Joy Y. Cheng, Daniel P. Sanders, et al.
SPIE Advanced Lithography 2008
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.
Joy Y. Cheng, Daniel P. Sanders, et al.
SPIE Advanced Lithography 2008
Dipanjan Gope, Albert E. Ruehli, et al.
IEEE T-MTT
L.K. Wang, A. Acovic, et al.
MRS Spring Meeting 1993
A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics