Enhanced Epoxy/GO Composites Mechanical and Thermal Properties by Removing Air Bubbles with Shear Mixing and Ultrasonication

Abstract

Epoxy‐graphene oxide composites were prepared through the homogeneous dispersion of graphene oxide (GO) in epoxy via shear mixing and ultrasonication techniques. Mechanical and thermal properties of the composites were evaluated. Final composite samples were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, optical microscope, differential scanning calorimetry, thermogravimetric analysis, and x‐ray diffraction analyses. The thickness of the prepared GO sheet was calculated by atomic force microscopy. Herein, we report a remarkable enhancement in thermal along with mechanical properties of diglycidyl ether of bisphenol‐A (DGEBA) based epoxy matrix upon adding small amounts (≤1.5 wt%) of GO into the glassy epoxy system. With the incorporation of only 0.5 wt% GO the tensile strength and Young's modulus were found to be increased by 67.4% and 43.2%, respectively compared to neat epoxy; in addition, 3.7 folds improvement was achieved in the impact strength at the same GO content. In agreement with mechanical properties, resulting composites also showed better thermal stability together with promising improvement in glass transition temperature. The glass transition temperature was enhanced by 25.8 °C for the composite with 0.1 wt% GO. Therefore, the prepared composite will have potential applicability in the field of material science with improved mechanical and thermal response.

Surface modification of bamboo fiber with sodium hydroxide and graphene oxide in epoxy composites

“…[27,30] The use of GO and GO-derived graphene materials as a filler in polymer composites not only have increased the elastic modulus and tensile strength of the composites, but also added electrical conductivity and thermal stability, which creates the potential to produce a multifunctional composite. [29,[31][32][33] By adding 0.7 wt% GO in poly(vinyl alcohol) (PVA) an increase of 62% in Young's modulus and 76% in tensile strength were achieved due to efficient load transfer between the GO and the matrix. [34] Many studies have been reported on the coating of synthetic fibers with GO [35,36] to increase the composite performance, including the mechanical and interfacial properties.…”

Enhancing the Mechanical Properties of Waterborne Polyurethane Paint by Graphene Oxide for Wood Products

“…In the meantime, the elongation at the break of the tested paint films appears to display the opposite rule with the increasing dosage of GO. Excessive GO would impair the toughness of the composite paint films (Figure 4h), probably due to the promoted crystallinity of PU through enhancing the intermolecular forces and reducing the slip among the resin molecular chains [52]. The composite film of GO-WPU at 0.1 wt% shows benign elongation at break, with a slight decrease (1.7%) compared with the GO-free paint film.…”

Recent advances in energy storage with graphene oxide for supercapacitor technology

“…This stability allows GO-based SCs to maintain their performance over extended periods, making them a reliable energy storage solution. 76,77 Also, the mechanical properties of GO have been extensively studied, and it has been found to be structurally very stable and highly fracture-resistant. 78 Furthermore, GO is highly compatible with existing manufacturing techniques, enabling its integration into various electrode architectures.…”