Evaluation of fracture toughness of epoxy polymer composite incorporating micro/nano silica, rubber and CNTs

Abstract

In engineering applications, fracture toughness is an essential requirement that determines the life of a material. Epoxy polymers are widely used in fibre-reinforced composite materials. Due to their structural efficiency and durability, the use of adhesive and composite materials based on epoxy polymers is widespread in aerospace and automobile industries. In this paper fracture toughness of hybrid epoxy polymer composite with addition of nano/micro figures of silica, rubber and carbon nano tubes (CNTs) is evaluated. It is observed that silica addition promoted nano toughening effect with plastically deformation capability in epoxies. Rubber and multi walled CNTs increased the toughness with negligible reduction in stiffness in epoxies. Future research emphasis can be laid on crucial understanding of stress transfer mechanisms and interfacial bond strength between nano particles-epoxy system and on nanofillers modified epoxies as matrices or interleafs for carbon or glass fiber composites to increase the interlaminar delamination toughness.

Detailed Thermal, Fire, and Mechanical Study of Silicon-Modified Epoxy Resin Containing Humic Acid and Other Additives

“…The tensile properties of E, E12AP, E12AP_12HAURAPP, and E6AP_6HAURAPP samples were measured according to the ASTM D638 standard (Table ). It is well known that the formation of silicon-containing hybrid moieties can be considered an effective method for increasing the toughness of epoxies . The presence of hybrid epoxy chains in the polymer matrix slows down the kinetics of the energy dissipation mechanisms, as for example the crack growth occurring from filler debonding.…”

“…The presence of hybrid epoxy chains in the polymer matrix slows down the kinetics of the energy dissipation mechanisms, as for example the crack growth occurring from filler debonding. Thus, the incorporation of a hybrid epoxy network into neat epoxies promotes an increase of fracture toughness . Therefore, the E12AP sample, which was synthesized by following the first step of a sol–gel method already exploited by the authors in several similar systems, ,,, is characterized by uniformly distributed hybrid moieties that increase its fracture strength “σ B ” and elongation break “ε B ” compared to the E sample (Table ).…”

“…It is well known that the formation of siliconcontaining hybrid moieties can be considered an effective method for increasing the toughness of epoxies. 64 The presence of hybrid epoxy chains in the polymer matrix slows down the kinetics of the energy dissipation mechanisms, as for example the crack growth occurring from filler debonding. Thus, the incorporation of a hybrid epoxy network into neat epoxies promotes an increase of fracture toughness.…”

Avaliação do Comportamento Mecânico e de Cura da Resina Epóxi em Compósito Reforçado com Aramida/Vidro

“…Table 1 also shows the values of impact of the composites made with both the epoxy resin with storage time of 2 and 12 months. An increase in the percentage of crystallinity and reduction of the average molar mass of the epoxy resin provides a reduction in impact strength (Cozza, 2020), as noted in Table 1.…”

Preparation and properties of CNTs loaded bisphenol F epoxy nanocomposites modified by noncovalent dispersant and nonionic surfactant

“…In addition, with the rapid development of science and technology, people have put forward higher requirements for the strength, elastic modulus, and toughness of epoxy resin in many high‐tech fields. For example, epoxy resin used in aerospace, electronics, and electrical appliances and construction engineering fields will be required to have excellent toughness, adhesion, flame retardancy, moisture, and heat resistance and impact resistance 21–23 . This means that the modification of epoxy resin still needs to be explored by new methods.…”