02716nas a2200253 4500008004100000022001400041245012000055210006900175260006800244300001400312490000700326520180900333653001302142653002802155653002502183653001002208653001902218653001802237653001902255100001702274700002802291700001602319856012702335 2005 eng d a0887-624X00aStructure of poly(L-lactic acid)s prepared by the dehydropolycondensation of L-lactic acid with organotin catalysts0 aStructure of polyLlactic acids prepared by the dehydropolyconden a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY a2164-21770 v433 a

The synthesis of low-molecular-weight (weight-average molecular weight < 45,000 g/mol) lactic acid polymers through the dehydropolycondensation of L-lactic acid was investigated. Polymerizations were carried out in solution with solvents (xylene, mesitylene, and decalin), without a solvent using different Lewis acid catalysts (tetraphenyl tin and tetra-n-butyldichlorodistannoxane), and at three different polymerization temperatures (143, 165, and 190 degrees C). The products were characterized with differential scanning calorimetry, size exclusion chromatography, vapor pressure osmometry, C-13 NMR, and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF). The resulting polymers contained less than 1 mol % lactide, as shown by NMR. The number-average molecular weights were calculated from the ratio of the area peaks of ester carbonyl and carboxylic acid end groups via C-13 NMR. The stereosequences were analyzed by C-13 NMR spectroscopy on the basis of triad effects. Tetraphenyl tin was an effective transesterification catalyst, and the randomization of the stereosequence at 190 degrees C was observed. In contrast, the distannoxane catalyst caused comparatively less transesterification reaction, and the randomization of the stereosequences was slow even at 190 degrees C. The L-lactic acid and D-lactic acid isomers were added to the polymer chain in a small, blocky fashion. The MALDI-TOF spectra of poly(L-lactic acid) (PLA) chains doped with Na+ and K+ cations showed that the PLA chains had the expected end groups. The MALDI-TOF analysis also enabled the simultaneous detection of the cyclic oligomers of PLA present in these samples, and this led to the full structural characterization of the molecular species in PIA. (c) 2005 Wiley Periodicals, Inc.

10aC-13 NMR10adehydropolycondensation10aLewis acid catalysts10aMALDI10apolymerization10arandomization10astereosequence1 aShyamroy, S.1 aGarnaik, Baijayantimala1 aSivaram, S. uhttps://library.ncl.res.in/content/structure-polyl-lactic-acids-prepared-dehydropolycondensation-l-lactic-acid-organotin-001540nas a2200157 4500008004100000245018200041210006900223260000800292300002400300520083000324100002401154700002101178700002401199700002801223856013101251 2010 eng d00aSynthesis and characterization of novel value added biodegradable poly(aleuritic acid) from renewable resources(shellac) and invertible amphiphilic behaviors in various solvents0 aSynthesis and characterization of novel value added biodegradabl cNOV aArticle Number: 1313 a

A novel biodegradable polymer poly(aleuritic acid) (PAA) ( M̄w 120,000) was prepared from aleuritic acid, which was obtained from renewable resources (Lac) by using tin catalyst. Aleuritic acid (AL) was protected at 9, 10 position by dimethoxy propane. The protected AL (Pro.AL) was further polymerized to obtain linear protected polyaleuritic acid (PAL) by dehydropolycondensation. Effects of various kinetic and thermodynamic parameters were studied. After polymerization, the deprotection of PAL was carried out. The synthesized PAL and PAA were characterized by using various techniques such as FT-IR, LC-MS, SEC, NMR (1H and 13C), 13C CP/MAS (Cross Polarization / Magic Angle Spinning) of solid PAA, DSC, SEM and TEM etc. The micelle and inverted micelle -structure in polar and nonpolar solvents are highlighted

