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Microstructure of Highly Syndiotactic “Living” Poly(propylene)s Produced from a Titanium Complex with Chelating Fluorine‐Containing Phenoxyimine Ligands (an FI Catalyst)
Author(s) -
Saito Junji,
Mitani Makoto,
Onda Mitsuhiko,
Mohri JunIchi,
Ishii SeiIchi,
Yoshida Yasunori,
Nakano Takashi,
Tanaka Hidetsugu,
Matsugi Tomoaki,
Kojoh ShinIchi,
Kashiwa Norio,
Fujita Terunori
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20010901)22:13<1072::aid-marc1072>3.0.co;2-7
Subject(s) - tacticity , polymerization , polymer chemistry , catalysis , polymer , titanium , microstructure , materials science , living polymerization , chemistry , radical polymerization , organic chemistry , metallurgy , composite material
Highly syndiotactic “living” poly(propylene)s were synthesized at 25°C using a bis[ N ‐(3‐ tert ‐butylsalicylidene)‐2,3,4,5,6‐pentafluoroanilinato]titanium (IV) dichloride/MAO catalyst system, and microstructures of the polymer were analyzed by means of 13 C NMR spectroscopy. The syndiotactic poly(propylene) contains isobutyl, isopentyl and propyl end groups, suggesting that the living polymerization of propylene was initiated via 1,2‐insertion, followed by 2,1‐insertion as the principal mode of polymerization. Pentad distribution analysis revealed that the syndiospecific polymerization proceeds under chain‐end control.