Method for Making Waterborne Polyurethane with a Reactive Functional Group and a Nanocomposite Made of the Same

摘要

Disclosed is a method for making waterborne polyurethane with a reactive functional group. The method includes the step of introducing a short-chain diol monomer with a reactive functional group into waterborne polyurethane polymer by pre-polymerization to provide a polyurethane pre-polymer with the reactive functional group connected to a side chain and the step of reacting the pre-polymer with hydrophilic diamine for chain extension and inter-crosslink to provide waterborne polyurethane with different crosslink degree. The short-chain diol monomer is expressed by structural formula (I) and the polyurethane pre-polymer with the reactive functional group connected to the side chain is expressed by structural formula (II) as follows:; A is azetidine-2,4-dione functional group ;  or malonamide-linked alkyl group ;  and B is nitrogen-linked di-hydroxy terminal group ;  or tertiary amine-linked di-hydroxy terminal group ;  R1 is diisocyanate, and R2 is a polyol backbone and wherein IG is a neutralized ionic group.