Preparation of Tethered Half-Titanocene Complex on Syndiotactic Poly(styrene-<Emphasis Type="Italic">co</Emphasis>-<Emphasis Type="Italic">p</Emphasis>-methylstyrene) for Using in Syndiospecific Polymerization of Styrene |
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Authors: | Sohrab Rahmani A A Entezami |
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Affiliation: | (1) Laboratory of Polymer, Faculty of Chemistry, University of Tabriz, Tabriz, Iran |
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Abstract: | Abstract In this work the syndiotactic polystyrene copolymer, poly (styrene-co-p-methylstyrene) was prepared by the copolymerization of styrene and p-methylstyrene with cyclopentadienyltitanium trichloride/methylaluminoxane catalyst. This copolymer was functionalized with
silyl-hydride groups. The structure of copolymer and functionalized copolymer were characterized by FT-IR, 1H-NMR and 13C-NMR spectroscopy. The obtained results revealed that the functionalization reaction successfully proceeds at low temperatures.
Tethering of half-titanocene complex on polymeric support was done by the hydrosilylation reaction of 1-allylindenyltrichlorotitanium
with silyl-hydride functionalized copolymer in the presence of Karstedt catalyst as a coupling reagent. The polymer-supported
catalyst was tested for syndiospecific polymerization of styrene using methylaluminoxane as a cocatalyst. The results of styrene
polymerization showed that the polymer-supported catalyst exhibited high activity for syndiospecific polymerization of styrene.
The polymer prepared with supported catalyst was characterized by carbon nuclear magnetic resonance (13C-NMR) and differential scanning calorimetry (DSC). The results confirmed the syndiotacticity of obtained polymers. X-ray
diffraction (XRD) analysis showed the δ-form crystalline structure of obtained syndiotactic polystyrene. |
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