Mechanically strong and folding-endurance Ti3C2Tx MXene/PBO nanofibers films for efficient EMI shielding and thermal management
writer：[2] Lei Wang, Zhonglei Ma, Yali Zhang, Hua Qiu*, Kunpeng Ruan and Junwei Gu*
keywords：EMI
source：期刊
Issue time：2022年
Electromagnetic interference (EMI) shielding materials with excellent flexibility
and mechanical properties and outstanding thermal conductivity have
become a hot topic of research in functional composites. In this study, the
“sol–gel‐film conversion technique” is used to assemble polyetherimidefunctionalized
Ti3C2Tx nanosheets (f‐Ti3C2Tx) with poly(p‐phenylene‐2,6‐
benzobisoxazole) (PBO) nanofibers (PNFs), followed by dialysis and vacuum
drying to prepare f‐Ti3C2Tx/PNF films with lamellar structures. When the
loading of f‐Ti3C2Tx is 70 wt%, the f‐Ti3C2Tx/PNF film presents optimal comprehensive
properties, with an EMI shielding effectiveness (SE) of 35 dB and a
specific SE/thickness ((SSE, SE/density)/t) of 8211 dB cm2/g, a tensile strength
of 125.1 MPa, an in‐plane thermal conductivity coefficient (λ) of 5.82 W/(m K),
and electrical conductivity of 1943 S/m. After repeated folding for 10,000 cycles,
the EMI SE and the tensile strength of f‐Ti3C2Tx/PNFs films still remain
33.4 dB and 116.1 MPa, respectively. Additionally, the f‐Ti3C2Tx/PNF film also
shows excellent thermal stability, flame retardancy, and structural stability.
This would provide a novel method for the design and fabrication of multifunctional
composite films and considerably expand the applications of
MXene‐ and PNF‐based composites in the fields of EMI shielding and thermal
management.