Synthesis and characterisation of UV-curable waterborne polyurethane acrylate possessing perfluorooctanoate side-chains

摘要

There have been a number of recently published studies, referenced here, describing the synthesis and characterisation of waterborne PUs containing fluoro-functional groupings. Such polymers have been shown to produce coatings exhibiting good water and oil resistance, thermal stability and inherently low surface free energy. There have, however, been few reports of the preparation of UV curing, waterborne fluorinated PUs derived via condensation polymerisation. In this article a three-stage process for the preparation of such polymer dispersions is described. Initially a PU prepolymer was prepared by the reaction of isophorone diisocyanate, poly(propylene glycol) and dimethylol propionic acid. A pre-synthesised perfluorooctanoate glycerol (formula shown) was added to the heated prepolymer to effect chain extension via condensation polymerisation.