Residual stress behavior and physical properties of colorless and transparent polyimide films

Ki Ho Nam, Wansoo Lee, Kwangwon Seo, Haksoo Han

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A series of polyimide (PI) was prepared by reacting 4,4'-(hexafluoroisopropylidene)-diphthalic anhydride (6FDA) as the anhydride and bis(3-aminophenyl) sulfone (APS), bis[4-(3-aminophenoxy)-phenyl] sulfone (BAPS), 2,2-bis(4-aminophenyl)-hexafluoropropane (6FPD), 2,2-bis[4-(4-aminophenoxy)-phenyl]hexafluoropropane (6FBAPP), 2,2'-bis(trifluorornethyl)benzidine (TFDB), or 1,4-phenyIenediamine (PDA) as the diamine. Residual stress behaviors were detected in-situ during thermal imidization of the polyimide precursors using a thin film stress analyzer (TFSA), and interpreted with respect to their morphology. According to the molecular orientation and packing order, the residual stress varied from 23.1 to 12.5 MPa, decreased with increasing chain rigidity. The thermal properties of the PI films were investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermomechanical analysis (TMA). Their optical properties were measured by ultraviolet-visible spectrophotometer (UV-vis), and spectrophotometry. The properties of PI films were found to be strongly dependent upon the morphological structure. However, trade-offs between residual stress and optical properties were identified.

Original languageEnglish
Pages (from-to)510-517
Number of pages8
JournalPolymer (Korea)
Issue number4
Publication statusPublished - 2014 Jul 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry


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