03201nas a2200289 4500008004100000022001400041245009400055210006900149260006700218300001400285490000700299520215700306653000602463653001602469653005502485653002202540653002702562653004802589653001802637653003602655653002402691653003102715653001202746100001502758700001602773856012202789 2005 eng d a0887-624X00aNovel tridentate nitrogen donor as ligand in copper catalyzed ATRP of methyl methacrylate0 aNovel tridentate nitrogen donor as ligand in copper catalyzed AT a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcNOV a4996-50080 v433 a

A tridentate ligand, BPIEP: 2,6-bis[1-(2,6-diisopropyl phenylimino) ethyl] pyridine, having central pyridine unit and two peripheral imine coordination sites was effectively employed in controlled/''living'' radical polymerization of MXU at 90 degrees C in toluene as solvent, (CuBr)-Br-I as catalyst, and ethyl-2-bromoisobutyrate (EBiB) as initiator resulting in well-defined polymers with polydispersities M-W/M-n <= 1.23. The rate of polymerization follows first-order kinetics, k(app) = 3.4 x 10(-5) s(-1), indicating the presence of low radical concentration ([P*] <= 10(-8)) throughout the reaction. The polymerization rate attains a maximum at a ligand-to-metal ratio of 2:1 in toluene at 90 degrees C. The solvent concentration (v/v, with respect to monomer) has a significant effect on the polymerization kinetics. The polymerization is faster in polar solvents like, diphenylether, and anisole, as compared to toluene. Increasing the monomer concentration in toluene resulted in a better control of polymerization. The molecular weights (M-n,M-SEC) increased linearly with conversion and were found to be higher than predicted molecular (M-n,M-Cal). However, the polydispersity remained narrow, i.e., <= 1.23. The initiator efficiency at lower monomer concentration approaches a value of 0.7 in 110 min as compared to 0.5 in 330 min at higher monomer concentration. The aging of the copper salt complexed. with BPIEP had a beneficial effect and resulted in polymers with narrow polydispersitities and higher conversion. PMMA obtained at room temperature in toluene (33%, v/v) gave PDI of 1.22 (Mn = 8500) in 48 h whereas, at 50 degrees C the PDI is 1.18 (Ma = 10,300), which is achieved in 23 h. The plot of In kapp versus 1/T gave an apparent activation energy of polymerization as (Delta E-app(not equal)) 58.29 KJ/mol and enthalpy of equilibrium (Delta H-eq(0)) to 28.8 KJ/mol. Reverse ATRP of MMA was successfully performed using AIBN in bulk as well as solution. The controlled nature of the polymerization reaction was established through kinetic studies and chain extension experiments. (c) 2005 Wiley Periodicals, Inc.

10a210a6-bis [1-(210a6-diisopropyl phenylimino) ethyl] pyridine (BPIEP)10aActivation energy10aapparent rate constant10aAtom transfer radical polymerization (ATRP)10adiphenylether10aethyl-2-bromoisobutyrate (EBiB)10amethyl methacrylate10apolydispersity index (PDI)10aToluene1 aMittal, A.1 aSivaram, S. uhttps://library.ncl.res.in/content/novel-tridentate-nitrogen-donor-ligand-copper-catalyzed-atrp-methyl-methacrylate-101470nas a2200229 4500008004100000022001400041245009800055210006900153260007700222300001400299490000700313520062400320653004800944653001400992653000901006653001601015653001401031100002301045700002301068700002301091856012601114 2008 eng d a1022-133600aHydrated clay for catalyst removal in copper mediated atom transfer radical polymerization(a)0 aHydrated clay for catalyst removal in copper mediated atom trans aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcSEP a1538-15430 v293 a

A simple method has been described to remove catalyst from the copper mediated atom transfer radical polymerization (ATRP) of benzyl methacrylate and methyl methacrylate in anisole at 25 degrees C using hydrated natural clay (sodium montmorillonite, Na-clay). The method consists of (1) addition of hydrated clay (CU(I/)clay approximate to 5 wt.-%) either during or after the polymerization, (2) oxidation of catalyst complex by exposing the terminated reaction mixture in air, and (3) filtration to obtain catalyst free polymer solution. A strong coordination of CuBr-ligand complex onto hydrated clay (10 wt.-%

10aAtom transfer radical polymerization (ATRP)10aCatalysts10aclay10aselectivity10asynthesis1 aMunirasu, Selvaraj1 aDeshpande, Ashwini1 aBaskaran, Durairaj uhttps://library.ncl.res.in/content/hydrated-clay-catalyst-removal-copper-mediated-atom-transfer-radical-polymerizationa-002099nas a2200217 4500008004100000022001400041245009400055210006900149260007300218300001200291490000700303520124600310653004801556653002101604653002401625653003001649100003001679700002201709700002801731856012201759 2010 eng d a1381-514800aNew ATRP initiator for synthesis of cyclic carbonate-terminated poly(methyl methacrylate)0 aNew ATRP initiator for synthesis of cyclic carbonateterminated p aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a931-9370 v703 a

A new ATRP initiator, viz, 2-oxo-1,3-dioxolan-4-yl-(methyl-2-bromo-2-methylpropanoate) (ODMBMP) was synthesized by the reaction of commercially available glycerol carbonate with 2-bromoisobutyrylbromide and was used to carry out ATRP reactions of methyl methacrylate (MMA) in the presence of copper chloride/N,N',N',N''N''-pentamethyldiethylenetriamine to afford low molecular weight (M(n)(GPC) = 1750-7550) cyclic carbonate-terminated poly(methyl methacrylate)s with relatively narrow molecular weight distribution (M(w)/M(n) = 1.16-1.30). Poly(methyl methacrylate)s having higher molecular weight (M(n)(GPC) = 18,250 and 44,130) could also be synthesized using ODMBMP as the ATRP initiator. The kinetic studies of bulk ATRP of MMA showed a linear relationships between both In[M](o)/[M(t)] vs time and molecular weight vs conversion indicating controlled/living polymerization. The presence of cyclic carbonate functionality in poly(methyl methacrylate)s was confirmed by FUR. (1)H NMR, and (13)C NMR spectroscopy. The reactivity of cyclic carbonate group was demonstrated by a model reaction using n-propyl amine and the results showed quantitative conversion to hydroxyl urethane group. (C) 2010 Elsevier Ltd. All rights reserved.

