Organosolubility and optical transparency of novel polyimides derived from 2′,7′-bis(4-aminophenoxy)-spiro(fluorene-9,9′-xanthene)

A series of polyimides were synthesized via a polycondensation of 2′,7′-bis(4-aminophenoxy)-spiro(fluorene-9,9′-xanthene) with aromatic tetracarboxylic dianhydrides. They exhibited a low dielectric constant, low moisture absorption, excellent solubility, high glass transition temperatures and high optical transparency.