01860nas a2200241   4500008004100000022001400041245012500055210006900180260007300249300001200322490000800334520096100342653002601303653002601329653002401355653002601379100001901405700001501424700001801439700001901457700001701476856012501493       2006                        eng d  a0376-738800aPoly(urethane methacrylate-co-glycidyl methacrylate)-supported-polypropylene biphasic membrane for lipase immobilization0 aPolyurethane methacrylatecoglycidyl methacrylatesupportedpolypro  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a395-4030 v2853 a<p>Polypropylene (PP) was hydrophilized by coating followed by UV curing of a blend of 2-hydroxyethyl methacrylate (HEMA) terminated polyurethane prepolymer and glycidyl methacrylate (GMA). This allows formation of a hydrophobic membrane with increased surface hydrophilicity, biocompatibility and stability. Candida rugosa lipase (CRL) was covalently immobilized on this membrane using 5% glutaraldehyde as a crosslinking agent for post immobilization stabilization of enzyme on membrane. The membrane obtained was placed in a batch membrane reactor where a model esterification of oleic acid with octanol was studied. Under optimum conditions, the biocatalytic membrane gave a specific activity of 796.27 units/mg and 90.26% activity yield. Moreover, there was 85. 10% retention of specific activity. The biocatalytic membrane was observed to retain about 84.23% of its synthetic activity after six cycles. (c) 2006 Elsevier B.V. All rights reserved.</p>10aCandida rugosa lipase10aEnzyme immobilization10amembrane bioreactor10aurethane methacrylate1 aPujari, N., S.1 aVaidya, Bx1 aBagalkote, S.1 aPonrathnam, S.1 aNene, Sanjay  uhttps://library.ncl.res.in/content/polyurethane-methacrylate-co-glycidyl-methacrylate-supported-polypropylene-biphasic-002043nas a2200253   4500008004100000022001400041245008800055210006900143260007400212300000900286490000700295520112300302653003401425653001401459653002401473653003301497100002701530700003001557700001901587700001801606700001901624700002901643856011701672       2012                        eng d  a1022-976000aPhotopolymerization kinetics of 2-phenylethyl (meth) acrylates studied by photo DSC0 aPhotopolymerization kinetics of 2phenylethyl meth acrylates stud  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcJAN  a98110 v193 a<p>The present work deals with the photopolymerization of 2-phenylethyl (meth)acrylates and estimation of their kinetic parameters. Formulations were made by independently homogenizing the monomers with photoinitiators of two different classes. Two different compositions of photoinitiators were used to study the effect of concentration of photoinitiator on cure kinetics. These compositions obtained were tested for photo curing performance using differential photocalorimetry (DPC) or photo DSC under polychromatic radiation. The heat flow against time was recorded for all formulations under isothermal conditions and the rates of polymerization as well as the percentage conversions were estimated. It was observed that due to a longer timescale for reaction diffusion, the methacrylate formulations showed a higher conversion than acrylate formulations. Other parameters such as induction time, maximum rate and conversion attained as well as the time to attain peak maximum were noted. The photopolymerization and kinetic estimations of the formulations including evaluation of kinetic models are discussed.</p>10aBimolecular termination model10aPhoto DSC10aPhotopolymerization10aVariable autocatalytic model1 aGhorpade, Ravindra, V.1 aBhosle, Sonali, Madhavrao1 aPonrathnam, S.1 aRajan, C., R.1 aChavan, Nayaku1 aHarikrishna, Reghunathan  uhttps://library.ncl.res.in/content/photopolymerization-kinetics-2-phenylethyl-meth-acrylates-studied-photo-dsc-001975nas a2200217   4500008004100000022001400041245013800055210006900193260007300262300001200335490000700347520111400354653002601468653002801494653001901522100002801541700002401569700001901593700002101612856012401633       2012                        eng d  a1381-514800aPoly(allyl glycidyl ether-co-ethylene glycol dimethacrylate) copolymer beads as support for covalent immobilization of L-aminoacylase0 aPolyallyl glycidyl ethercoethylene glycol dimethacrylate copolym  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a687-6940 v723 a<p>Porous epoxy-activated copolymer beads were synthesized as support for the covalent immobilization of Aspergillus melleus L-aminoacylase. Here, a series of copolymer bead were synthesized using either glycidyl methacrylate (GMA) or ally] glycidyl ether (AGE) as