urine is here proposed. Urinary Cresol sulphates and glucuronates are submitted to acid hydrolysis, urine is neutralized, added with o-Cresols-d8, and analytes are sampled in the headspace of urine by SPME using a polydimethylsiloxane fiber. Analysis is performed by GC/MS using, for separation, either a SupelcoWax10 (for o-C) or a chiral CP Cresol (for o-C and m-C) column. The method is very specific, with a range of linearity 0–5.0 mg/l, within- and between-run precision, as coefficient of variation,
Kali Dass - One of the best experts on this subject based on the ideXlab platform.
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Study on the effects of nanoparticulates of SiC, Al2O3, and ZnO on the mechanical and tribological performance of epoxy-based nanocomposites
Particulate Science and Technology, 2016Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:ABSTRACTIn this research work, mechanical and tribological characteristics of Ortho Cresol novalac epoxy (OCNE)-based nanocomposites filled with nanoparticulates of SiC, Al2O3, and ZnO have been investigated. Also, in these investigations, the influence of wear parameters such as applied normal load, sliding velocity, filler contents, and sliding distance have been explored. The experimental plan for four factors at three levels using face centered composite design (CCD) has been employed by the response surface methodology (RSM) technique. The friction and wear tests were carried out using a pin on disc wear test apparatus under dry sliding conditions. The hardness and flexural strength of nano Ortho Cresol novalac epoxy composites filled with nano (SiC, Al2O3, and ZnO) particulates increases with an increase in the filler contents. Whereas, the tensile strength of these nanocomposites increases with an increase in the filler contents from 1 to 2 wt%, and with a further increase in filler contents the te...
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evaluation of mechanical friction and wear characteristics of nano sic filled Ortho Cresol novalac epoxy composites under dry sliding condition
Advances in Polymer Technology, 2015Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:In this work, Ortho Cresol novalac resin was synthesized in the laboratory and this synthesized resin was further reacted with epichlorohydrin to obtain Ortho Cresol novalac epoxy resin (OCNE). The obtained resin can be characterized by FTIR analysis. The OCNE-based composites were produced by filling the nano-SiC particulates. To explore the mechanical and tribological characteristics of these composites under dry sliding conditions, the effects of nanoparticles on the mechanical, friction, and wear properties of the OCNE composites filled with 1-4 wt% of SiC particulates (40 nm) were evaluated using a pin-on-disk apparatus. The improvement in the mechanical and wear properties was attributed to high strength, high hardness, and good dispersion of nano-SiC particulates, which can enhance the interfacial properties of nanofiller and the epoxy matrix. The lowest coefficient of friction and the specific wear rate of composites were 0.27 and 2.18 × 10 −08 mm 3 /Nm, respectively. A positive synergetic effect was also found, and the proposed quaternary composites might be applicable in practice. The wear mechanisms of these composite specimens were examined with the help of a scanning electron microscope equipped with an energy dispersive x-ray analyzer and an x-ray diffractometer . C � 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21491; View this article online at
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Evaluation of Mechanical, Friction, and Wear Characteristics of Nano‐SiC Filled Ortho Cresol Novalac Epoxy Composites under Dry Sliding Condition
Advances in Polymer Technology, 2014Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:In this work, Ortho Cresol novalac resin was synthesized in the laboratory and this synthesized resin was further reacted with epichlorohydrin to obtain Ortho Cresol novalac epoxy resin (OCNE). The obtained resin can be characterized by FTIR analysis. The OCNE-based composites were produced by filling the nano-SiC particulates. To explore the mechanical and tribological characteristics of these composites under dry sliding conditions, the effects of nanoparticles on the mechanical, friction, and wear properties of the OCNE composites filled with 1-4 wt% of SiC particulates (40 nm) were evaluated using a pin-on-disk apparatus. The improvement in the mechanical and wear properties was attributed to high strength, high hardness, and good dispersion of nano-SiC particulates, which can enhance the interfacial properties of nanofiller and the epoxy matrix. The lowest coefficient of friction and the specific wear rate of composites were 0.27 and 2.18 × 10 −08 mm 3 /Nm, respectively. A positive synergetic effect was also found, and the proposed quaternary composites might be applicable in practice. The wear mechanisms of these composite specimens were examined with the help of a scanning electron microscope equipped with an energy dispersive x-ray analyzer and an x-ray diffractometer . C � 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21491; View this article online at
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synthesis characterization and comparisons of mechanical and tribological behaviour of Ortho and meta Cresol novalac epoxy resin
Asian Engineering Review, 2014Co-Authors: Kali Dass, Chauhan S R, Bharti GaurAbstract:In this study Ortho and meta Cresol novalac epoxy resins were synthesized to study their mechanical and tribological behaviour under dry sliding conditions. The friction and wear tests were carried out on a pin on disc apparatus under applied normal load of 10, 20, 30 and 40 N and different sliding velocity of 0.9, 1.8, 2.7 and 3.6 m/s respectively. To evaluate mechanical properties of these synthesized novalac epoxy resins the tensile, flexural and compression tests have been carried out. It is found that in both novalac epoxies the coefficient of friction decreases with increase in the applied normal load and increases with increase in the sliding velocity where as specific wear rate increases with increase in the applied normal load and decreases with increase in the sliding velocity. It is also found that the mechanical properties of the Ortho Cresol novalac epoxy resins showed better results in comparison to the meta Cresol novalac epoxy. The morphology of these novalac epoxy is studied with the help of (SEM) scanning electron microscope.
