Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

Abstract

Epoxy composites filled with 0.5 wt% of multi-walled carbon nanotubes (MWCNTs), 10 and 15 wt% of boric acid and sodium bicarbonate separately, as well as composites filled with a combination of MWCNTs-boric acid and MWCNTs-sodium bicarbonate were prepared. The thermal behavior of the prepared samples was investigated under heating in oxidative environment using thermogravimetric analysis. The hardness was measured using the Shore D hardness test. To evaluate the flammability of the samples, the ignition temperature and time-to-ignition were determined. It was concluded that sodium bicarbonate in the studied concentrations (10 and 15 wt%) is not appropriate for use as a filler capable of improving the thermooxidative stability and reducing the flammability of epoxy polymers. The improvement in the thermal properties can be achieved by using the combination of boric acid and multi-walled carbon nanotubes as fillers. The thermooxidative destruction of the samples filled with boric acid passes more slowly and more evenly via the formation of B2O3 as a result of its decomposition.

Fabrication of BA-doped ER-based microfluidics using CO 2 laser ablation: an impact of doping ER with boric acid

“…Regarding transparency, as a very important criterion in choosing a material for micro uidics platforms 16 , the incorporation of boric acid powder has led to the formation of pale-yellow color, and the cured epoxy resin lost its transparency, as reported in many previous research works 7,17 . The obtained opacity for boric acid-loaded cured epoxy resin makes it inappropriate for micro uidic devices.…”

“…Epoxy resins are extensively used in industry as construction materials, coatings, adhesives, and matrices for advanced composites because of their superior mechanical and chemical resistance, electrical properties, and resistance to moisture 7 . Epoxy resin readily available in the marketplace has several crucial characteristics that make it a strong candidate for use in micro uidics, including a high Young's modulus, high optical transparency, autoclavability, hydrophobicity, negligible migration, ease of handling, and low cost 8 .…”

Tailoring thermal and thermomechanical properties of biobased blends by hybridization of difuran benzoxazine with polysiloxane‐based benzoxazine and epoxy monomers

“…They exhibit good mechanical and electrical properties, chemical and moisture resistance. [1][2][3] However, epoxy-based materials present some drawbacks, such as high flammability and fire hazard. 3 As an alternative, in the last decades, polybenzozaxines have gained prominence as high performance thermosetting resins.…”

“…Epoxy resins are one of the most important thermosetting resins employed in many applications, including both commodity materials and high‐technology products of aerospace and aeronautic industries. They exhibit good mechanical and electrical properties, chemical and moisture resistance 1–3 . However, epoxy‐based materials present some drawbacks, such as high flammability and fire hazard 3 .…”

Effects of Phosphorus and Boron Compounds on Thermal Stability and Flame Retardancy Properties of Epoxy Composites

“…The water released during its decomposition reduces the temperature and can dilute the combustible gases in the combustion zone. At higher temperatures, H 3 BO 3 is converted to boric trioxide (B 2 O 3 ) [ 34 , 35 ] which can form a glassy film on the burning surface of the polymer, thus inhibiting the diffusion of flammable gases in the combustion zone and reducing the flame spread on the polymer surface [ 36 , 37 ].…”