New Synthetic Approach of Fluorine-Containing Graphene Oxide for Improving Dielectric and Mechanical Properties of Polyimide Composites

Abstract

A new approach to synthesize fluorine-containing graphene oxide (FCGO) was proposed, in which a less toxic reagent was used rather than fluorine gas or anhydrous hydrogen fluoride. The dielectric and mechanical properties of polyimide composites were improved by incorporating a small amount of FCGO. FCGO served as not only nanofiller to lower the dielectric constant of PI films but also inorganic toughening particles to improve the toughness of PI films. The dielectric constant of PI films with 0.6 wt % FCGO was decreased from 3.33 for pure PI to 2.34. In addition, both the tensile strength and Young's modulus of PI films with 0.6 wt % FCGO were increased to 141 MPa and 4.95 GPa from 118 MPa and 2.81 GPa for pure PI, respectively. In addition, its tensile energy to break was enhanced to 31.6 MJ/m 3 from 20.8 MJ/m 3 .

Fabrication of PVDF/graphene composites with enhanced β phase via conventional melt processing assisted by solid state shear milling technology

“…To meet the application requirements for electronic products, some llers with excellent electrochemical properties, such as graphene (GP), [9][10][11][12] carbon nanotube, 13,14 ceramic (BaTiO 3 , PZT), [15][16][17] metal (Au, Cu), 18,19 metal oxide (ZnO), 20,21 had been chosen and added into PVDF matrix, and PVDF based composites with relatively higher dielectric constant were achieved. Among these llers, GP, a new type of twodimensional carbon nanomaterial with superior mechanical properties, high efficiency electron transfer capability and high thermal conductivity, 22,23 has been of interests recent years.…”

Epoxy resin composites with commercially available graphene: toward high toughness and rigidity

“…As shown in Fig. 4, in addition to the G peak around 1580 cm À1 ascribed to the sp 2 hybridized carbon atom, the Raman spectrum of CG has an emerging D peak around 1300 cm À1 originated from the disordered edge region of graphene-based materials, 23 which means that defect sites are introduced into CG during the mass production. From the Raman spectrum of ATCG, the intensity of D peak is slightly higher than that of CG, and the I D /I G value of ATCG is only increased to 0.97 from 0.92 of CG, implying that few defects are introduced into graphene nanosheets through acid soaking technique.…”

Thermal decomposition of polyimides containing phosphine-oxide units

“…Depending on their structural characteristics such polyimides may be successfully used in different industrial segments. They have an important role in high technology applications such as aerospace, automotive, chemical and electronic industry [9][10][11][12][13].…”