Title: STABILIZATION OF SYNDIOTACTIC POLYSTYRENE OBTAINED IN PRESENCE OF CpTiCl2(OC6H4Cl)/MAO CATALYST
Page Range: p.153-158
Author(s): Kowalska E; Skupinski W; Wozniewski T; Wielgosz Z; Borensztejn M
File size: 114K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2
Abstract
The stabilisation of syndiotactic polystyrene, obtained in the presence of the original cyclopentadienyl (p-chlorophenoxy) dichlorotitanium (IV)/methylaluminoxane catalytic system, was investigated. Use of this catalytic system, syndiotactic polystyrene melted in the temperature region of 250-260 degrees C, giving a wider temperature window for processing. Five types of commercial antioxidant and stabilisers were used, together with two specially synthesised stabilisers. These were used in amounts from 0.05 to 1.0 wt.%, and the stability of unstabilised and stabilised syndiotactic polystyrene in a moulding process was evaluated by measuring the melt flow rate in a plastometer, and after four extrusion passes. A second method for the evaluation of the stability of sPS was the measurement of the Index of Thermal Stability. Results of the trials are given. 14 refs.
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