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...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 Ti3C2Txnanosheets(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-Ti3C2Txis 70 wt%,the f-Ti3C2Tx/PNF film presents optimal comprehensive properties,with an EMI shielding effectiveness(SE)of 35 dB and a specific SEhickness((SSE,SE/density))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.展开更多
基金The authors are grateful for the support of and funding from the Foundation of National Natural Science Foundation of China(51903145 and 51973173)the Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province of China(2019JC-11)+1 种基金Fundamental Research Funds for the Central Universities(D5000210627)L.Wang is grateful to the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX202053).
摘要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 Ti3C2Txnanosheets(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-Ti3C2Txis 70 wt%,the f-Ti3C2Tx/PNF film presents optimal comprehensive properties,with an EMI shielding effectiveness(SE)of 35 dB and a specific SEhickness((SSE,SE/density))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.
基金Ph.D.Programs Foundation of Ministry of Education of China(20090201110005)Natural Science Foundation of Jiangsu Province(SBK201022919)the Joint supervision scheme of Hong Kong Polytechnic University(GU-784)