Catalysts for isocyanate-free polyurea synthesis : mechanism and application

S. Ma, C. Liu, R.J. Sablong, B.A.J. Noordover, E.J.M. Hensen, R.A.T.M. van Benthem, C.E. Koning

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Abstract

Four catalysts, viz. 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), potassium bis(trimethylsilyl)amide (KHMDS), potassium methoxide (KOMe), and potassium tert-butoxide (KO-t-Bu), are screened for a low-toxicity route toward (poly)urethane/urea preparation from carbonate/carbamate esters. On the basis of similar kinetics, the catalytically active species for KHMDS, KO-t-Bu, and KOMe is inferred to be the alkoxide anion RO–, depending on the R group in the carbonate/carbamate. Its activity is much higher than that of TBD. Computational simulation for MeO–-catalyzed urethane/urea formation has been carried out using density functional theory. The activation energies calculated are in close match with the experimental results for the three MeO–-based catalysts. TBD and KOMe are applied in the isocyanate-free polyurea preparation by polycondensation. Again, KOMe shows a higher efficiency than TBD.
Original languageEnglish
Pages (from-to)6883–6891
Number of pages9
JournalACS Catalysis
Volume6
Issue number10
DOIs
Publication statusPublished - 9 Sep 2016

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