Petousis Markos, Tzounis Lazaros, Papageorgiou Dimitrios, Vidakis Nectarios
Mechanical Engineering Department, Hellenic Mediterranean University, Estavromenos, 71004 Heraklion, Crete, Greece.
Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece.
Nanomaterials (Basel). 2020 Dec 13;10(12):2500. doi: 10.3390/nano10122500.
We report on a versatile method for chemically grafting multiwalled carbon nanotubes (MWCNTs) onto the surface of conventional glass fibers (GFs), as well as depositing further silica (SiO) or superparamagnetic (SPM) magnetite (FeO) nanoparticles (NPs) creating novel hierarchical reinforcements. The CNT-grafted GFs (GF-CNT) were utilized further as the support to decorate nano-sized SiO or FeO via electrostatic interactions, resulting finally into double hierarchy reinforcements. SiO NPs were first used as model nano-particulate objects to investigate the interfacial adhesion properties of binary coated GFs (denoted as GF-CNT/SiO) in epoxy matrix via single fiber pull-out (SFPO) tests. The results indicated that the apparent interfacial shear strength (IFSS or ) was significantly increased compared to the GF-CNT. FeO NPs were assembled also onto CNT-grafted GFs resulting into GF-CNT/FeO. The fibers exhibited a magnetic response upon being exposed to an external magnet. Scanning electron microscopy (SEM) revealed the surface morphologies of the different hierarchical fibers fabricated in this work. The interphase microstructure of GF-CNT and GF-CNT/SiO embedded in epoxy was investigated by transmission electron microscopy (TEM). The hybrid and hierarchical GFs are promising multifunctional reinforcements with appr. 85% increase of the IFSS as compared to typical amino-silane modified GFs. It could be envisaged that, among other purposes, GF-CNT/FeO could be potentially recyclable reinforcements, especially when embedded in thermoplastic polymer matrices.
我们报道了一种通用方法，可将多壁碳纳米管（MWCNT）化学接枝到传统玻璃纤维（GF）表面，并进一步沉积二氧化硅（SiO）或超顺磁性（SPM）磁铁矿（Fe₃O₄）纳米颗粒（NP），从而创建新型分级增强材料。接枝了碳纳米管的玻璃纤维（GF-CNT）进一步用作载体，通过静电相互作用来修饰纳米级的SiO或Fe₃O₄，最终形成双重分级增强材料。首先将SiO纳米颗粒用作模型纳米颗粒物体，通过单纤维拔出（SFPO）试验研究二元涂层玻璃纤维（表示为GF-CNT/SiO）在环氧树脂基体中的界面粘附性能。结果表明，与GF-CNT相比，表观界面剪切强度（IFSS或τ）显著提高。Fe₃O₄纳米颗粒也组装到接枝了碳纳米管的玻璃纤维上，形成GF-CNT/Fe₃O₄。这些纤维在暴露于外部磁铁时表现出磁响应。扫描电子显微镜（SEM）揭示了这项工作中制备的不同分级纤维的表面形态。通过透射电子显微镜（TEM）研究了嵌入环氧树脂中的GF-CNT和GF-CNT/SiO的界面微观结构。与典型的氨基硅烷改性玻璃纤维相比，这种混合和分级玻璃纤维是有前景的多功能增强材料，其IFSS提高了约85%。可以设想，除其他用途外，GF-CNT/Fe₃O₄可能是潜在的可回收增强材料，特别是当嵌入热塑性聚合物基体中时。
