POS2-0188
Composition-Dependent Properties of Colorless and Transparent Copoly(amide imide)s for Advanced Flexible and Optoelectronic Devices
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 colorless and transparent copoly(amide imide) (Co-CPAI) films were prepared from N,N′-[2,2′-bis(trifluoromethyl)-4,4′-biphenylene]bis(3-aminobenzamide) (m-MPAB) and mixed dianhydride systems consisting of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 4,4′-oxydiphthalic anhydride (ODPA). By systematically varying the dianhydride composition, the relationship between molecular structure and the resulting thermal, mechanical, optical, and solution-processing characteristics was examined. Structural variations arising from the different dianhydride units significantly influenced chain packing behavior, intermolecular interactions, and free-volume characteristics of the copolymers. The incorporation of a higher proportion of 6FDA promoted increased chain mobility and free volume due to its bulky fluorinated structure, leading to enhanced optical transparency, higher glass-transition temperatures, and improved solubility. In contrast, increasing the ODPA content produced relatively compact molecular packing and stronger intermolecular interactions, resulting in superior thermal decomposition resistance and mechanical performance. Despite these compositional differences, all Co-CPAI films maintained excellent overall property balances, exhibiting glass-transition temperatures above 250 °C and decomposition temperatures exceeding 430 °C. Optical measurements demonstrated outstanding transparency throughout the visible region with very low yellow index values of approximately 2–3, indicating effective suppression of coloration. Furthermore, the films were readily soluble in several polar aprotic organic solvents, providing favorable processability for solution-based fabrication. The present study demonstrates that precise control of dianhydride composition offers an effective strategy for optimizing the performance of Co-CPAI materials.
