Preda Nicoleta, Costas Andreea, Sbardella Francesca, Seghini Maria Carolina, Touchard Fabienne, Chocinski-Arnault Laurence, Tirillò Jacopo, Sarasini Fabrizio
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania.
Department of Chemical Engineering Materials Environment, Sapienza-Università di Roma & UdR INSTM, Via Eudossiana 18, 00184 Roma, Italy.
Nanomaterials (Basel). 2022 Aug 12;12(16):2765. doi: 10.3390/nano12162765.
Hierarchical functionalization of flax fibers with ZnO nanostructures was achieved by electroless deposition to improve the interfacial adhesion between the natural fibers and synthetic matrix in composite materials. The structural, morphological, thermal and wetting properties of the pristine and ZnO-coated flax fibers were investigated. Thus, the ZnO-coated flax fabric discloses an apparent contact angle of ~140° immediately after the placement of a water droplet on its surface. An assessment of the interfacial adhesion at the yarn scale was also carried out on the flax yarns coated with ZnO nanostructures. Thus, after the ZnO functionalization process, no significant degradation of the tensile properties of the flax yarns occurs. Furthermore, the single yarn fragmentation tests revealed a notable increase in the interfacial adhesion with an epoxy matrix, reductions of 36% and 9% in debonding and critical length values being measured compared to those of the pristine flax yarns, respectively. The analysis of the fracture morphology by scanning electron microscopy and X-ray microtomography highlighted the positive role of ZnO nanostructures in restraining debonding phenomena at the flax fibers/epoxy resin matrix interphase.
通过化学镀实现了用ZnO纳米结构对亚麻纤维进行分级功能化，以改善复合材料中天然纤维与合成基体之间的界面附着力。研究了原始亚麻纤维和涂覆ZnO的亚麻纤维的结构、形态、热性能和润湿性。因此，在水滴放置在其表面后，涂覆ZnO的亚麻织物立即显示出约140°的表观接触角。还对涂覆有ZnO纳米结构的亚麻纱线进行了纱线尺度上的界面附着力评估。因此，在ZnO功能化过程之后，亚麻纱线的拉伸性能没有明显下降。此外，单纱断裂试验表明与环氧基体的界面附着力显著增加，与原始亚麻纱线相比，测得的脱粘和临界长度值分别降低了36%和9%。通过扫描电子显微镜和X射线显微断层摄影术对断裂形态的分析突出了ZnO纳米结构在抑制亚麻纤维/环氧树脂基体界面处脱粘现象方面的积极作用。
