FLAME-RESISTANCE OF POLYETHERIMIDES

Polyetherimides containing isopropylidene and hexafluoroisopropylidene groupings were obtained by the interaction of m-phenylenediamine with the dianhydrides of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]-propane a nd 2,2-bis[4-(3,4-dicarboxyphenoxy)-phenyl] hexafluoropropane using hi gh-temperature solution polycyclocondensation in phenolic solvents. Th e same procedure was used for the preparation of the isopropylidene- a nd and hexafluoroisopropylidene-containing polyetherimides on the basi s of 3,3',4,4'-tetracarboxy(diphenyl ether)dianhydride and 2-bis[4-(3- aminopheno-xy)phenyl]hexafluoropropane. Investigation of the polymers obtained has demonstrated that the replacement of isopropylidene group ings for hexafluoroisopropylidene fragments in polyetherimides leads t o the increasing of the polymers flame-resistance.