Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2944.doi: 10.7503/cjcu20210327

• Polymer Chemistry • Previous Articles     Next Articles

Synthesis and Properties of Soluble Transparent Polyimides Containing tert-Butyl and Isobutyl Groups

WANG Shoubai1,2, WU Xiuming3, WU Jinming1, TANG Yanfeng1, SHU Chen3, ZHONG Min3, HUANG Wei3(), YAN Deyue3   

  1. 1.School of Chemistry and Chemical Engineering
    2.Xinglin College,Nantong University,Nantong 226019,China
    3.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • Received:2021-05-11 Online:2021-09-10 Published:2021-09-08
  • Contact: HUANG Wei
  • Supported by:
    the Science and Technology Commission of Shanghai Municipality Basic Research Project, China(16JC1403600)


A novel diamine containing tert-butyl and isobutyl groups{4,4′-(2-isobutyl)bis[2-(tert-butyl) aniline], IBBTBA} was synthesized from 2-tert-butyl aniline and isobutyraldehyde. Then a series of polyimides(PIs) was prepared from IBBTBA and four aromatic dianhydrides by the high-temperature one-plot polymerization. The structure and properties of the PIs were investigated in detail. The results indicate that all PIs show good solubility not only in high-boiling aprotic solvents[N-methylpyrrolidone(NMP), NN-dimethylacetamide(DMAc), etc.], but also in low boiling point solvents[ethyl acetate(EA), CHCl3, etc.]. They can be processed into flexible films easily by the solution casting or blade coating. All the resulting PI films(around 25 μm in thickness) have good transparency with the average transmittance from 82.3% to 89.1% and the cut-off wavelength from 313 nm to 363 nm in the visible light region. Satisfactorily, all PIs still maintain the good thermal stability. Their 5% mass loss temperatures(in N2) are above 480 ℃ and Tg values are in the range from 307 ℃ to 356 ℃. Besides, all PIs films exhibit good mechanical properties and hydrophobicity. In summary, these PI films are potential candidates for applications in the fields of photovoltaic power generation, flexible display and so on.

Key words: Polyimide, tert-Butyl, iso-Butyl, Solubility, Transparence

CLC Number: