Industrial cutting waste granite dust reinforced cardanol benzoxazine/epoxy resin hybrid composites for high‐voltage electrical insulation applications

Abstract

An attempt has been made to develop hybrid composites from benzoxazine monomer (C‐ddm) hybridized with DGEBA epoxy resin (EP) and reinforced with varying weight percentages (20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt%) of glycidoxypropyltrimethoxy‐ silane (GPTMS) functionalized granite dust (GD) obtained from industrial granite cutting and polishing process in order to utilize them for electrical insulation applications. The thermal stability of granite dust reinforced poly(EP‐co‐C‐ddm) composites was studied by TGA analysis. Among the composites samples studied, 100 wt% GD reinforced poly(EP‐co‐C‐ddm) composites possess better thermal stability than that of other neat matrices and composites. Among the composites prepared using varying weight percentages of functionalized GD reinforcement, it was observed that 80 wt% GD reinforced poly(EP‐co‐C‐ddm) composites possesses better hydrophobic character than that of other neat matrices and composites. The value of LOI calculated for neat matrix (poly[EP‐co‐C‐ddm]) and 20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt% GD reinforced composites was found to be 22, 28, 34, 40, 43 and 45 respectively. The 80 wt% GD reinforced poly(EP‐co‐C‐ddm) composites possess the higher values of tensile strength and flexural strength of 47 MPa and 140 MPa, respectively than those of their samples. The values of electrical surface resistivity and electrical volume resistivity of all the neat matrices and GD reinforced polybenzoxazine composites were found to be in the order of 1012 and 1013 respectively. The values of dielectric strength obtained from break down voltage (BDV) for neat matrix [poly(EP‐co‐C‐ddm)] and 20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt% of GD reinforced poly(EP‐co‐C‐ddm) composites are 15.0, 15.5, 16.5, 17.0, 17.0 and 17.0 kV/mm, respectively. Data obtained from thermal stability, hydrophobic behavior and dielectric studies it was inferred that the hybrid polymer composites developed in the present work can be conveniently used in the form insulators, sealants, adhesives and matrices where application demands at high‐performance industrial and engineering applications.

Boron doped graphitic carbon nitride (BN‐g‐C3N4) and palm flower ash reinforced pyrimidinone core‐based polybenzoxazine composites for low‐k and high‐k applications

“…14 In addition, recently our research group developed bio-silica, natural fibers, granite dust reinforced benzoxazine composites for different engineering applications. [15][16][17][18][19][20] Rana et al studied the thermodynamical compatibility of blends, miscibility of solvent-cast blends varies greatly from solvent to solvent, cloud-point, phase diagrams and the homogeneity between the blends was discussed in terms of negative heat of mixing and positive heat of mixing. They also fabricated the flow calorimetry to measure the enthalpies of mixing of polymer blends.…”

“…Vaithilingam et al studied the corrosion resistant efficiency of cashew nut shell reinforced thiourea based biophenolic benzoxazine‐epoxy blend 14 . In addition, recently our research group developed bio‐silica, natural fibers, granite dust reinforced benzoxazine composites for different engineering applications 15–20 . Rana et al studied the thermodynamical compatibility of blends, miscibility of solvent‐cast blends varies greatly from solvent to solvent, cloud‐point, phase diagrams and the homogeneity between the blends was discussed in terms of negative heat of mixing and positive heat of mixing.…”