S. Cohen, T.O. Sedgwick, et al.
MRS Proceedings 1983
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.
S. Cohen, T.O. Sedgwick, et al.
MRS Proceedings 1983
J. Tersoff
Applied Surface Science
Biancun Xie, Madhavan Swaminathan, et al.
EMC 2011
P.C. Pattnaik, D.M. Newns
Physical Review B