POS2-0189
Molecular Design of Sulfone-Containing Colorless and Transparent Polyimides
Topic
S2. High-End Characterization/Polymer Physics/Properties
When and Where
Sep 30, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Yun Sang Shin (JeonJu University)
Co-Author(s)
Abstract
A series of six colorless and transparent polyimide (CPI) films were prepared from two structurally distinct dianhydrides, 4,4′-biphenyl dianhydride (BPA) and 3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride (DSDA), in combination with three aromatic diamines. The study was designed to elucidate how backbone rigidity, molecular linearity, and the incorporation of polar sulfone linkages influence the structure–property relationships of CPI materials. The chemical structures of the synthesized polymers were confirmed by FT-IR and solid-state NMR analyses, while their thermal, mechanical, optical, and solubility characteristics were systematically evaluated. The resulting CPI films exhibited distinct property variations depending on the dianhydride structure. BPA-based CPIs, characterized by relatively rigid and linear biphenyl units, formed densely packed molecular architectures that promoted strong intermolecular interactions. Consequently, these films showed higher glass transition temperatures, improved thermal stability, enhanced tensile properties, and lower coefficients of thermal expansion. In contrast, DSDA-based CPIs containing polar sulfone (–SO₂–) groups displayed slightly lower thermal transition temperatures but demonstrated superior optical transparency and solution processability. The electron-withdrawing nature and steric influence of the sulfone linkage effectively reduced chain packing efficiency and suppressed intermolecular charge-transfer interactions, leading to lower coloration and improved solubility. The results clearly demonstrate that subtle variations in backbone architecture provide an effective strategy for tailoring the balance between thermomechanical performance and optical functionality in CPI systems.
