摘要
选用高机械强度和耐气候性乙烯-乙烯醇共聚物(EVOH)作为基体,添加高效导电填料多壁碳纳米管(MWCNTs),同时为了进一步提高材料性能,添加了聚醚多元醇(EOPO)与4,4'-二苯基甲烷二异氰酸(MDI)的共聚物.采用绿色环保的超临界二氧化碳发泡法制备EVOH/MDI-g-EOPO/MWCNTs纳米复合发泡材料,结果表明在EVOH/MDI-g-EOPO/MWCNTs复合材料中引入多孔结构,利用多层界面反射-吸收电磁波,比电磁屏蔽性能提升270%.通过调控MWCNTs体积含量与泡孔结构,当MWCNTs体积含量达到2.7 wt%时,EVOH/MDI-g-EOPO/MWCNTs复合发泡材料在X波段(9~12 GHz)表现出优异的比电磁屏蔽效能(41.76 dB·cm^(3)/g).
With the rapid development of global science and technology,electromagnetic radiation pollution is becoming more and more serious,and there is an urgent need for electromagnetic shielding materials,which require higher performance:light weight,high mechanical strength,high conductivity,and good electromagnetic interference shielding effect.In order to meet the requirements,ethylene-vinyl alcohol copolymer(EVOH)with high mechanical strength and good weather resistance was selected as the matrix,and multi-walled carbon nanotubes(MWCNTs)with high-efficiency conductive filler were added.Meanwhile,in order to further improve the material properties,a copolymer of polyether polyol(EOPO)and 4,4'-diphenylmethane diisocyanate(MDI)was added.In this paper,EVOH/MDI-g-EOPO/MWCNTs nano-composite foams were prepared by supercritical carbon dioxide foaming method,which is environmentally friendly.The results show that the introduction of a porous structure into EVOH/MDI-g-EOPO/MWCNTs composites,and the use of multilayer interfaces to reflect and absorb electromagnetic waves,can improve the electromagnetic shielding performance by 270%.By adjusting the MWCNTs content and cell structure,when the MWCNTs volume content reaches 2.7 vol%,the EVOH/MDI-g-EOPO/MWCNTs composite foam material exhibits an excellent specific electromagnetic shielding efficiency(41.76 dB·cm3/g)in the X-band(9-12 GHz).
作者
刘云杰
金碧辉
马昊宇
龚鹏剑
牛艳华
Chul B.Park
李光宪
Yun-jie Liu;Bi-hui Jin;Hao-yu Ma;Peng-jian Gong;Yan-hua Niu;Chul BPark;Guang-xian Li(State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065;Department of Mechanical and Industrial Engineering,University of Toronto,Toronto,Canada M5S 3G8)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2023年第1期106-120,共15页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51703146,52073187)
四川省科学技术厅国际合作(项目号2020YFH0009)资助项目.
关键词
电磁屏蔽
乙烯-乙烯醇共聚物
超临界二氧化碳发泡
多壁碳纳米管
多孔纳米复合材料
Electromagnetic shielding
Ethylene-vinyl alcohol copolymers
Supercritical carbon dioxide foaming
Multi-walled carbon nanotubes
Porous nanocomposites
作者简介
通讯联系人:龚鹏剑,E-mail:pgong@scu.edu.cn;通讯联系人:李光宪,E-mail:guangxianli@scu.edu.cn。
