Lei Wang, Zhonglei Ma, Yali Zhang, Hua Qiu*, Kunpeng Ruan and Junwei Gu*. Mechanically Strong and Folding-Endurance Ti3C2Tx MXene/PBO Nanofibers Films for Efficient EMI Shielding and Thermal Management. Carbon Energy, 2022, 10.1002/cey2.174. 2021即时因子19.741.（中国科技期刊卓越行动计划高起点新刊）
https://doi.org/10.1002/cey2.174
Abstract
Electromagnetic interference (EMI) shielding materials with excellent flexibility & mechanical properties, and outstanding thermal conductivity have become a research hotspot in functional composites. In this work, 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 the f-Ti3C2Tx/PNFs films with lamellar structures. When the loadings of f-Ti3C2Tx is 70 wt%, the f-Ti3C2Tx/PNFs film presents the optimal comprehensive properties, with EMI shielding effectiveness (SE) of 35 dB and specific SE/thickness ((SSE, SE/density)/t) of 8211 dB·cm2/g, tensile strength of 125.1 MPa, in-plane thermal conductivity coefficient of 5.82 W/(m·K), and electrical conductivity of 1943 S/m. After repeated folding for 10000 cycles, the EMI SE and tensile strength of f-Ti3C2Tx/PNFs films still maintain at 33.4 dB and 116.1 MPa, respectively. Additionally, f-Ti3C2Tx/PNFs film also shows excellent thermal stability, flame retardancy, and structural stability. It would provide a novel method for the design and fabrication of multifunctional composite films, and greatly expand the applications of MXene and PNFs-based composites in the fields of EMI shielding and thermal management.
兼具柔性、超高力学强度和优异导热性能的电磁屏蔽材料已成为功能复合材料领域的研究热点和重要组成部分。本文通过“溶胶-凝胶-薄膜转化技术”将聚醚酰亚胺功能化的Ti3C2Tx纳米片（f-Ti3C2Tx）与poly(p-phenylene-2,6-benzobisoxazole，PEI)纳米纤维（PNFs）复合制备f-Ti3C2Tx/PNFs有机凝胶，再通过溶剂置换并真空干燥制得层状结构的f-Ti3C2Tx/PNFs薄膜。当f-Ti3C2Tx纳米片用量为70 wt%时，f-Ti3C2Tx/PNFs薄膜具有最佳的综合性能，其屏蔽效能（EMI SE）和比屏蔽效能/厚度（（SSE，SE/密度）/t）分别为35 dB和8211 dB·cm2/g，拉伸强度、面内导热系数（λ//）和电导率（σ）分别为125.1 MPa、5.82 W/(m·K)和1943 S/m；折叠10000多次后其EMI SE和拉伸强度仍维持在33 dB和116.1 MPa。f-Ti3C2Tx/PNFs薄膜同时具有卓越的热稳定性（800oC退火后的质量损失仅为18.7 wt%）、优异的阻燃性能（酒精灯灼烧下无任何火焰）和结构稳定性（水中超声1 hr或浸泡72 hrs后无任何结构破坏）。这种具有优异λ、超高力学性能、卓越屏蔽性能、出色阻燃性能和耐疲劳性能的f-Ti3C2Tx/PNFs薄膜将为多功能复合薄膜的设计研发提供一定的借鉴意义，并极大地拓展MXene基纳米复合材料以及PNFs基纳米复合材料在电磁屏蔽和热管理领域中的应用。