210492-39-0Relevant articles and documents
Synthesis and characterization of organosoluble copolyimides based on 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride and a pair of aromatic diamines containing 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene
Yang, Chin-Ping,Chen, Ruei-Shin,Wang, Ming-Jui
, p. 115 - 121 (2003)
A series of copolyimides was synthesized from commercial 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride with a pair of diamines, which contained 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene. The intermediate poly(amic acid)s had the inherent viscosities of 0.52-1.52 dL/g and were thermally converted into copolyimides. These copolymers were soluble in a variety of organic solvents such as NMP, DMAc, and DMF, and almost all of them could even be dissolved in less polar solvents such as m-cresol, pyridine, and dioxane, showing a better solubility than corresponding homopolymers. Copolyimide films had tensile strengths of 87-160 MPa, elongations at a break of 9-12%, and initial moduli of 1.9-2.2 GPa. The glass transition temperatures of these copolymers were in the range of 262-288 °C, lower than that of homopolymers. The copolyimides had 10% weight loss temperatures in the range of 495-522 °C under nitrogen and 508-521 °C under air atmosphere, and they left more than 43% residue even at 800 °C in nitrogen. The thermal stability of copolymers was somewhat sacrificed due to the copolymerization, but they still belong under heat-resistant polymeric materials.
