Adhesive strength of steel–epoxy composite joints bonded with structural acrylic adhesives filled with silica nanoparticles

Abstract

This paper reports a study on the effect of silica nanoparticles on the adhesion strength of steel-glass/epoxy composite joints bonded with two-part structural acrylic adhesives. The introduction of nano-silica in the two-part acrylic adhesive led to a remarkable enhancement in the shear and tensile strength of the composite joints. The shear and tensile strengths of the adhesive joints increased with addition of the filler content up to 1.5 wt%, after which decreased with addition of more filler content. Also, addition of nanoparticles caused a reduction in the peel strength of the joints. Differential scanning calorimeter analysis revealed that T g values of the adhesives rose with increasing the nanofiller content. The equilibrium water contact angle was decreased for adhesives containing nanoparticles. Scanning electron microscope micrographs revealed that addition of nanoparticles altered the fracture morphology from smooth to rough fracture surfaces.

Durable nanocomposite adhesives based on polyacrylates and surface-modified colloidal silica

“…[1,2] A number of attempts have been made to overcome the problems, which include the copolymerization of various acrylic monomers, however, causing another problems such as lower peel strength and harder handling. [3,4] Therefore, there is a strong need to develop durable nanocomposite adhesives keeping good adhesiveness.…”

Epoxy‐based composite adhesives with improved lap shear strengths at high temperatures for steel‐steel bonded joints

“…The adhesively bonded strength depends on load, chemical properties between adhered surface and adhesive, and curing time. [1,2] Epoxy resins are commonly employed as engineering adhesives due to their good mechanical properties, good thermal stability, strong adhesion strength, broad chemical resistance, and efficient stress transfer between the substrate and bonded components. [3,4] In addition, ambient temperature-cure epoxy structural adhesives have been increasingly demanded in structural applications.…”

“…[22,23] Silica nanoparticles enhanced adhesion strength of steel-glass/ epoxy composite joints bonded with nanocomposite adhesives due to good stress transfer between nanoparticles and the polymer matrix. [2] Silica particles also possessed good interfacial interactions with the organic polymer matrix, resulting in the reduced free volume and increased glass transition temperatures. [24] In addition, silica particles could be employed for improving thermal stability of epoxy composites as observed in silica nanoparticle-filled DGEBA/cashew nut shell liquid copolymers.…”

Nano Clay Additive Effect on Shear Strength of GFRP Joints

“…It offers promising developments in its characteristics [3]. Nanoparticles exhibiting many unique mechanical properties have become one of the most attractive options in recent years to increase the strength of polymer materials and adhesives [4,5]. In this regard, studies were made on the performance of adhesive bonds by adding many different nanoparticles such as aluminum oxide [6,7] titanium oxide [8], Nano-graphite [9], carbon nanotube [10] and Nano-clay [11].…”