Journal
MACROMOLECULES
Volume 43, Issue 21, Pages 8880-8886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma101784y
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Funding
- National Science Foundation [CHE 05-43133]
- Robert A. Welch Foundation [A-0923]
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Polylactide and polycaprolactone were synthesized utilizing biocompatible zinc complexes as initiators at ambient temperature in controlled/living polymerization processes. The zinc complex containing a Schiff base ligand derived from the natural amino acid phenylalanine was found to catalyze the ring-opening polymerization of L-lactide and E-caprolactone in the melt at 110 degrees C to afford a series of random copolymers. These copolymers were shown to possess monomer contents which correlated well with their composition in the monomer feed. The thermal properties of the various copolymers (T-g, T-c, and T-m) as determined by differential scanning calorimetry were found to depend strongly on the copolymers' composition. For example, the T(g)s were shown to vary linearly with the molar % lactide in the copolymer over a temperature range of -67 to 60 degrees C.
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