Flame-retardant composites with high electromagnetic interference(EMI)shielding performance are de-sirable for electronic device packaging.Despite great potential of MXene for high EMI,it still remains a great challenge to develop high-performance flame-retardant polymer/MXene composites with excel-lent EMI shielding effectiveness because of the poor oxidative stability of MXene.Herein,phosphory-lated MXene/polypropylene(PP)composites are prepared by coating phosphorylated MXene on PP fabric followed by spraying polyethylenimine(PEI)and hot-pressing.The phosphorylated MXene proves to be more durable against oxidation than pure MXene due to the protection effect of polyphosphates.Upon hot-pressing,melted PP fibers are fused together at their contact points and thus as-prepared composites are bi-continuous with two interpenetrating phases.The composites show significantly improved thermal stability and flame retardancy relative to pure PP,with a low total heat release(THR)of 3.7 kj/g and a heat release rate(HRR)of 50.0 W/g,which are reduced by 78％and 87％,respectively.In addition,the composites exhibit a high electrical conductivity of～36,700 S/m and an EMI shielding performance of～90 dB over the whole frequency range of 8-12 GHz with a thickness of～400 μm.The as-developed PP/MXene composites hold great promise for reliable protection of next-generation electronic devices working in complex environments.

Tingting Tang;Shanchi Wang;Yue Jiang;Zhiguang Xu;Yu Chen;Tianshu Peng;Fawad Khan;Jiabing Feng;Pingan Song;Yan Zhao

College of Textile and Clothing Engineering,Soochow University,Suzhou 215123,China;China-Australia Institute for Advanced Materials and Manufacturing,Jiaxing University,Jiaxing 314001,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Centre for Future Materials,University of Southern Queensland,Springfield Central,QLD 4300,Australia

材料科学技术（英文版）

[1]Tingting Tang;Shanchi Wang;Yue Jiang;Zhiguang Xu;Yu Chen;Tianshu Peng;Fawad Khan;Jiabing Feng;Pingan Song;Yan Zhao-.Flexible and flame-retarding phosphorylated MXene/polypropylene composites for efficient electromagnetic interference shielding)[J].材料科学技术（英文版）,2022(16):66-75

polyphosphates

Flexible,flame,retarding,phosphorylated,MXene,polypropylene,composites,efficient,electromagnetic,interference,shielding,Flame,retardant,high,EMI,performance,sirable,electronic,packaging,Despite,great,potential,still,remains,challenge,polymer,excel,lent,effectiveness,because,poor,oxidative,stability,Herein,PP,prepared,by,coating,fabric,followed,spraying,polyethylenimine,PEI,hot,pressing,proves,more,durable,against,oxidation,than,pure,due,protection,Upon,melted,fibers,fused,together,their,contact,points,thus,continuous,two,interpenetrating,phases,show,significantly,improved,thermal,retardancy,relative,total,heat,release,THR,kj,rate,HRR,which,reduced,respectively,In,addition,exhibit,electrical,conductivity,dB,over,whole,frequency,range,GHz,thickness,developed,hold,promise,reliable,next,generation,devices,working,complex,environments

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