Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (22): 2569-2573. Previous Articles    


一种含三氟甲基取代不对称芳香二胺及其可溶性透明聚醚酰亚胺 的合成与表征

汪称意 李 光* 江建明


  1. (东华大学材料学院纤维材料改性国家重点实验室 上海 201620)
  • 投稿日期:2008-05-04 修回日期:2008-06-14 发布日期:2008-11-28
  • 通讯作者: 李光

Soluble and Optically Transparent Poly(ether imide) Based on a Novel Aromatic Unsymmetrical Trifluoromethylated Diamine

WANG, Chen-Yi LI, Guang* JIANG, Jian-Ming   

  1. (State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science
    and Engineering, Donghua University, Shanghai 201620)
  • Received:2008-05-04 Revised:2008-06-14 Published:2008-11-28
  • Contact: LI, Guang

A novel aromatic unsymmetrical fluorinated diamine monomer, (4’-(4’’-amino-2’’-trifluoro-
methylphenoxy)-3’,5’-dimethylphenyl)(4-aminophenyl)methanone (3), was successfully synthesized in three steps using 2,6-dimethylphenol and 4-nitrobenzoyl chloride as starting material, which was then employed to prepare a fluorinated poly(ether imide) with commercial aromatic dianhydride, 4,4’-oxydiphthalic anhydride. The inherent viscosity of the resulting polyimide was 0.68 dL/g, and it exhibited an excellent solubility and optical property. It was readily soluble not only in some strong polar solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, and N,N-dimethylformamide, but also had a good solubility in some low-boiling-point solvents such as chloroform, tetrahydrofuran, and dichloromethane. The polyimide film showed high optical transparency and colorless, with a UV-vis absorption edge at 352 nm. Furthermore, the polyimide also showed good thermal and mechanical properties. Onset decomposition temperature (Td) of the polyimide was at 508 ℃ under nitrogen atmosphere, and its glass-transition temperature (Tg) was at 288 ℃. The polyimide film had strengths at break at 91 MPa, elongations to break of 10%~15%, and initial moduli at 1.7 GPa.

Key words: polyimide, solubility, transparency, trifluoromethyl, unsymmetrical