Waterborne azido-alkyne click compositions

摘要

A waterborne alternative polyurethane composition is provided which comprises a reaction product of: an azidated polyol; and a waterborne poly(alkynyl carbamate) prepolymer comprising a reaction product of a polyisocyanate and from 1 wt. % to 20 wt. % of an alkynol-polyether having a formula (I),R1—R2—O—R3—OH  (I),wherein,R1=a monovalent group selected from either HC≡C— or HC≡C—CO—,R2=a divalent alkylene group from 1 to 8 carbon atoms, and may be straight chain or branched and may contain cyclic moieties, andR3=a polyethylene glycol with number average molecular weight from 300-1,200 g/mol, wherein the wt. % is based on the weight of the prepolymer, wherein reaction of the azidated polyol and the waterborne poly(alkynyl carbamate) occurs at a temperature of from 20° C. to 200° C. and optionally in the presence of a catalyst. The inclusion of an alkynol-polyether does not materially alter the performance properties and reactivity of the waterborne polyurethane composition relative to a solventborne polyurethane control composition. Inclusion of the alkynol-polyether reduces the need for organic solvents by allowing for the use of water as a carrier. The inventive waterborne alternative polyurethane compositions may find use in or as coatings, adhesives, sealants, films, elastomers, castings, foams, and composites.