SYNTHESIS OF POLYAMIC ACIDS CONTAINING PE RFLUOROPROPYL GROUP

Polyamic acids containing a perfluoropropyl group were obtained by the reactions of pefluorobutyryl peroxide with the corresponding polyamic acids in 1,1,2-trichloro-1,2,2-trifluoroethane (Freon 113) under mild conditions. This aromatic perfluoropropylation in Freon 113 proceeded in good perfluoropropylated ratios by using trifluoroacetic acid or 1 ,1,1,3,3,3-hexafluoro-2-propanol as co-solvent; however, the molecular weights of the obtained perfluoropropylated polyamic acids were lower than those of parent polyamic acids.