Microstructure of highly syndiotactic "living" poly(propylene)s produced from a titanium complex with chelating fluorine-containing phenoxyimine ligands (an FI catalyst)

Authors
Saito, J Mitani, M Onda, M Mohri, JI Ishi, JI Yoshida, Y Nakano, T Tanaka, H Matsugi, T Kojoh, SI Kashiwa, N Fujita, T
Citation
J. Saito et al., Microstructure of highly syndiotactic "living" poly(propylene)s produced from a titanium complex with chelating fluorine-containing phenoxyimine ligands (an FI catalyst), MACRO RAPID, 22(13), 2001, pp. 1072-1075
Citations number
45
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR RAPID COMMUNICATIONS
ISSN journal
10221336 → ACNP
Volume
22
Issue
13
Year of publication
2001
Pages
1072 - 1075
Database
ISI
SICI code
1022-1336(20010918)22:13<1072:MOHS"P>2.0.ZU;2-W
Abstract
Highly syndiotactic "living" poly(propylene)s were synthesized at 25 degree sC using a bis[N-(3-tertbutylsalicylidene)-2,3,4,5,6-pentafluoroanilinato)t itanium (IV) dichloride/MAO catalyst system, axed microstructures of the po lymer were analyzed by means of C-13 NMR spectroscopy: The syndiotactic pol y(propylene) contains isobutyl, isopentyl and propyl end groups, suggesting that the living polymerization of propylene was initiated via 1,2-insertio n, followed by 2,1-insertion as the principal mode of polymerization. Penta d distribution analysis revealed that the syndiospecific polymerization pro ceeds under chain-end control.