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Living Carbocationic Polymerization. VII. Living Polymerization of Isobutylene by Tertiary Alkyl (or Aryl) Methyl Ether/Boron Trichloride Complexes
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1987
Year
Macromolecular ChemistryEngineeringOrganic ChemistryChemistryPolymersChemical EngineeringMacromolecular EngineeringTertiary AlkylPolymer ProcessingPolymer ChemistryPib ChainsBiomolecular EngineeringCarbocationic PolymerizationLiving PolymerizationsPolymer ScienceCh2c12or Ch3c1Polymer CharacterizationPolymerization KineticsPolymer ReactionPolymer Synthesis
Abstract It has been discovered that the living polymerization of isobutylene (IB) can be induced by MeORt/BCl3 initiating systems in CH2C12or CH3C1 at −10 and −30°C. Diagnostic proof for the living polymerizations are 1) proportionality of M n to polyisobutylene (PIB) formed and 2) independence of number of PIB chains of amount of PIB formed. By the use of agedC(CH3)3CH2OMe/BCl3 and C6H5C(CH3)2OMe/BCl3 systems, initiation efficiency (leff) ≍ 100% and M n is determined by the [monomer]0/[initiator]0 ratio. Polymerizations quenched by methanol yielded f-chloro end groups.