01937nas a2200229   4500008004100000022001400041245006000055210005700115260006800172300001400240490000800254520118200262653001801444653002301462653001301485653003301498653002301531100002101554700002101575700002401596856008701620       2009                        eng d  a0021-899500aReactive extrusion of poly(L-Lactic Acid) with glycidol0 aReactive extrusion of polyLLactic Acid with glycidol  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY  a1391-13980 v1123 a<p>Glycidol modified polylactic acid (PLLA) polymers have been prepared by reactive extrusion. Influences of residence time and the concentration of glycidol on the extent of reaction with different weight average molecular weight (45,000, 65,000, and 100,000) PLLA's were studied. Structure-property relationship has been established by measuring molecular, mesoscopic, and macroscopic properties. Under reactive extrusion conditions glycidol reacted with the end groups of PLLA to initiate chain extension. Low-molecular weight PLLA reacted with glycidol faster than the medium molecular weight PLLA, whereas high-molecular weight PLLA did not show significant reactions. The glass transition temperature, melting temperature, crystallization temperature, and heat of fusion were measured for unmodified and modified PLLA's. Chain extended PLLA had higher T(g) and T(m) than the unmodified samples. Time sweep rheological experiments were performed to test the melt stability of PLLA. Chain extended PLLA's were found to retain viscoelastic properties for much longer time than the unreacted samples. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 1391-1398, 2009</p>10abiodegradable10areactive extrusion10aRheology10astructure-property relations10aThermal properties1 aDeenadayalan, E.1 aLele, Ashish, K.1 aBalasubramanian, M.  uhttps://library.ncl.res.in/content/reactive-extrusion-polyl-lactic-acid-glycidol-0