Well defined block copolymers of e-caprolactone and L-lactide using Y5(u-O)(OiPR)13a as an iniator

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Diblock copolymers composed of poly(ε-caprolactone) and poly(L-lactide) were synthesized via sequential living ring-opening polymerization of ε-caprolactone and L-lactide in dichloromethane initiated by Y5(µ-O)(OiPr)13 (yttrium isopropoxide). A series of diblock copolymers was synthesized with -caprolactone blocks of constant length (DP = 70) and lactide blocks of varying length (DP = 5-80), with polydispersities of 1,18-1,27. Molecular weights were close to theoretical values. 13C NMR spectroscopy shows the absence of transesterification reactions and racemization. The thermal properties of the block copolymers were studied using differential scanning calorimetry. The block copolymers show a certain degree of phase mixing depending on the length of the poly(L-lactide) blocks. Crystallization of L-lactide sequences did not occur when the block length consisted of less than 40 L-lactic acid residues
Original languageUndefined
Pages (from-to)1153-1161
JournalMacromolecular chemistry and physics
Issue number196
Publication statusPublished - 1995


  • METIS-105353
  • IR-71208

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