Synthesis and properties of waterborne polyurethane dispersions with ions in the soft segments

A maleic anhydride modified castor oil (MCO) was used to prepare aqueous polyurethane dispersions (MCPUs) with ionic groups in the soft segments according to the prepolymer mixing process. The aliphatic polyether PU prepolymer was prepared with MCO and polyether glycol (Ng210) as polymeric glycol component. The prepolymer was dispersed under vigorous agitation by adding water and by chain extension with ethylene diamine. The effects of r(m) (the mass ratio of MCO and Ng210) on the properties of the resultant waterborne polyurethanes (MCPUs) were studied. Structures and properties of the MCPU dispersions and their films were examined by FT-IR, particle size analyzer, DTG, DSC, WAXD, SEM and tensile tester. The MCPUs exhibit higher phase mixing with increasing of r(m).