Premium
Synthesis of MgCl 2 ‐supported dichlorobis(4,4,4‐trifluoro‐1‐phenyl‐1,3‐butanedionato)titanium catalysts with different titanium contents and their application to propene polymerization
Author(s) -
Kaji Eiichi,
Uozumi Toshiya,
Jin Jizhu,
Sano Tsuneji,
Soga Kazuo
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980801)199:8<1495::aid-macp1495>3.0.co;2-m
Subject(s) - propene , catalysis , polymerization , titanium , tacticity , polymer chemistry , selectivity , materials science , chemistry , polymer , organic chemistry
Various MgCl 2 ‐supported Ti(4,4,4‐trifluoro‐1‐phenyl‐1,3‐butanedionato) 2 Cl 2 catalysts with different Ti contents (0.017 ∼ 0.002 mmol/g) were synthesized and applied to propene polymerization using triethylaluminium and di‐ i ‐propyldimethoxysilane (DIPDMS) as the cocatalyst and external donor, respectively. When polymerization was conducted in the absence of DIPDMS, neither the activity nor the isospecificity of catalyst were dependent upon the Ti content. However, the effect of DIPDMS on the catalyst performance was found to be markedly dependent upon the Ti content, i.e., the addition of DIPDMS to the catalyst with low Ti content caused a prominent increase in the activity for isotactic polymerization. As a result, the present catalyst with low Ti content gave a highly isotactic polypropene with T m = 169.3°C and [ mmmm ] > 99% in high selectivity (I.I. = 97.7%).