Enhancing surface insulation of glass fiber reinforced polymer composites by plasma fluorinating glass fiber

Abstract

Glass fiber reinforced polymer (GFRP) is a widely used composite material in industrial production. In this article, glass fiber (GF) was fluorinated by dielectric barrier discharge (DBD), and the GFRP composites made of GF with different fluorination time and various numbers of fluorinated GF layers were prepared to improve the surface insulation property. The effect of plasma fluorination on GF was analyzed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), including the surface morphology and chemical composition. In addition, the surface electrical properties of the above composites were investigated experimentally. The results show that the flashover voltage of modified GFRP is 29.84% higher than that of the original sample. By analyzing the charge dissipation and trap, it is inferred that plasma fluorination can raise the trap energy level of the composites, therefore suppressing the carrier migration on the surface and increasing the flashover voltage. Furthermore, the internal structure of composites can be improved by increasing the number of fluorinated GF layers, which accelerates the charge dissipation along the body, thus enhancing the surface insulation properties of the composites in both ways.

Glass fiber/epoxy composites with improved interfacial adhesion by using cross‐linking sizing agent

“…The peak at 916 cm −1 gradually disappeared, indicating epoxy groups were reacted with the increased amount of PEI. The chemical compositions of GFs were further determined by C1s XPS and the outcomes are displayed in Figure 1C–F and surface elements analysis of GF samples are presented in Table S1 34,35 . The peaks at 284.5, 286.3 and 288.7 eV had been ascribed to CC, CO, and CO bonds 36 .…”

“…The chemical compositions of GFs were further determined by C1s XPS and the outcomes are displayed in Figure 1C-F and surface elements analysis of GF samples are presented in Table S1. 34,35 The peaks at 284.5, 286.3 and 288.7 eV had been ascribed to C C, C O, and C O bonds. 36 After the treatment of GFs with cross-linking modified sizing agent, the C1s spectra of GF-1, GF-6, and GF-12 showed characteristic peak at 285.4 eV (C N), 37,38 which indicated the successful introduction of PEI.…”

Study on interface insulation properties of Al2O3 epoxy composites using plasma jet‐fluorinated etching/SiOx deposition

“…The elemental F content on the surface of the fluorinated Al 2 O 3 /EP samples increased significantly, up to 12.38%. The C1s peaks of the untreated Al 2 O 3 /EP, APPJ‐F‐3, and APPJ‐F‐5 were split, as shown in Figure 5(A)~(C), to study the presence form of the F element created on the surface of the Al 2 O 3 /EP 27 . It was found that the C1s peaks of the untreated Al 2 O 3 /EP could be divided into three peaks, while the C1s peaks could be divided into more peaks after plasma fluorination, and the peaks of each peak were not the same.…”

Analysis of ducted fan warpage based on the response surface methodology and a genetic algorithm

“…Glass fiber‐reinforced polymers are composite materials widely used in industrial production. [ 17 ] Ghanbari et al found that including glass fibers (GF) at 23°C significantly improved the heat distortion temperature (HDT), flexural modulus, and tensile strength of the material. [ 18 ] Similarly, Zhao et al observed considerable enhancement of the mechanical properties of the composite as the content of high‐performance glass fibers increased, especially when four bundles of GF were added, with a nylon56/GF composite reaching a tensile strength of 160 MPa, which was 86.9% higher than that of nylon56.…”