Isobutene homo- and isobutene-isoprene copolymerization initiated by protic initiators associated with a series of novel, weakly coordinating counteranions
作者： KW Calvin , Anca Penciu , Paula J McInenly , Kainthan R Kumar , Mark J Drewitt
DOI: 10.1016/J.EURPOLYMJ.2004.07.019
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摘要: Abstract The highly electrophilic borane B(C6F5)3 reacts with a variety of carboxylic acids RCO2H to form 1:1 and 1:2 adducts [RCO2H][B(C6F5)3] [RCO2H][B(C6F5)3]2. These exhibit enhanced acidities, the adduct n-decanoic (stearic) acid in particular is an excellent initiator for carbocationic polymerization isobutene copolymerization isoprene methylene chloride methyl chloride. High conversions high molecular weight polyisobutene isobutene-isoprene copolymers are obtained at unusually temperatures, consistent anion [n-C17H35CO2{BC6F5)3}2]− being very weakly coordinating. Interestingly, system also exhibits surprising, as yet not understood, dependence polymer weights on nature R
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