http://nopr.niscair.res.in/handle/123456789/8563 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8599 Title: PET waste based polyurethane adhesive for rubber joints <br/> <br/>Authors: Desai, S D; Patel, J V; Patel, M R; Sinha, V K <br/> <br/>Abstract: Biomaterial based polyhydric compounds were synthesized and utilized for the depolymerization of PET. Three different oligomers were synthesized by using 5, 15 and 25% PET. Depolymerized oligomers were esterified with dehydrated castor oil (DCO) fatty acids to give polyester polyols. Polyurethane adhesives were synthesized using these polyols for joining rubber-rubber assembly. Bond strength was measured by 180° peel test. Mode of failure was studied by scanning electron microscopy (SEM) analysis. Depolymerised PET oligomers, polyols and polyurethane were characterized by FTIR spectroscopy. Also, polyurethane adhesives were evaluated for their performance and chemical resistance. <br/> <br/>Page(s): 82-87 Wed, 29 Dec 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/8598 Title: Photocatalytic degradation of 3,4-dichlorophenol using TiO₂ in a shallow pond slurry reactor <br/> <br/>Authors: Toor, Amrit Pal; Verma, Anoop; Jotshi, Chand K; Bajpai, Pramod K; Singh, Vasundhara <br/> <br/>Abstract: In the present study, the TiO₂mediated photocatalytic degradation of 3,4-dichlorophenol, as a model compound, has been investigated using a low cost non-concentrating shallow pond slurry reactor at laboratory scale under a variety of conditions. The degradation was studied by monitoring the change in substrate concentration employing UV-spectroscopic analysis, decrease in COD values and increase in chloride formation as a function of irradiation time. The effect of<i style=""> </i>pH, catalyst loading, substrate concentration, UV intensity, aperture to volume ratio of the reactor and presence of electron acceptors such as hydrogen peroxide besides molecular oxygen, on degradation, was studied. The degradation rates were strongly influenced by some of these parameters. The optimum parameters for maximum degradation were determined. The degradation of 3,4-dichlorophenol can be emulated in sunlight using a similar large-scale shallow pond reactor for the solar detoxification in open atmosphere. <br/> <br/>Page(s): 75-81 Wed, 29 Dec 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/8597 Title: Free radical copolymerization of limonene with butyl methacrylate: Synthesis and characterization <br/> <br/>Authors: Sharma, Saroj; Srivastava, A K <br/> <br/>Abstract: The radical copolymerization of monocyclic terpene namely limonene with butyl methacrylate  in xylene at 80±0.1°C for 50 min, using benzoylperoxide (BPO) as an initiator has been carried out under the inert atmosphere of nitrogen. The system follows ideal kinetics <i style="">i.e</i>. <i style="">R</i>_p <img src='/image/spc_char/alpha.gif' border=0> [BPO]^0.5[BMA]^1.0[Lim.]^–1.0. The rate of polymerization (<i style="">R</i>_p) decreases as [limonene] increases, which might be due to penultimate unit effect. The overall energy of activation has been calculated as 34 kJ/mol. The formation of the copolymer is confirmed by the presence of bands at 1727 and 2956 cm^–1 due to ester carbonyl of butyl methacrylate and olefinic C–H stretching of limonene, respectively. Further, the peaks at 3.8–4.2 and 5.0–5.6 <img src='/image/spc_char/delta1.gif' border=0>, were observed in ¹H NMR spectra due to methylene proton adjacent to ester linkage of butyl methacrylate and  trisubstituted olefinic protons of limonene, respectively. The value of reactivity ratios <i style="">r</i>₁(BMA) = 0.125 and <i style="">r</i>₂(Lim.)= 0.026 has been calculated by using Kelen-Tüdos method. Alfrey-Price Q–e parameter for limonene has been calculated as 0.30 and –0.46. The glass transition temperature of the copolymer is determined as 35 ^oC. <br/> <br/>Page(s): 62-67 Wed, 29 Dec 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/8596 Title: Phosphorus-From discovery to commodity <br/> <br/>Authors: Wisniak, Jaime <br/> <br/>Abstract: Phosphorus is nearly the most widely and evenly distributed element on the surface of the earth, and probably the most subdivided. From a laboratory curiosity in the seventeeth century, it became recognized as a fundamental element of life and a large chemical commodity, improving agriculture and industry like very few other discoveries by men have done. <br/> <br/>Page(s): 108-122 Wed, 29 Dec 2004 22:58:59 GMT