固液桥联复合材料的双材料直写制备及电磁屏蔽性能  

Dual-material direct ink writing preparation and electromagnetic shielding properties of bridged solid-liquid composites

作　　者：邵朋朋 徐势轩 华晨曦 宋欣雨 程昌利 刘禹 王震宇 SHAO Pengpeng;XU Shixuan;HUA Chenxi;SONG Xinyu;CHENG Changli;LIU Yu;WANG Zhenyu(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi 214122,Jiangsu,China;Jiangda Vibration Isolator Co.,Ltd.,Wuxi 214024,Jiangsu,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [3]无锡市江大隔振器有限公司,江苏无锡214024

出　　处：《精细化工》2024年第12期2660-2667,共8页Fine Chemicals

基　　金：国家自然科学基金项目(52375338);“太湖之光”科技攻关计划项目(G20212034);江苏省食品先进制造装备技术重点实验室自主研究课题(FMZ202201)。

摘　　要：以高黏度硅橡胶为固相墨水、炭黑/低黏度硅橡胶为液相墨水,使用双材料直写工艺制备了固液桥联复合材料。采用超景深数码显微镜与X射线三维动态显微成像平台对固液桥联复合材料的结构进行了表征,测试了不同液相桥联跨度(0.4、0.8、1.2 mm)固液桥联复合材料的拉伸性能、电导率及总电磁屏蔽效能,并评价了固液桥联复合材料在应变作用和循环载荷作用下的总电磁屏蔽效能稳定性。结果表明,固相和液相两者交替排列为规则的三维网格状结构,实现了固液桥联复合材料力学性能和电磁屏蔽性能的协同提高。固液桥联复合材料的断裂伸长率、电导率及总电磁屏蔽效能均随着液相桥联跨度的增大而提高,液相桥联跨度为1.2 mm的固液桥联复合材料(SL-1.2)的断裂伸长率最高,为233%,电导率最大,为0.45 S/m,总电磁屏蔽效能最强,为27.41dB。SL-1.2在75%的应变作用下,其总电磁屏蔽效能比未拉伸状态增加了0.49%,在循环载荷(1000圈)作用下,其总电磁屏蔽效能一直保持稳定。Bridged solid-liquid composites were prepared by a dual-material direct ink writing process using high-viscosity silicone rubber as solid-phase ink and carbon black/low-viscosity silicone rubber as liquid-phase ink,and characterized by ultra-depth of field digital microscope and three-dimensional X ray imaging platform.The tensile properties,electrical conductivity and total electromagnetic shielding effectiveness of the bridged solid-liquid composites with different liquid-phase bridging spans(0.4,0.8,1.2mm) were analyzed,and the stability of the total electromagnetic shielding effectiveness under strain and cyclic loading was further evaluated.The results showed that the alternate arrangement of solid and liquid phases into a regular three-dimensional lattice structure led to the synergistic improvement in mechanical properties and electromagnetic shielding properties of the bridged solid-liquid composites.The elongation at break,electrical conductivity and total electromagnetic shielding effectiveness of bridged solid-liquid composites increased with the increment of liquid-phase bridging span,while the one with liquid-phase bridging span of 1.2 mm(SL-1.2) exhibited the highest elongation at break(233%),the largest electrical conductivity(0.45 S/m),and the strongest total electromagnetic shielding effectiveness(27.41 dB).Under 75% strain,the total electromagnetic shielding effectiveness of SL-1.2 increased by 0.49% compared with that under 0 strain,and its total electromagnetic shielding effectiveness remained stable under cyclic loading(1000 turns).

关 键 词：导电复合材料 双材料直写 固液桥联结构 3D打印 电磁屏蔽 功能材料 

分 类 号：TB34[一般工业技术—材料科学与工程]