STEREOCHEMICAL CONTROL IN THE ANIONIC-POLYMERIZATION OF BETA-BUTYROLACTONE INITIATED WITH ALKALI-METAL ALKOXIDES

Authors
JEDLINSKI Z KOWALCZUK M KURCOK P ADAMUS G MATUSZOWICZ A SIKORSKA W GROSS RA XU J LENZ RW
Citation
Z. Jedlinski et al., STEREOCHEMICAL CONTROL IN THE ANIONIC-POLYMERIZATION OF BETA-BUTYROLACTONE INITIATED WITH ALKALI-METAL ALKOXIDES, Macromolecules, 29(11), 1996, pp. 3773-3777
Citations number
36
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecules → ACNP
ISSN journal
00249297
Volume
29
Issue
11
Year of publication
1996
Pages
3773 - 3777
Database
ISI
SICI code
0024-9297(1996)29:11<3773:SCITAO>2.0.ZU;2-S
Abstract
The anionic polymerization of (R)-beta-butyrolactone initiated with ei ther 18-crown-6 complexes of a potassium alkoxide or a simple carboxyl ate (reference initiator) proceeded with inversion of configuration. A s a result (R)-beta-butyrolactone formed an isotactic poly((S)-beta-hy droxybutyrate) with these initiators at room temperature. Polymerizati on of (R,S)-beta-butyrolactone under the same conditions gave an atact ic polymer, but at lower temperatures the predominantly syndiotactic f orm of poly((R,S)-beta-hydroxybutyrate) was produced from the racemic monomer.