Synthesis of vinyl-terminated isotactic poly(propylene)

Authors
Weng, WQ Markel, EJ Dekmezian, AH
Citation
Wq. Weng et al., Synthesis of vinyl-terminated isotactic poly(propylene), MACRO RAPID, 21(16), 2000, pp. 1103-1107
Citations number
21
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR RAPID COMMUNICATIONS
ISSN journal
10221336 → ACNP
Volume
21
Issue
16
Year of publication
2000
Pages
1103 - 1107
Database
ISI
SICI code
1022-1336(20001114)21:16<1103:SOVIP>2.0.ZU;2-G
Abstract
Isotactic poly(propylene)s with 60-85% vinyl chain-end selectivity were syn thesized with metallocene catalysts. Some of these vinyl-terminated poly(pr opylene)s are highly stereoregular (mmmm pentads up to 95%) and have high c rystalline melting points in the range of 140-150 degrees C. Chain-end anal ysis using C-13 NMR indicates the vinyl chain-ends in the polymer are most likely formed through beta -methyl elimination in the chain termination ste p.