Processable and sustainable poly(ether ether ketone imide)s by chemical imidization through one stage method

New series of aromatic poly(ether ether ketone imide)s were synthesized from 1,3-bis-4-(4″-aminophenoxy benzoyl) benzene and aromatic dianhydrides such as BTDA, PMDA. BPDA, HFDA, OPDA, by two step polymerization method. Starting materials and difficulties in synthesis or processing, relatively few of these polymers achieved commercially viability. These poly(ether ether ketone imide)s were characterized by FT-IR, Solubility, Inherent viscosity, TGA, DSC and XRD. Inherent viscosities of these poly(ether ether ketone imide)s were in the range of 0.23–0.40 dL/g in DMF, indicating formation of moderate molecular weight of polymers. Currently there is lot of difficulties to synthesize processable polyimides due to hard, rigid, bulky nature it become more drastic to process polymers. We were synthesized polyimides showed good solubility in polar aprotic solvent due to incorporation of functional moiety such as ether, ketone, flexible linkages in the backbone of polymer chain rather than aromatic polyimides. poly(ether ether ketone imide)s showed good solubility in polar aprotic solvents such as N,N-dimethyl acetamide (DMAc), N-methyl 2-pyrrolidone (NMP), N,N,-dimethyl formamide (DMF), and Dimethyl sulphoxide (DMSO). These poly(ether ether ketone imide)s had glass transition temperatures; as determined by DSC, in the range of 241–270 °C. These polymers showed similar decomposition patterns and had no weight loss below 235 °C and temperatures for 10 % weight loss (T 10 ) were in the range of 269–370 °C, indicating that these polymers showed good thermal stability and degradation at 800 °C indicating its sustainability. As per the TGA data char yield of these synthesized poly(ether ether ketone imide)s were very low char yield or residual weight of polyimides at 700 °C temperature indicates low limiting oxygen index value that is more flammable and sustainable polymers.