DIELECTRIC EAP FILMS WITH LOW GLASS TRANSITION TEMPERATURE BASED ON POLYESTER POLYOLS

摘要

The present invention relates to a method for producing a dielectric polyurethane film from a mixture comprising A) a compound containing isocyanate groups having a content of isocyanate groups of ≥ 10 and ≤ 50 wt.% and a number-average functionality of isocyanate groups of ≥ 2.6 and ≤ 4 and B) a polyester polyol having an OH-number of ≥ 27 and ≤ 120 mg KOH/g, determined in accordance with DIN 53240, characterized in that it exhibits an ester group content of ≥ 1 and ≤ 7 mol/kg and a portion of aromatic structures of ≤ 50 wt.-% The invention also relates to the dielectric polyurethane film obtainable by this method. The invention further relates to a method for preparing an electrochemical transducer and an electrochemical transducer obtainable by said method.