Abstract
A new efficient monofunctional initiator transfer (minifer) system, comprising 2-cyclohexyl-2-propanol, BCl 3 and 1-methyl-2-pyrrolidinone, has been investigated for the first time in CH 2Cl 2 diluent at −40°C for the living polymerization of isobutylene. The use of this new minifer system has led to the synthesis of low molecular weight, living (near-monodisperse), new α-cyclohexyl-ω(tert-chloro)polyisobutylenes. The structural analysis of these polymers by 13C n.m.r. spectroscopy confirmed the nature of the head and end groups to be a cyclohexyl and a tert-chloro, respectively. The living nature of these polymers has been demonstrated by kinetic investigations as well as by their low polydispersity ( M ̄ w M ̄ n = 1.18–1.43 ) values from g.p.c. studies.
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