Synthesis and properties of new aromatic polyimides based on 2,2′‐dibromo‐4,4′,5,5′‐benzophenone tetracarboxylic dianhydride

Abstract

New polyimides with enhanced thermal stability and high solubility were synthesized in common organic solvents from a new dianhydride, 2,2′‐dibromo‐4,4′,5,5′‐benzophenone tetracarboxylic dianhydride (DBBTDA). DBBTDA was used as monomer to synthesize polyimides by using various aromatic diamines. The polymers were characterized by IR and NMR spectroscopy and elemental analysis. These polyimides had good inherent viscosities in N‐methyl‐2‐pyrrolidinone (NMP) and also high solubility and excellent thermo‐oxidative stability, with 5 % weight loss in the range 433 to 597 °C. Copyright © 2004 Society of Chemical Industry

Synthesis and characterization of new poly(diketone imide)s derived from 1,4-bis(3,4-dicarboxybenzoyl)benzene dianhydride and various diamines

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18] It is also recognized that ketone links inserted in the polyimide backbone could improve their solubility and mold ability, and various poly(ketone imide)s have been developed from the dianhydride or the diamine component containing ketone moieties. [19][20][21][22][23][24][25][26][27] In addition, several poly(diketone imide)s (PDKIs) using the dianhydride [28][29][30][31][32] or diamine [33][34][35][36][37][38] monomers containing diketone groups were also investigated. As part of our continuing efforts to develop new aromatic polyimides containing carbonyl bridging groups, 39 we herein report a series of new PDKIs derived from a bis(ketone anhydride) monomer, namely 1,4-bis (3,4-dicarboxybenzoyl)benzene dianhydride with six aromatic diamines via a conventional two-stage process undergoing ring-opening polycondensation to form the PAAs and further thermal or chemical imidization.…”