monomer units and ethylene glycol dimethacrylate (EGDM) as cross-linking agent. The effect of monomer used and the effect of amount of cross-linking agent on covalent immobilization of aminoacylase were studied. Furthermore, the effect of porogen on immobilization of aminoacylase was also evaluated. AGE-co-EGDM copolymer beads gave higher binding of aminoacylase than GMA-co-EGDM copolymer beads. AGE-co-EGDM copolymer beads synthesized with lauryl alcohol as porogen and having 150% cross-linked density (i.e. AGE-(L)-150) gave maximum enzyme binding. Under optimum conditions, AGE-(L)-150 copolymer beads gave about 130 U/g of aminoacylase activity which corresponds to 72.24% of activity yield. Immobilized aminoacylase showed a broader pH, higher temperature and extended storage stability. (C) 2012 Elsevier Ltd. All rights reserved.</p>10aEnzyme immobilization10aEpoxy-activated support10aL-Aminoacylase1 aVaidya, Bhalchandra, K.1 aIngavle, Ganesh, C.1 aPonrathnam, S.1 aNene, Sanjay, N.  uhttps://library.ncl.res.in/content/polyallyl-glycidyl-ether-co-ethylene-glycol-dimethacrylate-copolymer-beads-support-001871nas a2200229   4500008004100000022001400041245017100055210006900226260007400295300001200369490000800381520094500389653002401334653001301358653003101371653002401402100002901426700001901455700001801474700001801492856013101510       2013                        eng d  a1388-615000aPhotopolymerization of bis-aromatic and alicyclic based solid urethane acrylate macromonomer in the presence of large excess of reactive diluent Kinetics and modeling0 aPhotopolymerization of bisaromatic and alicyclic based solid ure  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcMAY  a805-8130 v1123 a<p>A solid urethane acrylate macromonomer with bis-aromatic as well as alicyclic moieties was synthesized and the kinetics of photopolymerization reactions were studied in the presence of varying concentration of photoinitiator and large excess of reactive diluent using photo DSC. The studies show that the rate of maximum polymerization was found to increase with increase in concentration of photoinitiator while a decrease was observed by an increase in temperature. The final conversion showed a decrease at highest isothermal condition due to vitrification. Estimation of kinetic parameters including applicability of autocatalytic and modified autocatalytic models were investigated by nonlinear regression. It was observed that the modified models gave a better fit with the experimental data and kinetic parameters showed a decrease with increase in temperature and an increase with increase in concentration of photoinitiator.</p>10aAutocatalytic model10akinetics10aLevenberg-Marquardt method10aPhotopolymerization1 aHarikrishna, Reghunathan1 aPonrathnam, S.1 aRajan, C., R.1 aTambe, S., S.  uhttps://library.ncl.res.in/content/photopolymerization-bis-aromatic-and-alicyclic-based-solid-urethane-acrylate-macromonomer-001996nas a2200217   4500008004100000022001400041245012300055210006900178260006900247300001200316490000700328520115900335653003401494653001301528653001701541653002401558100002901582700001901611700001801630856013001648       2014                        eng d  a0300-944000aPhotopolymerization kinetics of bis-aromatic based urethane acrylate macromonomers in the presence of reactive diluent0 aPhotopolymerization kinetics of bisaromatic based urethane acryl  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJAN  a225-2310 v773 a<p>The present work deals with the photopolymerization of bis-aromatic based urethane acrylate macromonomers in the presence of excess end capping agent as reactive diluent and estimation of their kinetic parameters. Formulations were made by independently homogenizing the macromonomers with photoinitiators of three different classes. Three different compositions of photoinitiators were used to study the effect of concentration of photoinitiator on cure kinetics. These compositions obtained were tested for photo curing performance using photo DSC under polychromatic radiation. The heat flows against time were recorded for all formulations under isothermal condition and the rates of polymerization, peak maximum times as well as the percentage conversions were estimated. It was observed that due to a longer timescale for reaction diffusion, formulations with macromonomer containing propoxylated backbone showed higher conversions than the corresponding ethoxylated analogue. The photopolymerization and kinetic estimations of the formulations including evaluation of kinetic model are discussed. (C) 2013 Elsevier B.V. All rights reserved.