Abstract
AbstractA series of anionomeric polyurethane‐ureas containing perfluoropolyether (PFPE) segments was obtained with a process consisting of a prepolymerisation step, followed by dispersion in water and chain extension. The anionomeric prepolymer can be dispersed in water according to the “prepolymer mixing method” (prepolymer added to water under stirring, or viceversa), then the diamine chain extender is added to form urea linkages. Some compositive parameters (amount of COOH groups in the polymer, diamine content) were optimised in order to obtain fine (diameter 60‐90 nm), stable and narrow distribution polymer particles even with a limited amount of ionomer content (COOH = 0.20‐0.25 eq/Kg). The fluid dynamics and process engineering of the dispersion step were finally discussed, defining optimal mixing conditions for obtaining controlled and highly reproducible results.
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