01658nas a2200217   4500008004100000022001400041245010000055210006900155260010600224300001400330490000700344520076500351653002901116653003201145653003401177653003301211100001901244700002701263700001901290856013101309       2010                        eng d  a0014-305700aSynthesis and biodegradation studies of new copolymers based on sucrose derivatives and styrene0 aSynthesis and biodegradation studies of new copolymers based on   aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY  a1151-11570 v463 a<p>Novel unsaturated esters of sucrose were synthesised directly and in good yields from sucrose using a simple, mild, and selective Mitsunobu procedure. These regioisomerically pure vinyl sugars have been copolymerised with styrene by a free radical process, yielding unbranched linear polymer materials with pendant sucrose moieties. Their physical properties indicate that these polymers have potential technological relevance as amphiphilic and biodegradable materials. Biodegradation tests on the copolymer samples by a fungal (Aspergillus niger) culture method showed a fungal growth &gt;= 60%, indicating good biodegradability and that the copolymers were partiallybio-assimilated during microbial attack. (C) 2010 Elsevier Ltd. All rights reserved.</p>10aBiodegradable copolymers10aBiodegradation culture test10afree radical copolymerization10aVinyl sucrose ester monomers1 aBarros, Teresa1 aPetrova, Krasimira, T.1 aSingh, Raj, P.  uhttps://library.ncl.res.in/content/synthesis-and-biodegradation-studies-new-copolymers-based-sucrose-derivatives-and-styrene-001614nas a2200217   4500008004100000022001400041245015600055210006900211260005500280300001400335490000700349520071100356653002901067653003201096653003401128653003301162100002601195700002701221700001901248856012901267       2010                        eng d  a1422-006700aSynthesis of hydrophilic and amphiphilic acryl sucrose monomers and their copolymerisation with styrene, methylmethacrylate and alpha- and beta-pinenes0 aSynthesis of hydrophilic and amphiphilic acryl sucrose monomers   aPOSTFACH, CH-4005 BASEL, SWITZERLANDbMDPI AGcAPR  a1792-18070 v113 a<p>Herein, we report the synthesis of monomethacryloyl sucrose esters, and their successful free radical homo- and co-polymerisation with styrene, methylmethacrylate, alpha- and beta-pinene. The chemical, physical, structural and surface chemical properties of these polymers, containing a hydrophobic olefin backbone and hydrophilic sugar moieties as side chains, have been investigated. Biodegradation tests of the copolymer samples by a microbial fungal culture (Aspergillus niger) method showed good biodegradability. The chemical structure and surface chemistry of the synthesized homo- and co-polymers demonstrate their potential technological relevance as amphiphilic and biodegradable polymers.</p>10aBiodegradable copolymers10aBiodegradation culture test10afree radical copolymerization10aVinyl sucrose ester monomers1 aBarros, Maria, Teresa1 aPetrova, Krasimira, T.1 aSingh, Raj, P.  uhttps://library.ncl.res.in/content/synthesis-hydrophilic-and-amphiphilic-acryl-sucrose-monomers-and-their-copolymerisation-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