A. Gangulee, F.M. D'Heurle
Thin Solid Films
Alcohol adducts of the N-heterocyclic carbene, 1,3,4-triphenyl-4,5-dihydro-lff-l,2-triazol-5-ylidene (NHC), function as excellent single-component catalyst/initiators for the ring-opening polymerization of lactide and β-butyrolactone, Their reversible dissociation at elevated temperatures generates alcohol and triazolylidene carbene to provide a facile entry to polymerization of cyclic esters on demand. Under optimum conditions, adverse transesterification reactions are minimized, and importantly, upon complete consumption of monomer, a second monomer addition facilitates additional polymer growth, even after precipitation. Block copolymers were prepared by combining disparate polymerization techniques from the use of oligo-adducts and bifunctional initiators. Additionally, more complex polymer architectures were prepared from multifunctional or dendritic initiators, further demonstrating the versatility of the N-heterocyclic carbene platform. © 2006 American Chemical Society.
A. Gangulee, F.M. D'Heurle
Thin Solid Films
John G. Long, Peter C. Searson, et al.
JES
Kenneth R. Carter, Robert D. Miller, et al.
Macromolecules
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SPIE AeroSense 1997