Studies on Syndiospecific Polymerization of Styrene Catalyzed by CpTiCl2(OR)/MAO System

Abstract

Abstract: Five new alkoxyl substituted half sandwich complexes CpTiCl₂(OR), R=methoxylethyl(1), methoxylpropyl(2), methoxylisopropyl(3), o methoxylphenyl(4), tetrahydrofurfuryl(5), were synthesized, characterized and tested as catalyst precursors for the syndiospecific polymerization of styrene. When activated with methylaluminoxane(MAO), the new precursors 1-5 exhibited high catalytic activity for the syndiospecific polymerization of styrene and were more active than CpTiCl₃. The differentstructures of alkoxyl ligands affected the activity slightly. When the polymerization was carried in bulk, all the five precursors exhibited high catalytic activity even at low ratio of c (Al)/ c (Ti)=300, the s PS% of the polymer produced by alkoxyl substituted complexes was much higher than that of CpTiCl₃. The polymerization temperature of 70 ℃ was more suitable for this kind of complexes. The existence of the additional oxygen atom in the alkoxyl ligands stabilized the active species at the higher temperature.

Key words: Met allocene catalyst, Styrene, Syndiospecific polymerization, Titanium

CLC Number:

O632

TrendMD:

MA Hai-Yan, ZHANG Yue, CHEN Bin, HUANG Ji-Ling, QIAN Yan-Long  . Studies on Syndiospecific Polymerization of Styrene Catalyzed by CpTiCl₂(OR)/MAO System[J]. Chem. J. Chinese Universities, 2001, 22(7): 1259.

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Studies on Syndiospecific Polymerization of Styrene Catalyzed by CpTiCl₂(OR)/MAO System

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