Ali Alamry, Andriyana Andri, Hassan Shukur Bin Abu, Ang Bee Chin
Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur 50603, Malaysia.
Center of Advanced Materials, Faculty of Engineering, Universiti Malaya, Kuala Lumpur 50603, Malaysia.
Polymers (Basel). 2021 Apr 29;13(9):1437. doi: 10.3390/polym13091437.
The development of advanced composite materials has taken center stage because of its advantages over traditional materials. Recently, carbon-based advanced additives have shown promising results in the development of advanced polymer composites. The inter- and intra-laminar fracture toughness in modes I and II, along with the thermal and electrical conductivities, were investigated. The HMWCNTs/epoxy composite was prepared using a multi-dispersion method, followed by uniform coating at the mid-layers of the CF/E prepregs interface using the spray coating technique. Analysis methods, such as double cantilever beam (DCB) and end notched flexure (ENF) tests, were carried out to study the mode I and II fracture toughness. The surface morphology of the composite was analyzed using field emission scanning electron microscopy (FESEM). The DCB test showed that the fracture toughness of the 0.2 wt.% and 0.4 wt.% HMWCNT composite laminates was improved by 39.15% and 115.05%, respectively, compared with the control sample. Furthermore, the ENF test showed that the mode II interlaminar fracture toughness for the composite laminate increased by 50.88% and 190%, respectively. The FESEM morphology results confirmed the HMWCNTs bridging at the fracture zones of the CF/E composite and the improved interlaminar fracture toughness. The thermogravimetric analysis (TGA) results demonstrated a strong intermolecular bonding between the epoxy and HMWCNTs, resulting in an improved thermal stability. Moreover, the differential scanning calorimetry (DSC) results confirmed that the addition of HMWCNT shifted the to a higher temperature. An electrical conductivity study demonstrated that a higher CNT concentration in the composite laminate resulted in a higher conductivity improvement. This study confirmed that the demonstrated dispersion technique could create composite laminates with a strong interfacial bond interaction between the epoxy and HMWCNT, and thus improve their properties.
先进复合材料的发展因其相较于传统材料的优势而占据了核心地位。近来，碳基先进添加剂在先进聚合物复合材料的发展中展现出了令人期待的成果。研究了I型和II型层间及层内断裂韧性，以及热导率和电导率。采用多分散方法制备了HMWCNTs/环氧树脂复合材料，随后使用喷涂技术在CF/E预浸料界面的中间层进行均匀涂覆。通过双悬臂梁（DCB）和端部切口弯曲（ENF）试验等分析方法来研究I型和II型断裂韧性。使用场发射扫描电子显微镜（FESEM）分析复合材料的表面形态。DCB试验表明，与对照样品相比，0.2 wt.%和0.4 wt.% HMWCNT复合层压板的断裂韧性分别提高了39.15%和115.05%。此外，ENF试验表明，复合层压板的II型层间断裂韧性分别提高了50.88%和190%。FESEM形态学结果证实了HMWCNTs在CF/E复合材料的断裂区域桥接以及层间断裂韧性得到改善。热重分析（TGA）结果表明环氧树脂与HMWCNTs之间存在强分子间键合，从而提高了热稳定性。此外，差示扫描量热法（DSC）结果证实，HMWCNT的添加使转变温度升高。电导率研究表明，复合层压板中较高的CNT浓度导致更高的电导率提升。该研究证实，所展示的分散技术能够制备出环氧树脂与HMWCNT之间具有强界面键相互作用的复合层压板，从而改善其性能。
