Herein,a low-cost,biodegradable,and high-performance microwave shielding graphite/starch mate-rial was fabricated via constructing a cation-π interaction between ammonium ions and graphite.The graphite flakes and starch were firstly mixed with distilled water containing ammonium hydroxide to form graphite/starch slurry under an ultrasonic assistant.The cation-π interaction could improve delam-ination degree and dispersion of graphite in starch matrix.The slurry was first used as a coating material on the surface of wood and paper to develop shielding packages.The effect of coating thickness and coating layers on EM shielding property of the materials was investigated.Second,the composites with a high orientation of graphite were fabricated by compression at high pressures.The electrical conductivity and EM shielding effectiveness(SET)of the materials were greatly enhanced by construction of cation-πinteraction and orientation of graphite.Specifically,the EM SET values increased from 56.9 to 66.8 dB for the composites with 50 wt.％graphite and 2.0 mm in thickness by constructing cation-π interaction.The EM SET values raised from 17.4 to 66.8 dB via the graphite orientation in the materials with the same components and thickness.The shielding mechanism of the compressed composites with orientation dis-persion of graphite was also discussed in comparison to the coating layer with random dispersion of graphite.

Yi Yang;Jun-Ru Tao;Dian Yang;Qian-Ming He;Xu-Dong Chen;Ming Wang

Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing,School of Chemistry and Chemical Engineering,Southwest University,Chongqing 400715,China;Key Laboratory of Polymer Composite and Function Materials of Ministry of Education,Key Laboratory for Designed Synthesis and Applied Polymer Materials,School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275,China

材料科学技术（英文版）

[1]Yi Yang;Jun-Ru Tao;Dian Yang;Qian-Ming He;Xu-Dong Chen;Ming Wang-.Improving dispersion and delamination of graphite in biodegradable starch materials via constructing cation-π interaction:Towards microwave shielding enhancement)[J].材料科学技术（英文版）,2022(34):196-205

delam

Improving,dispersion,delamination,graphite,biodegradable,starch,materials,via,constructing,cation,interaction,Towards,microwave,shielding,enhancement,Herein,low,cost,high,performance,was,fabricated,between,ammonium,ions,flakes,were,firstly,mixed,distilled,water,containing,hydroxide,slurry,under,ultrasonic,assistant,could,improve,degree,matrix,used,coating,surface,wood,paper,develop,packages,thickness,layers,EM,property,investigated,Second,composites,orientation,by,compression,pressures,electrical,conductivity,effectiveness,SET,greatly,enhanced,construction,Specifically,values,increased,from,dB,wt,raised,same,components,mechanism,compressed,also,discussed,comparison,random

0.413089