Two water soluble acryl terpolymers containing polyvinyl alcohol, acrylamide/acrylic acid and vinyl sulphonic acid （VSA） were synthesized by free radical polymerization in aqueous medium. The morphological structure...Two water soluble acryl terpolymers containing polyvinyl alcohol, acrylamide/acrylic acid and vinyl sulphonic acid （VSA） were synthesized by free radical polymerization in aqueous medium. The morphological structure of the polymers were analysed using FTIR and 1H NMR, while the thermal properties were analysed by TGA and DSC. The inhibitive action of the terpolymers on corrosion of mid-steel in 1 mol. L- 1 HCI was studied using gravimetric, potentiodynamic polarisation and electrochemical impedance spectroscopy （EIS） at 303 K. Both the polymers provided inhibition efficiency around 90% which clearly demonstrate that the grafted poly- mers have effective corrosion inhibiting ability on MS corrosion.展开更多
A silicone acrylate micro-emulsion of multipolymer was prepared by seed emulsion polymerization. The effects of polymerization process, emulsifier rate and amount, initiator rate and amount, polymerization temperature...A silicone acrylate micro-emulsion of multipolymer was prepared by seed emulsion polymerization. The effects of polymerization process, emulsifier rate and amount, initiator rate and amount, polymerization temperature, functional monomers, titration time on performances of emulsion have been discussed in detail.展开更多
Development of uric acid sensor based on molecularly imprinted polymer （MIP） was studi ed. The sensor was developed by coating the imprinted polymethacrylic acid on the surface of a hanging mercury drop ele, ctrode ...Development of uric acid sensor based on molecularly imprinted polymer （MIP） was studi ed. The sensor was developed by coating the imprinted polymethacrylic acid on the surface of a hanging mercury drop ele, ctrode （HMDE） at -1 V （vs. Ag/AgCI） during 60 s. Uric acid was accumulated on the modified electrode at -1 V （vs. Ag/AgC1） during 60 s in acetate buffer pH = 5 and stripped at scan rate of 59 mV/s. Oxidation of uric acid on the surface of modified electrode is irreversible through the diffusion controlled process and polymethacrylic acid is a non-electrical conducting polymer. The current signal obtained from Ehe analysis of uric acid by using HMDE is higher than that of the HMD-palymethacrylic acid （polyMAA）, HMD-MIP and HMD-non imprinted polymer （NIP） electrode. The HMD-MIP has demonstrated its performance as a sensitive voltammetric sensor for uric acid. The modified electrode has been tested for the determination of uric acid in the serum sample with recovery percentage of 95.7% （n = 2）. The limit of detection obtained was 6.0 x 10-10 M.展开更多
Flame heat transfer blockage occurs as fuel vapors, soot and products of combustion near a burning fuel surface block much of the heat feedbacks （including external radiative heat flux） to the fuel surface of a burn...Flame heat transfer blockage occurs as fuel vapors, soot and products of combustion near a burning fuel surface block much of the heat feedbacks （including external radiative heat flux） to the fuel surface of a burning object. Blockage clearly affects burning rates and heat release rates of fires. This needs to be included when calculating flame heat transfer in fire growth models. An understanding of bttrning of materials in small scale fires is of broad and vital importance for predicting their burning performance in large scale fires. The blockage phenomenon was clearly observed and quantitatively measured in experiments that took advantage of the unique capability of the Fire Propagation Apparatus （FPA） of being able to vary the ambient oxygen concentrations. An indirect measurement approach was established which provides an experimental understanding of the concept of the blockage. The measurements were further explained by a one-dimensional steady-state model of a diffusion flame, which focuses on the radiant absorption and emission by the gas-soot mixture of flames. The theoretical model provides a greater understanding of the fundamental knowledge of the blockage. The overall heat transfer blockage factor can be up to 0.3 -0.4 for PMMA and POM. The factor and its components are nearly independent of the external radiation, but increase as the ambient oxygen concentration rises. A comparison between experimental data and model prediction shows a good agreement.展开更多
基金Tamil Nadu State Council for Science and Technology (Tnscst/rfrs/vr/2013-14) for catalysing and financially supporting the research work under the RFRS scheme
文摘Two water soluble acryl terpolymers containing polyvinyl alcohol, acrylamide/acrylic acid and vinyl sulphonic acid （VSA） were synthesized by free radical polymerization in aqueous medium. The morphological structure of the polymers were analysed using FTIR and 1H NMR, while the thermal properties were analysed by TGA and DSC. The inhibitive action of the terpolymers on corrosion of mid-steel in 1 mol. L- 1 HCI was studied using gravimetric, potentiodynamic polarisation and electrochemical impedance spectroscopy （EIS） at 303 K. Both the polymers provided inhibition efficiency around 90% which clearly demonstrate that the grafted poly- mers have effective corrosion inhibiting ability on MS corrosion.
基金Ministry of Science and Technology of China for Major State Basic Research Projects (2002AA322020)
文摘A silicone acrylate micro-emulsion of multipolymer was prepared by seed emulsion polymerization. The effects of polymerization process, emulsifier rate and amount, initiator rate and amount, polymerization temperature, functional monomers, titration time on performances of emulsion have been discussed in detail.
文摘Development of uric acid sensor based on molecularly imprinted polymer （MIP） was studi ed. The sensor was developed by coating the imprinted polymethacrylic acid on the surface of a hanging mercury drop ele, ctrode （HMDE） at -1 V （vs. Ag/AgCI） during 60 s. Uric acid was accumulated on the modified electrode at -1 V （vs. Ag/AgC1） during 60 s in acetate buffer pH = 5 and stripped at scan rate of 59 mV/s. Oxidation of uric acid on the surface of modified electrode is irreversible through the diffusion controlled process and polymethacrylic acid is a non-electrical conducting polymer. The current signal obtained from Ehe analysis of uric acid by using HMDE is higher than that of the HMD-palymethacrylic acid （polyMAA）, HMD-MIP and HMD-non imprinted polymer （NIP） electrode. The HMD-MIP has demonstrated its performance as a sensitive voltammetric sensor for uric acid. The modified electrode has been tested for the determination of uric acid in the serum sample with recovery percentage of 95.7% （n = 2）. The limit of detection obtained was 6.0 x 10-10 M.
文摘Flame heat transfer blockage occurs as fuel vapors, soot and products of combustion near a burning fuel surface block much of the heat feedbacks （including external radiative heat flux） to the fuel surface of a burning object. Blockage clearly affects burning rates and heat release rates of fires. This needs to be included when calculating flame heat transfer in fire growth models. An understanding of bttrning of materials in small scale fires is of broad and vital importance for predicting their burning performance in large scale fires. The blockage phenomenon was clearly observed and quantitatively measured in experiments that took advantage of the unique capability of the Fire Propagation Apparatus （FPA） of being able to vary the ambient oxygen concentrations. An indirect measurement approach was established which provides an experimental understanding of the concept of the blockage. The measurements were further explained by a one-dimensional steady-state model of a diffusion flame, which focuses on the radiant absorption and emission by the gas-soot mixture of flames. The theoretical model provides a greater understanding of the fundamental knowledge of the blockage. The overall heat transfer blockage factor can be up to 0.3 -0.4 for PMMA and POM. The factor and its components are nearly independent of the external radiation, but increase as the ambient oxygen concentration rises. A comparison between experimental data and model prediction shows a good agreement.
