Design and synthesis of composite films with excellent microwave absorption performance using polydimethylsiloxane as flexible frame. (15th July 2022)

• Record Type: Journal Article
• Authors: Li, Songyan; Tian, Xiaoxia; Wang, Jiafu; Ma, Lisi; Li, Chenchen; Qin, Zhe; Qu, Shaobo
• Is Part Of: Polymers for advanced technologies. Volume 33:Number 10(2022)
• Page Start: 3447
• Page End: 3454
• Publication Date: 2022-07-15
• Subjects: carbonyl iron powder -- composite film -- extra conducting electric carbon black -- microwave absorption -- polydimethylsiloxane; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.5798
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract: The preparation of flexible ultra‐thin microwave absorption composite films for practical application is a known challenge. In this work, we use polydimethylsiloxane as the frame, extra conducting electric carbon black and carbonyl iron powder as absorbents. The microwave absorption performances of composite films can be well adjusted by changing the mass ratio of extra conducting electric carbon black and carbonyl iron powder. Meanwhile, the maximum reflection loss can reach −50.53 dB with a thickness of 1.63 mm, while the effective absorption bandwidth can achieve 4.80 GHz at a 1.48 mm thickness. The excellent microwave absorption performance can be attributed to the synergistic effect of good impedance matching, magnetic loss, dielectric loss and conduction loss. Importantly, the preparation of this ultra‐thin composite film explores the application of polydimethylsiloxane as a flexible framework material in microwave absorption field.