Morphological, mechanical, and electromagnetic interference shielding effectiveness characteristics of glass fiber/epoxy resin/MWCNT buckypaper composites

Abstract

Glass fiber/epoxy resin composites (GF/EP) using one and three multi-walled carbon nanotube buckypapers (BP) were obtained and their complex parameters, reflectivity, and electromagnetic interference (EMI) shielding effectiveness (SE) at X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz) were evaluated. The preparation of BP used polyacrylonitrile (PAN) nanofibers (PF These composites show both large storage and energy loss capacity in both bands revealing promising results related to EMI SE applications. Besides, a high attenuation of around 67% and 72% were achieved for BP based composites. The cross-section view of the buckypaper and the laminates was analyzed by scanning electron microscopy (SEM). The incorporation of the CNT film into the laminates showed no improvements in the elastic properties through dynamic mechanical analyses (DMA). Nevertheless, a decrease in the shear properties by the compression shear test (CST) and interlaminar shear strength (ILSS) has been observed. GF/EP/BP/PF composite presented a reduction of 29 and 39% in its ILSS properties compared to the base laminate (GF/EP). Also, the decrease was even more significant, revealing a steep reduction in its CST properties. On the other hand, the removal of the pan nanofiber (PF) led to better mechanical properties for GF/EP/BP/RPF composites. Results have shown ILSS values of 47.4 ± 2.2 MPa which are close to the base laminate (52.4 ± 3.1 MPa). The removal of the PF provided larger porous in the CNT network, making the impregnation by epoxy easier in the BP/RPF which resulted in improved shear properties compared to GF/EP/BP/PF samples. K E Y W O R D S composites, graphene, and fullerenes, mechanical properties, nanotubes, thermosets 1 | INTRODUCTION Nowadays, materials with properties of reflectivity and electromagnetic interference (EMI) shielding effectiveness (SE) have attracted intensive attention in aerospace, engineering, and telecommunication areas, all with civil and military applications. 1-6 Carbon nanomaterials such as carbon nanotubes (CNT), carbon nanofibers, graphite nanoplatelets, and carbon black 3,7-12 are good candidates for developing composites that attend the technological

Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films

“…In addition, the average failure load of the PAN-modified laminates increased, but the modulus did not change. The ILSS value increased by 5.4%, an increase from 88.3 to 93.1 MPa (see Figure 8 c,d), which was quite different from the observations reported in the literature [ 41 ] that PAN nanofiber films would reduce the interlaminar shear strength of the composite. Compared with the G IIC test, the improvement in the ILSS value was insignificant.…”

Ultrathin and flexible hybrid films decorated by copper nanoparticles with a sandwich-like structure for electromagnetic interference shielding

“…[18][19][20] Due to the formation of a three-dimensional network of CNTs, CNT films with excellent mechanical strength and electrical conductivity have shown promising potential for the next generation of electromagnetic shielding materials. [20][21][22][23] Combining the benefits of copper and CNT films, introducing copper nanoparticles into the CNT film is deemed as one of the most facile and feasible ways to increase the EMI SE and maintain the flexibility and light weight synchronously. 24,25 According to the mechanism of EMI shielding, the absorption and reflection of the incident electromagnetic waves are the main ways to achieve excellent EMI SE.…”

“…18–20 Due to the formation of a three-dimensional network of CNTs, CNT films with excellent mechanical strength and electrical conductivity have shown promising potential for the next generation of electromagnetic shielding materials. 20–23…”