- 作者: 楊金平
- 作者服務機構: Department of Chemical Engineering, Tatung University, 40 Chungshan North Road, 3rd Section, Taipei 104, Taiwan, R.O.C
- 中文摘要: 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.
- 英文摘要: --
- 中文關鍵字: 3,3¢,4,4¢-Diphenylsulfonetetracarboxylic dianhydride; Organosoluble; Copolyimides.
- 英文關鍵字: 3,3¢,4,4¢-Diphenylsulfonetetracarboxylic dianhydride; Organosoluble; Copolyimides.