http://nopr.niscpr.res.in/handle/123456789/22621 2026-10-11T07:02:26Z http://nopr.niscpr.res.in/handle/123456789/22990 Title: Effect of condensation product on bright zinc electrodeposition from sulphate bath Authors: Naik, Y Arthoba; Venkatesha, T V; Nayak, P Vasudeva Abstract: Zinc electroplating is carried out in presence of condensation product formed between <img src='http://www.niscair.res.in/jinfo/smaller.gif' border=0><img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-Alanine and Glutaraldehyde. The bath constituents are optimized through Hull cell experiments. Operating parameters such as <i>p</i>H, temperature, current density are also optimized. Current efficiency and throwing power are measured. Polarization study reveals high shift of potential towards negative direction in the presence of addition agents. Corrosion resistance test indicated good protection of steel by the coating. IR spectrum of the deposit shows the inclusion of the compound. SEM photomicrographs show fine grained deposit in the presence of addition agent. The consumption of brightener in the lab scale is 8 mL for 1000 amp-hour. Page(s): 390-395 2001-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22989 Title: Synthesis, characterisation and evaluation of heated rubber seed oil and rubber seed oil-modified alkyd resins as binders in surface coatings Authors: Aigbodion, A I; Pillai, C K S; Bakare, I O; Yahaya, L E Abstract: Rubber seed oil (RSO) heated at 300 ± 5°C for six hours and RSO-modified alkyd resins were evaluated as binders for surface coatings. During heating of rubber seed oil, the bulk viscosity varied exponentially with time. GPC analysis showed that RSO consists of a very high molecular weight fraction that is uncommon in vegetable oil in addition to free fatty acid, mono-di-, tri-glycerides and oligomeric tryglycerides. Values of <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_n<i> </i>and <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_w of 7393 and 13076 respectively were found for RSO. Heated rubber seed oil (HRSO) gave <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_n of 475 and <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_w of 599: while RSO-modified alkyd samples of oil contents of 40% (I), 50% (II) and 60% (III) gave <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_n<i> </i>of 3234, 1379 and 3304 respectively; and <img src='http://www.niscair.res.in/jinfo/mbar.gif' border=0>_w of 6186, 2147 and 8406 respectively. HRSO is narrowest in size distribution compared to RSO and all the alkyd samples as indicated by their polydispersity indices. RSO was found to be semi-drying as the film remained tacky after long period (about 48h) of exposure. Heating enhanced its drying ability. The HRSO films exhibited reasonable pencil hardness and excellent resistance to acid and salt solution but poor resistance to alkali solution compared to the alkyd samples. The drying ability and chemical resistance of HRSO and RSO-modified alkyd were greatly enhanced by modification with cashewnut shell liquid-formaldehyde resin (10% <i>wl w</i>)<i>.</i> Page(s): 378-384 2001-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22940 Title: The rise and fall of the salitre (sodium nitrate) industry Authors: Wisniak, Jaime; Garces, Ingrid Abstract: The nitrate fields in Chile are exceptional for their mineral content and unknown origin and serve as an excellent example how a chemical technology can arise to create a very large and almost exclusive market, to be sent then almost into oblivion by competing technologies. The income from sodium nitrate export provided for many years almost 50% of the income of the Chilean government and a large part of the world needs for fertilizers. Development of the Haber-Basch process for ammonia synthesis resulted in the crash of the dream and a serious economic crisis for Chile. Page(s): 427-438 2001-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22939 Title: Synthesis of sulphur containing compounds over molecular sieve catalysts Authors: Kamalakar, G; Srinivasu, P; Prasad, M Ramakrishna; Kulkarni, S J; Raghavan, K V Abstract: Cyclization of aliphatic butane 1,4-diol in presence of hydrogen sulphide gas was carried out in the vapour phase. The catalysts used for this reaction are modified and unmodified ZSM-5 and HY molecular sieves. The effect of variation of catalyst and reaction temperature are studied for this reaction. A probable reaction mechanism for the formation of butane dithiol, which is used as protecting agent in the organic synthesis was proposed. Page(s): 425-426 2001-09-01T00:00:00Z