Aromatic poly(ester imide)s and poly(amide imide)s having 1,1 '-binaphthyl-2,2 '-diyls in the main chain

Full Paper: Two new 1,1'-binaphthyl-2,2'-diyl-based dianhydrides, i.e., 2,2 '-bis(3,4-dicarboxybenzamido)-1,1'-binaphthyl dianhydride (BNDADA) and 2,2' -bis(3,4-dicarboxybenzoyloxy)-1,1'-binaphthyl dianhydride (BNDEDA), were sy nthesized and polymerized with various aromatic diamines to afford polyimid es through the traditional two-step method. The polyimides with inherent vi scosities ranging from 0.27 to 0.70 dl . g(-1) showed excellent solubilitie s in polar solvents such as DMAc, DMSO and NMP etc., except of the poly(est er imide) prepared from BNDEDA and benzidine. Poly(ester imide)s based on B NDEDA can also be readily dissolved in weakly polar solvents such as THF, C H2Cl2 and CHCl3. The glass transition temperatures of these polyimides are in the range of 210-310 degrees C; the 5% weight loss temperatures are in t he range of 390-465 degrees C in nitrogen and 384-447 degrees c in air. The se polymers from light yellow, tough films that were transparent above 365 nm. The effects of different flexible units attached in the 2- and 2'-posit ions, i.e., amide, ester and ether, on the properties of the polyimides obt ained are discussed.