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mechanical and dry sliding wear characterization of microsize silicon carbide and aluminum oxide filled Ortho Cresol novalac epoxy composites
Journal of Composite Materials, 2014Co-Authors: Kali Dass, S R Chauhan, Bharti GaurAbstract:In the present work, the synthesized Ortho Cresol novalac epoxy-based composites were produced by filling the microsize silicon carbide and aluminum oxide filler particulates. The friction and wear behaviour of these composites were carried out by a pin on disc apparatus at applied normal load of 10 N to 40 N and sliding velocity of 0.9 m/s, 1.8 m/s, 2.7 m/s and 3.6 m/s under dry sliding conditions. It was found that the microsize silicon carbide and aluminum oxide filler particulates contributed significantly to improve the mechanical properties, friction and wear resistance of the Ortho Cresol novalac epoxy. The coefficient of friction decreases and specific wear rate increases with an increase in the applied normal load. The mechanical properties such as hardness, tensile and flexural strength increases with an increase in the filler content from 0 wt% to 10 wt% and decreases with the filler content of 15 wt%. On the other hand, compression strength increases with an increase in the filler content from...
Silvia Fustinoni - One of the best experts on this subject based on the ideXlab platform.
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determination of urinary Ortho and meta Cresol in humans by headspace spme gas chromatography mass spectrometry
Journal of Chromatography B, 2005Co-Authors: Silvia Fustinoni, Rosa Mercadante, Laura Campo, L Scibetta, C VallaAbstract:Abstract Ortho-Cresol (o-C) and meta-Cresol (m-C) are minor urinary metabolites of toluene, a widely used chemical with neurotoxicological properties. A new assay for their determination in human urine is here proposed. Urinary Cresol sulphates and glucuronates are submitted to acid hydrolysis, urine is neutralized, added with o-Cresols-d8, and analytes are sampled in the headspace of urine by SPME using a polydimethylsiloxane fiber. Analysis is performed by GC/MS using, for separation, either a SupelcoWax10 (for o-C) or a chiral CP Cresol (for o-C and m-C) column. The method is very specific, with a range of linearity 0–5.0 mg/l, within- and between-run precision, as coefficient of variation,
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Determination of urinary Ortho- and meta-Cresol in humans by headspace SPME gas chromatography/mass spectrometry.
Journal of Chromatography B, 2005Co-Authors: Silvia Fustinoni, Rosa Mercadante, Laura Campo, L Scibetta, C VallaAbstract:Abstract Ortho-Cresol (o-C) and meta-Cresol (m-C) are minor urinary metabolites of toluene, a widely used chemical with neurotoxicological properties. A new assay for their determination in human urine is here proposed. Urinary Cresol sulphates and glucuronates are submitted to acid hydrolysis, urine is neutralized, added with o-Cresols-d8, and analytes are sampled in the headspace of urine by SPME using a polydimethylsiloxane fiber. Analysis is performed by GC/MS using, for separation, either a SupelcoWax10 (for o-C) or a chiral CP Cresol (for o-C and m-C) column. The method is very specific, with a range of linearity 0–5.0 mg/l, within- and between-run precision, as coefficient of variation,
M C Ratra - One of the best experts on this subject based on the ideXlab platform.
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thermo oxidative stability of polyethylene in the presence of Ortho Cresol novolak
Polymer Degradation and Stability, 1990Co-Authors: R Thiagarajan, S Sridhar, M C RatraAbstract:Abstract Ortho -Cresol novolak has been used as a thermo-oxidative stabilizer for low density polyethylene. The antioxidant shows good thermal stability and its efficacy has been studied by measuring oxidation induction time by the Differential Thermal Analysis technique. The polymer exhibits increasing stability with increasing concentration of stabilizer, following first order kinetics. The rate of inhibited oxidation, determined by Differential Scanning Calorimeter, is found to be inversely proportional to the concentration of the antioxidant, suggesting a hydrogen abstraction termination mechanism. The catalytic effect of copper has been demonstrated for the stabilized polymer and the Arrhenius plot of the air oven-ageing behavior is observed to be linear between 150°C and 190°C with a projected life of 600 h at 105°C. The additive has no influence on the electrical, mechanical and physical properties on the oxidizable substrate.