1 aPandey, Asutosh, K.1 aNande, Smita, S.1 aSelukar, Balaji, S.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/synthesis-and-characterization-novel-value-added-biodegradable-polyaleuritic-acid-renewable00630nas a2200157 4500008004100000245010000041210006900141260000800210300001400218490000600232100002400238700002200262700002300284700002800307856013700335 2012 eng d00aSynthesis of linear polylactic acid –based urethanes using tin modified closite -30b catalyst0 aSynthesis of linear polylactic acid based urethanes using tin mo cJAN a161 - 1710 v31 aSelukar, Balaji, S.1 aParwe, Sharad, P.1 aMohite, Kavita, K.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/synthesis-linear-polylactic-acid-%E2%80%93based-urethanes-using-tin-modified-closite-30b-catalyst01217nas a2200145 4500008004100000022001800041245013300059210006900192260000800261490000600269520061800275100002400893700002800917856012600945 2013 eng d a 2231-278100aStudy of grafting of polylactic acid and its copolymer with 12-hydroxy stearic acid on the surface of MWCNT by 13CCP/MAS and AFM0 aStudy of grafting of polylactic acid and its copolymer with 12hy cJAN0 v33 a

The purpose of this study to study the structure property relationship of grafted material on MWCNT, the determination of NMR nuclei spin-lattice (T1) and spin-spin (T2) relaxation times suggest that the broaden signals are associated with diamagnetic species namely the nanotube attached polymer moieties. the AFM image of PLA oligomer grafted MWCNTs and topography patterns comprised of height from 0-250 nm and the side lengths ranging from 0.0 to 7.7 µm. Surface patches are formed randomly distributed employing that the presence of side chain hanged at 12-postion in the copolymer grafted on MWCNTs.

1 aPandey, Asutosh, K.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/study-grafting-polylactic-acid-and-its-copolymer-12-hydroxy-stearic-acid-surface-mwcnt02722nas a2200301 4500008004100000022001400041245012500055210006900180260008400249300001400333490000600347520162800353653002701981653004202008653001102050653001702061653002002078653000802098653002402106653001902130100002202149700002502171700002302196700002402219700002102243700002802264856012802292 2014 eng d a1178-201300aSynthesis of ciprofloxacin-conjugated poly(L-lactic acid) polymer for nanofiber fabrication and antibacterial evaluation0 aSynthesis of ciprofloxacinconjugated polyLlactic acid polymer fo aPO BOX 300-008, ALBANY, AUCKLAND 0752, NEW ZEALANDbDOVE MEDICAL PRESS LTDcMAR a1463-14770 v93 a

Ciprofloxacin was conjugated with polylactide (PLA) via the secondary amine group of the piperazine ring using PLA and 7-(4-(2-Chloroacetyl) piperazin-1-yl)-1-cyclopropyl-6-fluoro-1, 4-dihydro-4-oxoquinoline-3-carboxylic acid. Zinc prolinate, a biocompatible catalyst was synthesized, characterized, and used in ring opening polymerization of L-lactide. Five different kinds of OH-terminated poly(L-lactide) (two-, three-, four-, six-arm, star-shaped) homopolymers were synthesized by ring opening polymerization of L-lactide in the presence of dodecanol, glycerol, pentaerythritol, dipentaerythritol as initiator and zinc prolinate as a catalyst. The structures of the polymers and conjugates were thoroughly characterized by means of gel permeation chromatography, matrix-assisted laser desorption/ionization-time of flight mass spectrometry, and nuclear magnetic resonance spectroscopy. PLA (molecular weight = 100,000) and ciprofloxacin conjugated PLA were used for fabrication of nonwoven nanofiber mat (diameter ranges; 150-400 nm) having pore size (62-102 nm) using electrospinning. The microbiological assessment shows that the release of ciprofloxacin possesses antimicrobial activity. The drug-release behavior of the mat was studied to reveal potential application as a drug delivery system. The result shows that the ciprofloxacin release rates of the PLA conjugate nonwoven nanofiber mat could be controlled by the drug loading content and the release medium. The development of a biodegradable ciprofloxacin system, based on nonwoven nanofiber mat, should be of great interest in drug delivery systems.

