01787nas a2200133   4500008004100000022001400041245011500055210006900170260008900239300000800328520116200336100002401498856013101522       2010                        eng d  a1618-722900aCopolymerzation of L,L-lactide with epsilon-caprolactone by using novel zinc L-proline organometallic catalyst0 aCopolymerzation of LLlactide with epsiloncaprolactone by using n  a1, QUAI LEZAY-MARNESIA, F067000 STRASBOURG, FRANCEbEUROPEAN POLYMER FEDERATIONcDEC  a1393 a<p>Copolyesters based on L, L-lactide (LA) and e-caprolactone (CL) with different LA: epsilon-CL ratios were synthesized by ring opening polymerization using zinc (L-proline) as a catalyst. Ring opening polymerization results in random P(L, L-lactide-epsilon-caprolactone) copolymers of molecular weights between 9,800 to 30,000 and block copolymer up to 51,800 Da. H-1 NMR spectroscopy analysis was used for calculation of monomer incorporation in the copolymer. FT-IR spectra were used to differentiate between random and block copolymer using carbonyl region splitting. C-13 quantitative NMR spectroscopy analysis coupled with information from TGA and DSC allowed determination of the polymer structure. Copolymers (CP-1, CP-2 and CP-3) prepared by ROP are random copolymer (h &gt; 1), while CP-4 prepared by ROP (sequential addition of epsilon-caprolactone and L, L-lactide) has a multi block character (h &lt; 1). The LA number-average sequence length (L-LA) decreased from 14 to 5 for LA-CL 80:20 to 50:50 copolymers prepared by ROP. The copolymer (CP-4) prepared by sequential addition showed the number-average sequence length (L-LA) to be 83.0.</p>1 aPandey, Asutosh, K.  uhttps://library.ncl.res.in/content/copolymerzation-ll-lactide-epsilon-caprolactone-using-novel-zinc-l-proline-organometallic-001934nas a2200265   4500008004100000022001400041245015900055210006900214260005700283300001200340490000700352520097600359653001301335653001701348653001801365653001501383653002501398100001701423700002401440700002001464700001401484700002201498700001801520856013001538       2010                        eng d  a1598-503200aEnhancement of thermal stability and phase relaxation behavior of chitosan dissolved in aqueous l-lactic acid: using `silver nanoparticles' as nano filler0 aEnhancement of thermal stability and phase relaxation behavior o  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAUG  a713-7200 v183 a<p>Chitosan films with various compositions of silver nanoparticles were prepared by solution casting with an aqueous solution of chitosan and l-lactic acid. The chitosan/Ag nanocomposites were characterized by wide angle Xray diffraction (WAXD) and UV-vis spectroscopy. An analysis of the surface topography and size of the Ag nanoparticles (&lt;= 100 nm) were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. Thermogravimetric analysis (TGA/DTA) confirmed the increase in thermal stability with increasing Ag nanoparticle content in the nanocomposites. Dynamic thermal analysis (DMA) was used to examine the phase relaxation behavior of chitosan and its nanocomposites. The conductivity of chitosan/Ag nanocomposites was considered with respect to the frequency. Contact angle measurements were used to characterize the surface twistability, surface cleanliness, and hydrophilic/hydrophobic nature of the surface.</p>10aChitosan10aconductivity10acontact angle10arelaxation10asilver nanoparticles1 aRana, V., K.1 aPandey, Asutosh, K.1 aSingh, Raj, Pal1 aKumar, B.1 aMishra, Satyendra1 aHa, Chang-Sik  uhttps://library.ncl.res.in/content/enhancement-thermal-stability-and-phase-relaxation-behavior-chitosan-dissolved-aqueous-l-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<p>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</p>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-renewable01106nas a2200145   4500008004100000022001400041245011500055210006900170260000800239490000600247520052900253100002400782700002800806856012600834       2013                        eng d  a2231-278100aCopolymerization of aleuritic acid with l-lactic acid and study the aggregation behavior in different solvents0 aCopolymerization of aleuritic acid with llactic acid and study t  cJAN0 v33 a<p>In this present work, we highlight the copolymerization of L-lactic acid (L-LA with protected aleuritic acid in presence of Lewis acid catalyst using dehyropolycondensation method. The resulted copolymers are pliable, soft, waxy or even viscous liquid copolymers influenced by the aleuritic acid content. The purpose of this study is to investigate the physical properties. In addition, deprotected copolymers focus micelle-like aggregates in various organic solvents and mixed organic solvent at various proportions.</p>1 aPandey, Asutosh, K.1 aGarnaik, Baijayantimala  uhttps://library.ncl.res.in/content/copolymerization-aleuritic-acid-l-lactic-acid-and-study-aggregation-behavior-different01217nas 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<p>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.</p>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-mwcnt