Facile preparation and properties of polybenzoxazine/graphene porous nanocomposites for electromagnetic wave absorption

Abstract

Polybenzoxazine/graphene porous nanocomposites were prepared by sol–gel and subsequent thermal curing. The porous nanocomposites showed low densities ranging from 0.154 to 0.204 g/cm3. The chemical structures and microscopic morphology of the porous nanocomposites were studied using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The electromagnetic wave absorbing ability of the porous nanocomposites was investigated, and the results showed that the minimum reflection loss for the porous nanocomposite with 15 wt% of graphene (PBG‐15) can reach −35.72 dB at a thickness of 2.6 mm with a 1.5 GHz frequency bandwidth. The excellent absorption ability was due to the conductivity loss in the porous nanocomposite. Also, PBG‐15 exhibited good heat resistance with a thermal deformation temperature near 220°C and a char yield of 56%. In addition, the addition of graphene could increase the compressive strength and compressive modulus of the porous nanocomposites by up to 126% and 364%, respectively. These polybenzoxazine/graphene porous nanocomposites have good potential application in light electromagnetic wave absorbing materials.

The effect of nanocarbon inclusion on mechanical, tribological, and thermal properties of phenolic resin‐based composites: An overview

“…Recently, Xu and coworkers found substantial improvements in the properties of Polybenzoxazine/graphene nanocomposites such as compressive strength, modulus, and char yield. 132 Furthermore, in addition to above reviewed works, Table 4 exclusively display some of the work output where significant enhancement in mechanical strength properties including an approximate tensile strength and young's modulus observed with the incorporation of various carbon nanomaterials in phenolic based composites. In Table 4 the term "Nanocarbon modifier (wt%)" is representing the type of nanocarbon derivative constituents in weight percentage included to the phenolic resin composite in order to modify mechanical properties.…”

Ring Opening Polymerization Used for the Production of VOC Free High-Performance Ecofriendly Novel PBZ/PDA/CeO2 Nanocomposites

“…The active and homogeneous distribution of NPs is quite an impenetrable topic for scientists, which is importantly prejudiced by the intra-particle connections. Therefore, surface modifiers have been used to prevent this problem, placing them in a layer around the nanoparticle [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Synthesis of a Novel Bifunctional Epoxy Double-Decker Silsesquioxane: Improvement of the Thermal Stability and Dielectric Properties of Polybenzoxazine

“…In addition, polybenzoxazine thermosets can be used as a microelectronic packaging material, further reducing the dielectric constant, and loss of benzoxazine resin is also the target of the researchers. Some reports have focused on mixing various inorganic compounds (e.g., clay [ 21 , 22 ], graphene [ 23 , 24 , 25 ], POSS [ 26 , 27 ]) with benzoxazine monomers to form organic–inorganic nanocomposites to improve the crosslinking density, the thermal stability of thermosets and reduce the dielectric constant.…”