Bas G. G. Lohmeijer, Russell C. Pratt, et al.
Macromolecules
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.
Bas G. G. Lohmeijer, Russell C. Pratt, et al.
Macromolecules
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JACS
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Russell C. Pratt, Fredrik Nederberg, et al.
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