Abstract
Cationic polymerization of indene in methylene dichloride was effected by two stable carbonium ion salt initiators, tropylium hexachloroantimonate and xanthylium perchlorate, the former being more efficient. Very high conversions of monomer to polyindene were obtained with catalyst concentrations ∼10 −2 M. Molecular weights were approximately 10 000 and it is concluded that whilst initiation is fairly rapid and complete, active centres are lost by creation of more stable cationic species from polyindene chains. Mechanisms are proposed to account for the formation, during polymerization, of characteristically coloured species.
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