Ice-templated Aramid Nanofiber Aerogel-reinforced PTFE Composites for High-frequency Applications

Abstract

We fabricated aramid nanofiber aerogels using ice-templated and freeze-dried method, and introduced them as a 3D filler framework in PTFE-based composites. Additionally, the deprotonation method was employed to introduce reactive groups on the aramid nanofiber aerogels’ surface, strengthening the interfacial bonding between the aramid nanofiber aerogels and the PTFE matrix. This interfacial modification strategy effectively improves the interfacial compatibility of the composites. As a result, the prepared composites exhibit remarkable tensile strength (36 MPa), a low coefficient of thermal expansion (55 ppm/°C), and excellent dielectric properties (dielectric constant (D_k 2.18), dielectric loss (D_f <0.003) at 10 GHz), making them highly suitable for high-frequency integrated devices.

Keywords

PTFE-based composites / aramid nanofiber aerogel / 3D filler / thermal expansion / dielectric properties

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