SYNTHESIS AND CHARACTERIZATION OF LOW-VISCOSITY FLUOROPOLYETHER-BASEDSEGMENTED OLIGOMERS

Six oligomeric polyols having a common perfluoropolyether chain end-ca pped by different hydrogenated segments containing hydroxylic groups w ere synthesized and their properties described. The general scheme for the synthesis of these polyols involved the etherification of the flu oropolyether diol precursor (ZDOL) with epoxides or dibromoalkanes. Th e former reaction gave directly the polyolic derivatives, while the la tter yielded the fluorinated dibromoderivative which could be converte d to polyols through the reaction with malonate and final reduction. T he viscosity of these oligomers was measured and its dependence on tem perature, solvent concentration and hydroxylic end-groups content was established. The exceptionally low T-g and viscosity together with the good miscibility with common solvents make these polyols very interes ting as ''resins'' suitable for high-solid coatings.