</p>10aBimolecular termination model10akinetics10aMacromonomer10aPhotopolymerization1 aHarikrishna, Reghunathan1 aPonrathnam, S.1 aRajan, C., R.  uhttps://library.ncl.res.in/content/photopolymerization-kinetics-bis-aromatic-based-urethane-acrylate-macromonomers-presence-001997nas a2200241   4500008004100000022001400041245013000055210006900185260009200254300000800346490000700354520104500361653002001406653003301426653002401459653003001483100002901513700001901542700001901561700001801580700002901598856012801627       2014                        eng d  a1385-772X00aPhotopolymerization of high internal phase emulsions based on 2-ethylhexyl (meth)acrylates and ethylene glycol dimethacrylate0 aPhotopolymerization of high internal phase emulsions based on 2e  a4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLANDbTAYLOR & FRANCIS LTDcJAN  a1-60 v173 a<p>Photopolymerization of high internal phase emulsions based on 2-ethylhexyl (meth)acrylates and ethylene glycol dimethacrylate was carried out in presence of low concentration of different photoinitiators. The stable emulsions obtained by mixing with individual photoinitiators were subjected to low-intensity photopolymerization under UV-Visible lamp. Identical samples were irradiated for differing periods ranging from 2 to 10min at an interval of 2min. The percentage conversions of each monomer in the compositions with respect to the time of irradiation were determined using gas chromatography. It was observed that the formulations containing IRGACURE 819 showed the highest conversion while that containing IRGACURE 2959 showed the least conversion. The former showed high conversion due to the proximity of the absorption maxima of photoinitiator to the major emission line of mercury spectrum at 365nm while the latter showed least conversion due to non-availability of major absorption maxima within the irradiation range.</p>10a(meth)acrylates10ahigh internal phase emulsion10aPhotopolymerization10aresidual monomer analysis1 aHarikrishna, Reghunathan1 aShaikh, A., W.1 aPonrathnam, S.1 aRajan, C., R.1 aBhongale, Sunil, Sitaram  uhttps://library.ncl.res.in/content/photopolymerization-high-internal-phase-emulsions-based-2-ethylhexyl-methacrylates-and-002412nas a2200289   4500008004100000022001400041245015200055210006900207260007900276300001200355490000700367520132100374653002401695653003401719653002401753653002101777653002401798100001801822700002401840700001701864700002701881700001501908700002301923700001901946700002601965856013101991       2016                        eng d  a2194-574800aPrediction of reactivity ratios in free radical copolymerization from monomer resonance-polarity (Q-e) parameters: genetic programming-based models0 aPrediction of reactivity ratios in free radical copolymerization  aGENTHINER STRASSE 13, D-10785 BERLIN, GERMANYbWALTER DE GRUYTER GMBHcFEB  a361-3720 v143 a<p>The principal deficiency of the widely utilized Alfrey-Price (AP) scheme for computing reactivity ratios in the widely used free radical copolymerization is that it ignores important factors, such as the steric effects. This often leads to inaccurate reactivity ratio predictions by AP model. Accordingly, in this study, exclusively data-driven, Q-e parameter-based new models have been developed for the reactivity ratio prediction in free radical copolymerization. In the model development, a novel artificial intelligence formalism known as ``genetic programming (GP)'' that performs symbolic regression has been employed. The GP-based models possess a different functional form than AP model. Further, parameters of GP-based models were fine-tuned using Levenberg-Marquardt (LM) nonlinear regression method. A comparison of AP, GP and GP-LM as well as artificial neural network (ANN)-based models indicates that GP and GP-LM models exhibit superior reactivity ratio prediction accuracy and generalization performance (with correlation coefficient magnitudes close to or greater than 0.9) when compared with AP and ANN models. The GPbased reactivity ratio prediction models developed here due to their higher accuracy and generalization capability have the potential of replacing the widely used AP models.</p>10aAlfrey-Price scheme10afree radical copolymerization10agenetic programming10areactivity ratio10asymbolic regression1 aShrinivas, K.1 aKulkarni, Rahul, P.1 aShaikh, Saif1 aGhorpade, Ravindra, V.1 aVyas, Renu1 aTambe, Sanjeev, S.1 aPonrathnam, S.1 aKulkarni, Bhaskar, D.  uhttps://library.ncl.res.in/content/prediction-reactivity-ratios-free-radical-copolymerization-monomer-resonance-polarity-q-e-1