Mechanically strong and folding‐endurance Ti 3 C 2 T x MXene/PBO nanofiber films for efficient electromagnetic interference shielding and thermal management
Mechanically strong and folding‐endurance Ti 3 C 2 T x MXene/PBO nanofiber films for efficient electromagnetic interference shielding and thermal management
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DOI：
10.1002/cey2.174
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发表时间：
2022-01
期刊：
影响因子：
20.5
通讯作者：
Lei Wang;Zhonglei Ma;Yali Zhang;Huaili Qiu;Kunpeng Ruan;Junwei Gu
中科院分区：
文献类型：
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作者：
Lei Wang;Zhonglei Ma;Yali Zhang;Huaili Qiu;Kunpeng Ruan;Junwei Gu
电磁干扰屏蔽材料以其优异的柔韧性和力学性能以及优异的导热性能成为功能复合材料研究的热点。本研究采用“溶胶-凝胶-膜转化技术”将聚醚酰亚胺功能化的Ti3C2Tx纳米片（f - Ti3C2Tx）与聚（对苯基- 2,6 -苯并二恶唑）纳米纤维（PNF）组装在一起，然后进行透析和真空干燥，制备出具有层状结构的Ti3C2Tx/PNF薄膜。当加载量为70 wt%时，f - Ti3C2Tx/PNF薄膜的电磁干扰屏蔽效能（SE）为35 dB，比SE/厚度（（SSE， SE/密度）/t）为8211 dB cm2/g，抗拉强度为125.1 MPa，面内导热系数（λ）为5.82 W/(m K)，电导率为1943 S/m。在重复折叠10,000次后，EMI SE和off - Ti3C2Tx/PNFs薄膜的拉伸强度分别保持在33.4 dB和116.1 MPa。此外，f - Ti3C2Tx/PNF薄膜还表现出优异的热稳定性、阻燃性和结构稳定性。这将为多功能复合材料薄膜的设计和制造提供一种新的方法，并大大扩展MXene和PNF基复合材料在电磁干扰屏蔽和热管理领域的应用。
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 Ti3C2Txnanosheets (f‐Ti3C2Tx) with poly(p‐phenylene‐2,6‐benzobisoxazole) (PBO) nanofibers (PNFs), followed by dialysis and vacuum drying to preparef‐Ti3C2Tx/PNF films with lamellar structures. When the loading off‐Ti3C2Txis 70 wt%, thef‐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 off‐Ti3C2Tx/PNFs films still remain 33.4 dB and 116.1 MPa, respectively. Additionally, thef‐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.