Cescato Roberto, Rigotti Daniele, Mahmood Haroon, Dorigato Andrea, Pegoretti Alessandro
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
National Interuniversity Consortium of Materials Science and Technology (INSTM), Via Giusti 9, 50121 Florence, Italy.
Polymers (Basel). 2021 Aug 14;13(16):2723. doi: 10.3390/polym13162723.
For the first time, a porous mesh of poly(ε-caprolactone) (PCL) was electrospun directly onto carbon fiber (CF) plies and used to develop novel structural epoxy (EP) composites with electro-activated self-healing properties. Three samples, i.e., the neat EP/CF composite and two laminates containing a limited amount of PCL (i.e., 5 wt.% and 10 wt.%), were prepared and characterized from a microstructural and thermo-mechanical point of view. The introduction of the PCL mesh led to a reduction in the flexural stress at break (by 17%), of the interlaminar shear strength (by 15%), and of the interlaminar shear strength (by 39%). The interlaminar fracture toughness of the prepared laminates was evaluated under mode I, and broken samples were thermally mended at 80 °C (i.e., above the melting temperature of PCL) by resistive heating generated by a current flow within the samples through Joule's effect. It was demonstrated that, thanks to the presence of the electrospun PCL mesh, the laminate with a PCL of 10 wt.% showed healing efficiency values up to 31%.
首次将聚（ε-己内酯）（PCL）多孔网直接静电纺丝到碳纤维（CF）层上，并用于开发具有电激活自修复性能的新型结构环氧（EP）复合材料。制备了三个样品，即纯EP/CF复合材料以及两种含有少量PCL（即5 wt.%和10 wt.%）的层压板，并从微观结构和热机械角度对其进行了表征。PCL网的引入导致断裂时的弯曲应力降低了17%，层间剪切强度降低了15%，层间剪切强度降低了39%。在I型模式下评估了制备的层压板的层间断裂韧性，断裂的样品通过样品内电流通过焦耳效应产生的电阻加热在80°C（即高于PCL的熔点）下进行热修复。结果表明，由于存在静电纺PCL网，含有10 wt.% PCL的层压板显示出高达31%的愈合效率值。
