Sung Ho Kim, Jeremy P. K. Tan, et al.
Biomaterials
Highly isotactic polylactide with a high melting temperature was synthesized from rac-lactide through an organocatalytic route using dimeric phosphazene base 1-tert-butyl-2,2,4,4,4-pentakis(dimethylamino)-2Λ5,4Λ5-catenadi(phosphazene) (P2-t-Bu) catalyst at low temperature. Microstructural analysis of the prepared polymer using homodecoupled 1H NMR spectroscopy revealed the formation of a stereoblock architecture containing long isotactic sequence of R and S blocks in the main chain. A proposed mechanism involving chain-end control and stereoerror explains the stereoselective polymerization. Copyright © 2007 American Chemical Society.
Sung Ho Kim, Jeremy P. K. Tan, et al.
Biomaterials
Christina B. Cooley, Brian M. Trantow, et al.
JACS
Sung Ho Kim, Fredrik Nederberg, et al.
Nano Letters
Lei Zhang, Fredrik Nederberg, et al.
Macromolecules