02096nas a2200229   4500008004100000022001400041245020100055210006900256260006700325490000800392520112200400653001801522653001501540653003801555653002601593653003201619100002201651700002401673700002301697700002501720856012101745       2016                        eng d  a0021-899500aSynthesis and characterization of well-defined random and block copolymers of epsilon-caprolactone with l-lactide as an additive for toughening polylactide: Influence of the molecular architecture0 aSynthesis and characterization of welldefined random and block c  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcAPR0 v1333 a<p>Well-defined multiarmed star random and block copolymers of epsilon-caprolactone with l-lactide with controlled molecular weights, low polydispersities, and precise numbers of arms were synthesized by the ring-opening polymerization of respective cyclic ester monomers. The polymers were characterized by H-1-NMR and C-13-NMR to determine their chemical composition, molecular structure, degree of randomness, and proof of block copolymer formation. Gel permeation chromatography was used to establish the degree of branching. Star-branched random copolymers exhibited lower glass-transition temperatures (T-g's) compared to a linear random copolymer. When the star random copolymers were melt-blended with poly(l-lactic acid) (PLA), we observed that the elongation of the blend increased with the number of arms of the copolymer. Six-armed block copolymers, which exhibited higher T-g's, caused the maximum improvement in elongation. In all cases, improvements in the elongation were achieved with no loss of stiffness in the PLA blends. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43267.</p>10abiodegradable10acopolymers10adifferential scanning calorimetry10amechanical properties10aring-opening polymerization1 aDeokar, Megha, D.1 aIdage, Susheela, B.1 aIdage, Bhaskar, B.1 aSivaram, Swaminathan  uhttps://library.ncl.res.in/content/synthesis-and-characterization-well-defined-random-and-block-copolymers-epsilon-002390nas a2200169   4500008004100000022001400041245016500055210006900220260000800289300001400297490000600311520170100317100002202018700002802040700002502068856012702093       2022                        eng d  a2470-134300aToughening poly(l-lactide) blends: effectiveness of sequence-controlled six-arm star-branched block copolymers of poly(L-lactide) and poly(epsilon-caprolactone)0 aToughening polyllactide blends effectiveness of sequencecontroll  cMAR  a9118-91290 v73 a<p>
	Well-defined six-arm star-branched bio-degradable block copolymers of L-lactide and epsilon-caprolactone were prepared using controlled ring-opening polymerization and a sequential monomer addition method using dipentaerythritol as the initiator core and organocatalysts at low temperatures in solution. Sequence of enchainment was changed by reversing the order of monomer addition giving, either, a crystalline PLA block or an amorphous PCL block as the outer segment. Well-defined six-arm poly(epsilon-caprolactone-b-L-lactide, 6s-PCL-b-PLA) block copolymers were obtained with a range of segment molecular weights. However, in the case of six-arm poly(L-lactide-b-epsilon-caprolactone, 6s-PLA-b-PCL), disruption of the block structure was observed on account of competing transesterification reactions accompanying a chain-growth reaction. Such sequence-controlled block copolymers showed interesting phase morphologies, as evidenced by differential scanning calorimetry (DSC) studies. 6s-PCL-b-PLA showed two glass-transition temperatures and two melting temperatures characteristic of the amorphous and crystalline blocks. 6s-PCL-b-PLA and 6s-PLA-b-PCL with different segment chain lengths were solution blended (10 wt %) with a commercially sourced PLA. All the blends were highly transparent. The structure and properties of the blend were examined by DSC, measurement of mechanical properties, and scanning electron microscopy. The results show that a phase-separated 6s-PCL-b-PLA copolymer results in two- to three-fold improvement in tensile toughness without the loss of modulus. A possible hypothesis for the mechanism of tensile toughness in the blend has been proposed.</p>
1 aDeokar, Megha, D.1 aGarnaik, Baijayantimala1 aSivaram, Swaminathan  uhttps://library.ncl.res.in/content/toughening-polyl-lactide-blends-effectiveness-sequence-controlled-six-arm-star-branched