摘要
通过同轴静电纺丝技术,将发泡剂偶氮二甲酸二乙酯(DEAD)和环氧树脂(EP)的混合物封装进聚丙烯腈(PAN)纳米纤维中,制备出超薄核壳纳米纤维毡铺覆在碳纤维织物界面,树脂注入和固化后形成具有超薄自愈合智能夹层的CFRP。利用三点弯曲试验评估了超薄自愈合智能夹层对CFRP层合板损伤失效弯曲强度的自愈合效应。结果表明:PAN核壳纳米纤维及其封装的自愈合剂热性能和CFRP制备成型工艺相匹配;当DEAD含量为5wt%、愈合温度/愈合时间(T/t)为150℃/30 min时,CFRP在100%L一次弯曲损伤自愈合效率达到了93.5%,比自愈合剂中无DEAD的提高了12.0%;在加载位移分别为100%L、90%L和80%L的弯曲载荷下,经过三次损伤修复,其自愈合效率依然达到了71.2%、70.2%、84.0%,表明经过多次损伤后,复合材料仍然具备自愈合能力。
An ultrathin core-shell nanofiber mats were prepared by encapsulating a mixture of the foaming agent diethyl azodicarboxylate(DEAD) and epoxy resin(EP) into polyacrylonitrile(PAN) nanofibers by coaxial electrostatic spinning technique and laying them on the interface of carbon fiber fabric, and forming CFRP with ultrathin self-healing smart sandwich after resin injection and curing. The self-healing effect of the ultrathin self-healing smart sandwich on the bending strength of CFRP laminates with damage failure was evaluated using a three-point bending test. The results showed that the thermal properties of PAN core-shell nanofibers and its encapsulated self-healing agent matched with the CFRP preparation and molding process. When the DEAD content was 5 wt% and the healing temperature/healing time(T/t) was 150 ℃/30 min, the self-healing efficiency of CFRP reached 93.5% at 100%L primary bending damage, which was improved by 12.0% compared with that without DEAD in the self-healing agent. Under the bending load with loading displacement of 100%L, 90%L and 80%L, respectively, the self-healing efficiency still reached 71.2%, 70.2% and 84.0% after three damage repairs, indicating that the composite still has self-healing ability after multiple damages.
作者
肖红波
毛驰
王洪伟
甘雨
XIAO Hong-bo;MAO Chi;WANG Hong-wei;GAN Yu(School of Intelligent Manufacturing,Wuhan Transportation Vocational College,Wuhan 430065,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《复合材料科学与工程》
CAS
北大核心
2022年第12期108-115,共8页
Composites Science and Engineering
基金
中央高校基本科研业务费专项资金资助(2019Ⅲ070GX)。
关键词
复合材料
核壳纳米纤维
自增压
自愈合
多次愈合
composite materials
core-shell nanofibers
self-pressurization
self-healing
multiple healing
