摘要
为了丰富乙烯-醋酸乙烯酯共聚物(EVA)基纤维的响应方式,实现电致可逆驱动,以纳米六方氮化硼(BN)为导热填料,采用熔融纺丝工艺制备BN/EVA复合纤维,并通过溶胀-浸渍法在纤维表面包覆碳纳米管(CNTs)导电层,制得具有皮芯结构的CNTs/BN/EVA复合纤维。结果表明:CNTs与纤维基体结合紧密,在纤维表面形成了良好的导电通路,CNTs/BN/EVA复合纤维的电导率可达到58.03 S/m,且具有良好的应变传感性能,其检测范围高达281%,具有较高的灵敏度和线性响应度(在175%~281%应变范围,GF为35.19,R^(2)=99.03%),响应时间和回复时间分别为196 ms和189 ms。加捻制得的CNTs/BN/EVA复合纱线在18 V电压下可在12 s内快速升温至111.45℃,且该复合纱线在周期性电刺激条件下表现出稳定的升降温行为,实现了对电致可逆驱动应变的精准调控。
Artificial muscles can produce reversible expansion,twisting,bending,stretching,and other motions under the action of external stimuli(heat,electricity,light,magnetism,humidity,pressure,etc.),which holds potential application value in robotics,medicine,aerospace and other fields.As a class of intelligent stimulus-responsive materials,two-way shape memory polymer(2W-SMP)is an excellent substrate for preparing artificial muscles,because it can facilitate the reversible transition between its original and temporary shapes by adjusting the ambient temperature.However,2W-SMP has shortcomings such as poor thermal conductivity,slow response speed,and single response mode.Therefore,increasing the response speed of 2W-SMP,diversifying its stimulus-response modes,and achieving precise control over reversible actuation strain are of great significance for the application and development of 2W-SMP in the field of artificial muscles.Ethylene-vinyl acetate copolymer(EVA)is a semi-crystalline polymer.Research indicates that cross-linked EVA fibers possess excellent two-way shape memory properties,large reversible actuation strains,good flexibility,and designability.In this paper,nano hexagonal boron nitride(h-BN)was used as thermal conductive fillers,and carbon nanotubes(CNTs)as conductive fillers.BN/EVA composite fibers were prepared by melt spinning process,and CNTs/BN/EVA composite fibers with skin core structure were prepared by swelling and impregnation method.The experimental results show that the CNTs were closely combined with the fiber matrix,forming a good electrically conductive path on the surface of the fiber,and the electrical conductivity of the CNTs/BN/EVA composite fibers could reach 58.03 S/m.The CNTs/BN/EVA composite fibers have good strain sensing performance,with a detection range of up to 281%,and high sensitivity and linearity(in the range of 175%-281%strain,Gauge Factor(GF)of 35.19,R^(2)=99.03%),with response and recovery times of 196 ms and 189 ms,respectively.The twisted CNTs/BN/EVA composite yarns could be rapidly warmed up to 111.45℃in 12 s at 18 V and exhibit stable temperature rise and fall behavior under periodic electrical stimulation conditions,achieving precise regulation of the electrically induced reversible actuation strain in yarn-based artificial muscles.In summary,the EVA-based composite fibers prepared in this thesis combine excellent two-way shape memory properties,reversible electric-driven properties and strain sensing properties,integrate actuation and sensing capabilities into one,and have potential applications in the fields of artificial muscles,wearable devices and robotics.
作者
王文君
董余兵
WANG Wenjun;DONG Yubing(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《现代纺织技术》
北大核心
2024年第11期22-34,共13页
Advanced Textile Technology
基金
中国纺织工业联合会应用基础研究项目(J202102)。
