Towards solution-processable, thermally robust, transparent polyimide-chain-end tethered organosilicate nanohybrids

Ki Ho Nam, Jeong un Jin, Dong Hoon Lee, Haksoo Han, Munju Goh, Jaesang Yu, Bon Cheol Ku, Nam Ho You

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The main challenge to developing future display substrates is to synthesize flexible substrate materials that also have excellent optical and thermal properties, and low thermal expansion number. In this study, a novel trifluoromethylated asymmetric aromatic diamine, 4-[[4-(4-amino-2-trifluoromethylphenoxy)phenyl]sulfonyl-3-(trifluoromethyl)]benzenamine (AFPSFB), was synthesized through nucleophilic substitution. Conventional two-step polycondensation of AFPSFB with commercially available tetracarboxylic dianhydrides enabled the fabrication of fully or semi-aromatic polyimides (PIs). The resulting PIs were highly soluble in polar aprotic solvents with good optical and thermal properties. Next, polyhedral oligomeric silsesquioxane containing an amine group (NH2-POSS) was reacted with the resulting soluble PI. All the PI-POSS nanohybrids displayed excellent optical properties, including high transparency (>91% at 400 nm), low refractive index (<1.5589), and very small birefringence (<0.0025 at 637 nm). End-capping of the POSS and chemical bonding between the POSS and PIs significantly enhanced the thermal and electrical properties. The results provide useful information for designing molecular architectures for manufacturing high-performance flexible substrates in future display devices.

Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalComposites Part B: Engineering
Publication statusPublished - 2019 Apr 15

Bibliographical note

Publisher Copyright:
© 2018

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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