Preparation of poly(amic acid) nanoparticles using the reprecipitation method and their imidization

Masao Suzuki, Hitoshi Kasai, Hirohiko Miura, Shuji Okada, Hidetoshi Oikawa, Takayasu Nihira, Hiroyoshi Fukuro, Hachiro Nakanishi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We have successfully fabricated polyimide (PI) nanoparticles through chemical imidization of poly(amic acid) (PAA) precursor nanoparticles, which were prepared by the reprecipitation method. PAA used as a precursor polymer was produced by polyaddition of 4,4′-oxydianiline and 4,4′ -(2,2-hexafluoroisopropylidene) diphthalic anhydride in N-methyl-2-pyrrolidinone. Chemical imidization of PAA nanoparticle was performed by adding a small amount of pyridine/acetic anhydride mixture (1:1) into the PAA nanoparticle dispersion. Almost quantitative conversion from PAA to PI was confirmed by IR spectra. According to SEM observations, both PAA and the corresponding PI nanoparticles were spherical. The particle size distribution was found by DLS measurements to be unchanged before and after the chemical imidization.

Original languageEnglish
Pages (from-to)637-641
Number of pages5
Issue number10
Publication statusPublished - 2002


  • Chemical imidization
  • Nanoparticles
  • Poly(amic acid)
  • Polyimide
  • Reprecipitation method

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics


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