POS7-0643
Enhanced Absorption-Dominant EMI Shielding of Polyimide Composite Films via Thermal Oxidation of Carbonyl Iron Powder
Topic
S7. Innovations in Polymeric Composites: From Design and Processing to Industrial Applications
When and Where
Oct 1, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Jinkee HONG
Ki Su KIM
Presenter(s)
Min Hye Woo (Department of Organic Materials Engineering, Chungnam National University)
Co-Author(s)
Abstract
With the increasing demand for lightweight and flexible electromagnetic interference (EMI) shielding materials, polyimide (PI)-based composites have attracted significant interest owing to their excellent thermal and mechanical stability. In this study, flexible PI composite films containing thermally oxidized carbonyl iron powder (CIP) were fabricated to investigate the effect of filler phase transformation on EMI shielding performance. Pristine CIP was thermally oxidized to form iron oxide phases, and the phase transition was confirmed by X-ray diffraction. Composite films containing either pristine or oxidized CIP were prepared through solution mixing followed by thermal imidization. The morphology, filler distribution, thermal stability, mechanical properties, and EMI shielding behavior of the composites were systematically compared. Thermal oxidation of CIP altered the magnetic characteristics and electrical network structure within the PI matrix, resulting in enhanced absorption-dominant EMI shielding performance. These findings demonstrate that phase engineering of magnetic fillers is an effective strategy for improving the shielding efficiency of flexible PI composite films and provide insights into the design of high-performance absorption-based EMI shielding materials for advanced electronic applications.
Keywords: Polyimide composites, Carbonyl iron powder, Thermal oxidation, EMI shielding, Absorption-dominant shielding
Keywords: Polyimide composites, Carbonyl iron powder, Thermal oxidation, EMI shielding, Absorption-dominant shielding
