Vinay Sharma - Academia.edu (original) (raw)

Papers by Vinay Sharma

Response surface methodology (RSM) was used for predicting the optimal condition of glycolysis ti... more Response surface methodology (RSM) was used for predicting the optimal condition of glycolysis time and temperature in the recycling of PET scrap. Central composite rotatable design (CCRD) for two variables at four levels was chosen as the experimental design. The data obtained from measurement of properties were fitted as a two variable second-order equation and were plotted as 3D surface plots using programme developed in MATLAB v.5. Analysis of variance (ANOVA) was used to evaluate the validity of model. The optimum operating conditions for glycolysis time and temperature were 6.5 h and 180 • C, respectively. Under these optimal conditions, the hydroxyl value and glycolysis conversion percentage was 38.14 mgKOH/g and 95%, respectively, at the 0.97 desirability level, whereas the acid value and number average molecular weight (M n) at the same desirability level were 12.2 mgKOH/g and 695 g/mol, respectively.

Polymer …, Jan 1, 2010

The nanocomposites from conjugated linseed oil, acrylic acid, and divinylbenzene are synthesized ... more The nanocomposites from conjugated linseed oil, acrylic acid, and divinylbenzene are synthesized using modified montmorillonite clay and characterized for thermal properties. The wide angle X-ray diffraction results clearly show the distortion of the platy nanolayers of the nanofiller in the polymer matrix as the peak due to the clay disappears in the nanocomposite samples. The dynamic mechanical analysis results show the enhanced storage modulus and transition temperature compared with the pristine polymer. At the glass transition temperature, the storage modulus of nanocomposites is in the range of 17-79 MPa, whereas the pristine polymer shows a storage modulus of 2.1 MPa. The melting peak temperature ranges from 230 to 2608C, which is further confirmed by thermogravimetric analysis (TGA) results. The samples are stable up to 2008C and show a two-stage degradation. POLYM.

Journal of Applied Polymer …, Jan 1, 2009

Kinetics of swelling and sorption behavior of copolymers (based on linseed oil, styrene, divinylb... more Kinetics of swelling and sorption behavior of copolymers (based on linseed oil, styrene, divinylbenzene, and acrylic acid via cationic and thermal polymerization) is studied in tetrahydrofuran (THF) at different temperatures. The values of n in the transport equation are found to be below 0.4, showing non-Fickian or pseudo-Fickian transport in the polymers. The dependence of diffusion coefficient on the composition and temperature has also been studied for the linseed oilbased polymers. The diffusion coefficient in cationic samples decreases with an increase in the oil contents in the samples. In case of thermal samples, the diffusion coefficient first increases up to 30% oil contents and then decreases. The diffusion coefficient decreases with an increase in temperature for all of the linseed oil polymer samples. The sorption coefficient increases with an increase in the oil contents for all samples. The crosslink density (calculated from the THF swelling) ranges from 20.16 to 92.34 Â 10 6 mol/cm 3 for cationic samples and 20.62 to 86.01 Â 10 6 mol/cm 3 for thermal samples.

Journal of Applied Polymer …, Jan 1, 2008

Chemical Engineering Science, Jan 1, 2010

Enzyme and Microbial Technology, Jan 1, 2010

The advent behind microbial fuel cells (MFC) is to provide clean electricity from the waste organ... more The advent behind microbial fuel cells (MFC) is to provide clean electricity from the waste organic material. The MFC produces electricity with the help of microorganisms. In the present review, the biocatalysts or microorganisms used in the MFCs are discussed. The ...

Current Opinion in Solid State and Materials …, Jan 1, 2008

The synthetic polymer vectors in gene therapy have opened a very prospective field for research i... more The synthetic polymer vectors in gene therapy have opened a very prospective field for research in gene therapy and the area in the use of these synthetic polymers as vectors in targeting oncogenes is developing very fast. With the completion of Human Genome Project, the list of genetic targets is growing very fast. These diseases sparked the initiative to create such gene based therapeutics. The low levels of transfection and expression of the gene held non-viral methods are at a disadvantage; however, recent advances in vector technology have yielded molecules and techniques with transfection efficiencies, similar to those of viruses. Amongst these synthetic polymers, polyethylenimine (PEI) and the poly(amidoamine) (PAMAM) dendrimers and poly(b-amino ester) are used extensively as vectors in gene therapy.

Critical Reviews in Solid State and …, Jan 1, 2007

Fuel cells are a replacement for the conventional energy resources. As early as 1839, William Gro... more Fuel cells are a replacement for the conventional energy resources. As early as 1839, William Grove discovered the basic operating principle of fuel cells by reversing water electrolysis to generate electricity from hydrogen and oxygen. A Direct Methanol Fuel Cell (DMFC) operates on liquid fuel, which is one of the exciting varieties of fuel cells. There are many problems with DMFCs such as the high cost of electrolyte membranes, high platinum loading, CO poisoning, fuel cross-over, and so on. In this review, research regarding the solution of these problems will be cited and discussed. The electrical performance (in respect to power density) of the composites for the Nafion R and other perfluorinated membranes in DMFC are evaluated. The effect of these modifications on various aspects, such as mobility of protons through the membrane, permeation of hydronium ions, and cross-over of methanol through the membrane leading to the negative potential, have previously been discussed. Therefore, the main focus of this review is on the effect of composites of Nafion R and non-fluorinated membranes on the DMFC performance.

Progress in Polymer Science, Jan 1, 2008

Innovative technologies and competitive industrial products are reducing the dependence on petroc... more Innovative technologies and competitive industrial products are reducing the dependence on petrochemicals for the production of polymers. Increasing concerns about the deteriorating environment caused by conventional polymers have directed worldwide research toward renewable resources. Vegetable oils are one of the most readily available alternative renewable resources. The functional groups present in natural oils can be activated for condensation polymerization. Accordingly, various types of useful condensation polymers, such as polyurethanes, polyesters and polyethers, are being produced by this route. The incorporation of natural oils into the polymer chain allows tailoring the properties of polyurethane products, for their widespread applications. (P.P. Kundu).

Progress in polymer science, Jan 1, 2006

Emerging technological knowledge is leading research into new ventures. One such is the conversio... more Emerging technological knowledge is leading research into new ventures. One such is the conversion of natural oils to polymers to augment the use of petroleum products as the source of polymeric raw materials. Natural oils, such as vegetable oils, now mainly used in the food industry, offer alternatives, and recent research has studied new routes of synthesis of polymers from natural oils. This review paper discusses the synthesis and characterization of new polymers from different natural oils such as soybean, corn, tung, linseed, castor, and fish oil. The effects of different levels of unsaturation in the natural oils and various types of catalysts and comonomers on the properties of copolymers are considered. r