Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 40, Issue 7, Pages 844-851Publisher
WILEY
DOI: 10.1002/pola.10168
Keywords
living polymerization; organic catalysts; lactide
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A new metal-free synthetic approach to the controlled ring-opening polymerization (ROP) of lactide with nucleophilic phosphines as transesterification catalysts is described. P(Bu)(3), PhPMe2, Ph2PMe, PPh3, and related phosphines are commercially available, inexpensive catalysts that generate narrowly dispersed polylactides with predictable molecular weights. These organic catalysts must be used in combination with an initiator, such as an alcohol, to generate an alcoholate ester alpha-end group upon ROP. A likely polymerization pathway is through a monomer-activated mechanism, with minimal active species, facilitating narrow molecular weight distributions. (C) 2002 Wiley Periodicals, Inc.
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