Citation: . A NOVEL TITANIUM COMPLEX WITH LINKED β-DIKETONATO-INDENYL LIGAND FOR CATALYTIC SYNDIOSPECIFIC POLYMERIZATION OF STYRENE*[J]. Chinese Journal of Polymer Science, ;2002, 20(3): 213-217. shu

A NOVEL TITANIUM COMPLEX WITH LINKED β-DIKETONATO-INDENYL LIGAND FOR CATALYTIC SYNDIOSPECIFIC POLYMERIZATION OF STYRENE*

Received Date: 7 June 2001
Revised Date: 9 July 2001

A novel ligand (3), in which the indenyl group is linked to a β-diketone moiety through a three-carbon bridge, andits titanium complex (4) were synthesized. The titanium complex was employed as a metallocene analog with co-catalystmethylaluminoxane (MAO) in catalytic syndiospecific polymerization of styrene to give highly syndiotactic polystyrene(s-PS, 96%-97%). Polymerization temperature (Tp) strongly influenced the catalytic activity and syndiotacticity of theproduced PS. The activities of catalyst 4 increase from 1.84×106 to 3.26 ×106 gPS/molTi ·h with the increase of Tg from 60℃ to 80℃ and the syndiotacticities of the produced s-PS also increase slightly.Then,both the catalytic activity and the syndiotacticity of PS decrease at Tp of 90℃.
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