Synthesis, characterization, and Diels–Alder extension of cyclopentadiene telechelic polyisobutylene. III. Silylcyclopentadiene‐telechelic polyisobutylene

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Abstract
Telechelic polyisobutylenes with silylcyclopentadiene termini (CpSi‐PIB‐SiCp) were prepared, starting with α,ω‐di(t‐chloro)polyisobutylene and followed by dehydrochlorination, hydrosilylation, and cyclopentadienylation. The prepolymer was characterized and found to have a terminal functionality close to 2.0. Thermal chain extension by Diels–Alder addition of the end groups did not occur, most likely because of fluxional isomerization of the silylcyclopentadiene end groups, confirmed by model studies. Chain coupling of CpSi‐PIB‐SiCp prepolymers with stoichiometric amounts of bismaleimide gave rise to degrees of extension of more than 11.

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