Synthesis and Properties of Triblock and Multiblock Copolymers Consisting of Poly(L-lactide) and Poly(oxyethylene-co-oxypropylene)

  • Lee, Chan-Woo (Department of Innovative Industrial Technology, Hoseo University) ;
  • Kang, Young-Goo (Department of Innovative Industrial Technology, Hoseo University) ;
  • Kun Jun (Korea Research Institute of Chemical Technology)
  • Published : 2001.04.01


Both A-B-A triblock and multiblock copoly(ester-ether)s consisting of poly(L-Lactide) and poly(oxyethylene-co-oxypropylene) were prepared and characterized. The preparation of the triblock copolymer was done by ring-opening copolymerization of L-lactide with a commercially available telechelic copolyether, Pluronic$\^$TM/(PN) by catalysis of stannous octanoate. The molecular weight and unit composition of the produced copolymers were successfully controlled by changing the L-lactide/PN ratio in feed. However, a high molecular weight copolymer incorporating PN in large amount was not obtained because the molecular weight of the resulting copolymer was limited at a high L-lactide/PN composition. The multiblock copolymer was synthesized by the copolycondensation of oligo(L-lactic acid) prepared by thermal dehydration of L-lactic acid, PN, and dodecanedioic acid as carboxyl/hydroxyl adjusting agent. This polycondensation proceeded by catalysis of stannous oxide to give multiblock copolymers with high molecular weight and wide range of compositions.



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