Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (6): 658-663.DOI: 10.11944/j.issn.1000-0518.2019.06.180352

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Synthesis and Properties of Super-high Temperature Diketone Anhydride Polyimides

LIU Yongjun,ZHOU Liyun,SHENG Shouri,SONG Cheng(),HOU Haoqing,SONG Caisheng   

  1. College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China
  • Received:2018-11-06 Accepted:2019-01-14 Published:2019-06-01 Online:2019-06-03
  • Contact: SONG Cheng
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51663011), Science and Technology Research Project of Jiangxi Provincial Department of Education(No.GJJ170177)

Abstract:

A novel diketone anhydride polyimide was synthesized by introducing p-phenylenediamine(PPD) to 4,4'-terephthaloyldiphthalic anhydride through the traditional two-step method in dimethylacetamide(DMAc). The properties of the polyimide were characterized by Fourier transform infrared spectrometer(FT-IR), wide-angle X-ray diffraction(WAXD), differential scanning calorimetric(DSC), dynamic thermomechanical analyzer(DMA), thermal gravimetric analysis(TGA), tensile test and ultraviolet-visible spectrophotometry(UV-Vis). The relationship between different thermal imidization temperature and the properties of the diketone polyimide was studied. The results showed that PAA formed the imide ring structure completely at 320 ℃. The polyimide had good film-forming performance and partially ordered aggregate structure. The polyimide had excellent thermal properties: the glass transition temperature(Tg) was 298 ℃ and the thermal decomposition temperature(T5%) was 523 ℃. The film had a tensile strength of 130 MPa and tensile modulus of 5.77 GPa at 320 ℃. The cutoff wavelength of the film was 375 nm and the film had good transmittance in visible region.

Key words: diketone anhydride polyimide, thermal properties, transmittance