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The attempted copolymerization of styrene and ethylene with monocyclopentadienyltitanium trichloride/methylaluminoxane catalyst. Effect of polymerization conditions

✍ Scribed by Päivi Aaltonen; Jukka Seppälä

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
441 KB
Volume
31
Category
Article
ISSN
0014-3057

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✦ Synopsis

The copolymerization of styrene and ethylene was attempted in the presence of the catalytic system CpTiCl,methylaluminoxane.

Polymerizations were carried out at different polymerization temperatures and Al/Ti mole ratios. The structure of the polymer was investigated with FTIR, DSC, GPC, and "C-NMR techniques. The polymerization product was composed of polyethylene and syndiotactic polystyrene. No ethylene-styrene copolymer was detected. The composition of the product was dependent on the polymerization conditions. The catalyst activity was highest at polymerization temperature 30°C and Al/Ti ratio 1500. Styrene concentration of the product was highest at polymerization temperature 50°C and AI/Ti ratio 1500. The melting temperature of the polyethylene fraction was dependent on the styrene content of the product, suggesting some interaction between the monomers in the polymerization reaction. The formation of separate polymer fractions may indicate a different polymerization mechanism

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