10aantibacterial activity10aciprofloxacin conjugated polylactides10aCP-PLA10adrug release10aelectrospinning10aMDR10anonwoven nanofibers10azinc prolinate1 aParwe, Sharad, P.1 aChaudhari, Priti, N.1 aMohite, Kavita, K.1 aSelukar, Balaji, S.1 aNande, Smita, S.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/synthesis-ciprofloxacin-conjugated-polyl-lactic-acid-polymer-nanofiber-fabrication-and-001460nas a2200217 4500008004100000022001400041245009900055210006900154260000900223300001200232490000700244520071700251653001800968653002800986653001301014653000901027653002801036100002301064700002801087856012701115 2020 eng d a1023-666X00aSynthesis and characterization of biocompatible poly (L-lactide) using zinc (II) salen complex0 aSynthesis and characterization of biocompatible poly Llactide us cJUL  a283-2990 v253 a

A biocompatible zinc (II) complex based on a tetradentate N,N,O,O-type salen ligand was synthesized, characterized and used for the solvent-free ring-opening polymerization (ROP) of L-lactide in bulk at 180 degrees C to prepare high molecular weight poly(L-lactide) (M-n: 82,600 Da;M-w: 140,000 Da; PDI: 1.70). Poly(L-lactide) (PLLA) was characterized using FTIR,H-1 NMR,C-13 NMR, GPC, TGA, DSC, WAXD, and MALDI-ToF. Kinetic measurement was carried out and first-order behavior to monomer was observed. Thek(app)was found as 6 +/- 0.001 x 10(-4 )s(-1). The biocompatibility of the PLLA was confirmed byin vitrocytotoxicity against NIH/3T3 fibroblast cell line and can be used in biomedical applications.

10aBiocompatible10aBiomedical Applications10ain vitro10aPLLA10azinc (II) salen complex1 aRade, Priyanka, P.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/synthesis-and-characterization-biocompatible-poly-l-lactide-using-zinc-ii-salen-complex03398nas a2200145 4500008004100000245009300041210007100134260000800205300001400213490000600227520284300233100002103076700002803097856012703125 2025 eng d00aSynthesis of amine-loaded styrene–divinylbenzene copolymers for carbon dioxide capture0 aSynthesis of amineloaded styrene–divinylbenzene copolymers for c cNOV a126–1410 v63 a

Carbon dioxide capture by various tertiary amines and quaternary bulky ammonium salts loaded in cross-link hybrid polymer (styrene–divinylbenzene copolymer) was explored. These polymeric materials were prepared by suspension polymerization in one pot using monomers like styrene and divinylbenzene in the presence of various amines to obtain uniform spherical beads. The homopolymer was separated from the cross-link hybrid product by Soxhlet extraction. The synthetic strategy is cost-effective and user-friendly, can be easily scaled up for production, and confirms better mechanical strength. The amine-loaded microporous polymeric spheres displayed a microsphere size of 5.2 nm with a high surface area of ∼25–310 m2 g–1. These hydrophobic polymeric spherical beads were thermally stable up to 200 °C. The quaternary ammonium group salt (bulky)-loaded beads presented high carbon dioxide uptake (up to ∼16.4 wt % at 273 K /1.0 bar) due to the presence of lone pair electrons of the heteroatom, which might improve the interaction between the polymeric matrices and CO2 molecules through local-dipole/quadruple interactions. In the case of tertiary amines, a high uptake of carbon dioxide (up to ∼15.2 wt % at 273 K /1.0 bar) was achieved, which is attributed to the formation of bicarbonate, as there may be the possibility of the presence of little moisture in the system, which facilitates the interaction. These hybrid polymeric materials exhibited a better storage capacity of CO2.

1 aNande, Smita, S.1 aGarnaik, Baijayantimala uhttps://library.ncl.res.in/content/synthesis-amine-loaded-styrene%E2%80%93divinylbenzene-copolymers-carbon-dioxide-capture