期刊
CARBON ENERGY
卷 4, 期 2, 页码 200-210出版社
WILEY
DOI: 10.1002/cey2.174
关键词
electromagnetic interference shielding; PBO nanofibers; thermal management; Ti3C2Tx MXene
类别
资金
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX202053]
- Fundamental Research Funds for the Central Universities [D5000210627]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province of China [2019JC-11]
- Foundation of National Natural Science Foundation of China [51903145, 51973173]
This study fabricated f-Ti3C2Tx/PNF films with excellent performance using the sol-gel-film conversion technique. The films exhibited outstanding electromagnetic shielding effectiveness, tensile strength, thermal conductivity, and electrical conductivity, as well as good thermal stability, flame retardancy, and structural stability.
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 polyetherimide-functionalized 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 cm(2)/g, a tensile strength of 125.1 MPa, an in-plane thermal conductivity coefficient (lambda) 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.
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