Catalytic Chain Transfer
Mediated Autopolymerization
of Divinylbenzene: Toward Facile Synthesis of High Alkene Functional
Group Density Hyperbranched Materials
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Abstract
A facile and highly reproducible autopolymerization method,
mediated
by catalytic chain transfer, for the synthesis of hyperbranched materials
with high alkene functional group density is reported. The rapid autopolymerization
of divinylbenzene at 150 °C in the absence of any catalytic chain
transfer agent was demonstrated to result in the formation of highly
cross-linked networks/gels in less than 10 min. Exploitation of the
extremely high chain transfer coefficient of bis[(difluoroboryl)diphenylglyoximato]cobalt(II)
delayed gelation and produced good yields of high molecular weight
hyperbranched divinylbenzene in under 1 h on a multigram scale. Gas
chromatography was employed to monitor the levels of conversion over
the course of the reaction. The materials produced were characterized
by GPC, MALLS, and viscometry