导电粒子掺杂纳米纤维复合膜的电磁特性及吸波预测  

Electromagnetic characteristics and wave absorption performance prediction of nanofiber composite films doped by conductive particles

作　　者：葛贝贝 李亮[1,2] 高苏微 王慧萍 朱书月 刘让同 GE Beibei;LI Liang;GAO Suwei;WANG Huiping;ZHU Shuyue;LIU Rangtong(Zhongyuan University of Technology,Zhengzhou 451191,China;Collaborative Innovation Center of Advanced Textile Equipment,Zhengzhou 451191,China)

机构地区：[1]中原工学院,郑州451191 [2]先进纺织装备技术省部共建协同创新中心,郑州451191

出　　处：《工程塑料应用》2024年第9期133-142,共10页Engineering Plastics Application

基　　金：国家重点研发计划项目(2017YFB0309100);河南省重点研发与推广专项(科技攻关)(242102320262);中原工学院研究生科研创新项目(YKY2023ZK22)。

摘　　要：选用氧化锌、石墨烯和铜粉等导电粒子作为电磁介质,采用“静电纺丝+喷雾法”制备导电粒子掺杂聚乳酸纳米纤维复合膜,对复合膜的结构和电磁特性进行表征,并研究导电粒子种类及其含量、膜材厚度对复合膜电磁参数的影响,进而预测膜的吸波性能。结果表明,导电粒子掺杂复合膜的电磁参数特征与导电粒子含量有关,导电粒子质量分数增加,膜材的介电常数实部和虚部明显表现出增大的趋势,石墨烯掺杂复合膜具有较大的介电参数,介电损耗远大于磁损耗,石墨烯质量分数为25%的复合膜在膜材厚度为10.0 mm时的反射损耗为-27.51 dB。掺杂膜材厚度增加,同质量分数下反射损耗的峰值逐渐从高频向低频移动,复合膜倾向于选择吸收波长更长、频率更低的电磁波;导电粒子含量增加,最小反射损耗值逐渐减小,较多的导电粒子能够形成较完整的导电网络,极化能力和介电损耗增强,电磁损耗增加。反射损耗值和吸收带宽与导电粒子含量和膜材厚度有关,可通过调节导电粒子含量和膜材的厚度来调控膜材料的电磁吸收性能。Conductive particles such as zinc oxide,graphene and copper powder were selected as electromagnetic media,and polylactic acid nanofiber composite films doped by conductive particles were prepared by“electrospinning+spray method”.The structure and electromagnetic characteristics of the composite films were characterized,and the effects of conductive particle types and contents,and the film thickness on electromagnetic parameters of the composite films were studied,so as to predict their wave absorption performances.The results show that the electromagnetic parameter characteristics of the films doped with conductive particles are related to the contents of conductive particles.As the mass fraction of conductive particle increases,the dielectric constant real part and imaginary part of the film show a clear increasing trend.The graphene doped film has large dielectric parame-ters,and the dielectric loss is much larger than the magnetic loss.The graphene doped film with 25 wt%graphene has a reflection loss of-27.51 dB at the film thickness of 10.0 mm.With the increase of the thickness of the doped film,the peak value of reflection loss gradually moves from high frequency to low frequency at the same mass fraction,and the film tends to choose the electromag-netic wave with longer absorption wavelength and lower frequency.With the increase of conductive particle content,reflection loss value decreases gradually,more conductive particles can form a more complete conductive network,polarization ability and dielec-tric loss are enhanced,and electromagnetic loss is increased.Reflection loss value and absorption bandwidth are related to the content of conductive particle and film thickness,and the electromagnetic absorption performance of the film material can be regulat-ed by adjusting the content of conductive particles and the thickness of the doped film.

关 键 词：导电粒子 电磁特性 吸波性能 纳米纤维复合膜 静电纺丝 石墨烯 

分 类 号：TQ340.1[化学工程—化纤工业]