10aAtom transfer radical polymerization (ATRP)10acyclic carbonate10afunctional polymers10apoly(methyl methacrylate)1 aPalaskar, Dnyaneshwar, V.1 aSane, Prakash, S.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/new-atrp-initiator-synthesis-cyclic-carbonate-terminated-polymethyl-methacrylate-002104nas a2200229 4500008004100000022001400041245012900055210006900184260010600253300001400359490000700373520114500380653003601525653004801561653001801609653003101627653001601658100002201674700003001696700002801726856012001754 2011 eng d a0014-305700aSynthesis of bis-allyloxy functionalized polystyrene and poly (methyl methacrylate) macromonomers using a new ATRP initiator0 aSynthesis of bisallyloxy functionalized polystyrene and poly met aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAUG a1621-16290 v473 a

A new bis-allyloxy functionalized ATRP initiator, viz, 4,4-bis (4-(allyloxy) phenyl) penty1-2-bromo-2-methylpropanoate was synthesized starting from commercially available 4,4-bis (4-hydroxyphenyl) pentanoic acid. Atom transfer radical polymerization of styrene in bulk and that of methyl methacrylate in anisole using CuBr/N,N,N',N',N `'-pentamethyldiethyl-enetriamine system was carried out. The kinetic study of styrene polymerization showed controlled polymerization behavior. Bis-allyloxy functionalized well-defined polystyrene (M(n)(GPC): 13,600-28,250, PDI: 1.07-1.09) and poly (methyl methacrylate) (M(n)(GPC): 10,100-18,450, PDI: 1.23-1.34) macromonomers were obtained. The presence of allyloxy functionality was confirmed by (1)H NMR spectroscopy. The reactivity of allyloxy functionality was demonstrated by carrying out organic reactions such as addition of bromine and hydrosilylation on polystyrene macromonomer. Polystyrene macromonomer with bis-allyloxy functionality was transformed into bis-epoxy functionalized polystyrene macromonomer using 3-chloroperoxybenzoic acid. (C) 2011 Elsevier Ltd. All rights reserved.

10aAllyloxy end-functional polymer10aAtom transfer radical polymerization (ATRP)10aMacromonomers10aPoly (methyl methacrylate)10aPolystyrene1 aSane, Prakash, S.1 aPalaskar, Dnyaneshwar, V.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/synthesis-bis-allyloxy-functionalized-polystyrene-and-poly-methyl-methacrylate-002595nas a2200241 4500008004100000022001400041245016600055210006900221260000900290300001200299490000700311520166800318653004801986653002702034653003802061653002102099653001602120100001902136700002802155700002102183700002602204856012302230 2019 eng d a0887-624X00aNew approach for the synthesis of miktoarm star polymers through a combination of thiol-epoxy ``click'' chemistry and ATRP/Ring-opening polymerization techniques0 aNew approach for the synthesis of miktoarm star polymers through cJAN  a146-1560 v573 a

A new approach was developed for synthesis of certain A(3)B(3)-type of double hydrophilic or amphiphilic miktoarm star polymers using a combination of ``grafting onto'' and ``grafting from'' methods. To achieve the synthesis of desired miktoarm star polymers, acetyl protected poly(ethylene glycol) (PEG) thiols (M-n = 550 and 2000 g mol(-1)) were utilized to generate A(3)-type of homoarm star polymers through an in situ protective group removal and a subsequent thiol-epoxy ``click'' reaction with a tris-epoxide core viz. 1,1,1-tris(4-hydroxyphenyl)ethane triglycidyl ether. The secondary hydroxyl groups generated adjacent to the core upon the thiol-epoxy reaction were esterified with alpha-bromoisobutyryl bromide to install atom transfer radical polymerization (ATRP) initiating sites. ATRP of N-isopropylacrylamide (NIPAM) using the three-arm star PEG polymer fitted with ATRP initiating sites adjacent to the core afforded A(3)B(3)-type of double hydrophilic (PEG)(3)[poly(N-isopropylacrylamide)] (PNIPAM)(3) miktoarm star polymers. Furthermore, the generated hydroxyl groups were directly used as initiator for ring-opening polymerization of epsilon-caprolactone to prepare A(3)B(3)-type of amphiphilic (PEG)(3)[poly(epsilon-caprolactone)](3) miktoarm star polymers. The double hydrophilic (PEG)(3)(PNIPAM)(3) miktoarm star polymers showed lower critical solution temperature around 34 degrees C. The preliminary transmission electron microscopy analysis indicated formation of self-assembly of (PEG)(3)(PNIPAM)(3) miktoarm star polymer in aqueous solution. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 146-156

10aAtom transfer radical polymerization (ATRP)10amiktoarm star polymers10aring-opening polymerization (ROP)10athermoresponsive10athiol-epoxy1 aGadwal, Ikhlas1 aWadgaonkar, Prakash, P.1 aIchake, Amol, B.1 aMane, Shivshankar, R. uhttps://library.ncl.res.in/content/new-approach-synthesis-miktoarm-star-polymers-through-combination-thiol-epoxy-click