Abstract
AbstractThe possibility to functionalize poly(2‐methylpropene) (PIB) by direct synthesis with functions containing nitrogen derived from the group of pseudohalogens, is demonstrated. Polymerization by cationic polyaddition of 2‐methylpropene using a suitable cocatalyst, here hydrazoic acid HN3 or hydrocyanic acid HCN, in the presence of titanium tetrachloride is carried out in methylene dichloride. The highest functionalization efficiency (f = 0,7) is obtained for a mole ratio catalyst‐to‐cocatalyst close to one. Part of the macromolecules is found to contain twice as many tert‐butyl groups as internal unsaturations. This finding is explained by the occurrence of some dimerization of macromonomers, which are formed by a PIB backbone terminated by one disubstituted unsaturation.
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