Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 39, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201800004
Keywords
Boc-carbamates; coating properties; high molecular weights; isocyanate-free; polyureas
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Funding
- research programs of the Dutch Polymer Institute (DPI AX Eindhoven, the Netherlands) [759]
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t-Butyl-oxycarbonylated diamines (di-Boc-carbamates) are investigated as dicarbamate monomers for diamine/dicarbamate polymerizations. Polyureas (PUs) and polyurethanes (PURs) with high molecular weights are prepared from stoichiometric polymerizations of diamines or diols with N-N-di-t-butyl-oxycarbonyl isophorone diamine (DiBoc-IPDC) using KOt-Bu as a catalyst, while gelation is observed when an excess of DiBoc-IPDC is used with respect to the diamines or diols. Stable dispersions are obtained from PUs and PURs with 3,3'-diamino-N-methyldipropylamine (DMDPA) as internal dispersing agent. The corresponding PU-based coatings exhibit superior mechanical properties and solvent resistances compared to the polyurethane urea coatings synthesized from diols, DiBoc-IPDC, and DMDPA.
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