Influence of Nanoclay on the Morphology, Adhesive and Mechanical Properties of Polysulfide Modified Epoxy Resin

Abstract

Addition of nanoclay particles to a typical tertiary amine cured polysulfide modified epoxy adhesive leads to large increase in the single-lap shear strength of aluminum-aluminum joint. The nanoclay particles are very well dispersed (near fully exfoliated) in the polymer matrix even at 8 wt.% of nanoclay concentration. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies provide evidences for the excellent dispersion of the nanoclay platelets in the polymer matrix. The addition of nanoclay particle results in a significant increase in the elongation at break values along with the marginal increase in the tensile strength. The nanoclay provides good ductility to the epoxy-polysulfide adhesive by forming very flexible interface, which leads to less brittle composite having good strength. The increase in work to break (Wb) values by the addition of nanoclay represents the potential for dissipating a greater amount of energy during the bond rupture process of the lap shear test, and hence the adhesive strength increases. In addition, the increase in joint strength by the addition of nanoclay can also be attributed to the good interaction between the epoxy-polysulfide adhesive and the aluminum substrate in the presence of nanoclay.

Effect of functionalization of multi-walled carbon nanotube on mechanical and viscoelastic properties of polysulfide-modified epoxy nanocomposites

“…Marginal increase of tensile strength due to weak interfacial interaction in PS-modified epoxy nanocomposites were also reported by Bhowmick et al and Rahaman et al, respectively. 36,37 Nanoclay and nanosilica were used to toughen epoxy matrix in their research, since the interfacial interaction between hydroxyl group of the nanofiller and the matrix was not ideal, thus the improvement in tensile strength was unsatisfactory.…”

“…26,28,33 To achieve epoxy resin having excellent mechanical property without compromising other desired properties, researchers have developed hybrid PS/inorganic nanoparticle-reinforced epoxy compounds. [36][37][38] By utilizing the high elasticity of PS and high strength of inorganic nanoparticles, this hybrid reinforcing method is expected to provide epoxy resin with exceptional mechanical strength. However, the outcomes in the reported literature are not satisfactory.…”

“…Bhowmick et al reported that in a nanoclay/ PS-toughened epoxy resin, the tensile strength of composites increased marginally and T g even decreased with the increase in nanoclay concentration. 36 Rahaman et al studied on the effect of nanosilica particles on the mechanical properties of PS-toughened epoxy composites. They showed that by addition of nanosilica, the T g of the composites increased marginally and the tensile strength decreased except for 3 wt% loading.…”

Modifiye edilmiş ve edilmemiş Bor Karbür (B4C) nanopartiküllerinin yapısal yapıştırıcıların mekanik özellikleri üzerine etkisi

“…Literatürdeki çalışmalar incelendiğinde, grafen, karbon nanotüp (KNT), fulleren, kil, grafen oksit, Al2O3 gibi katkı maddelerinin epoksi matris içerisine eklenmesiyle epoksilerin fiziksel, termal ve mekanik özelliklerin iyileştiği görülmektedir [4][5][6][7][8][9][10][11][12][13]. Han vd.…”

Preparation and Properties Evaluation of an Epoxy Resin Toughened by a Combination of Reactive Polyester and Kaolin

“…Approaches to improve the mechanical properties of epoxy resins include the incorporation of solid particles [1][2][3][4][5] and butadiene-acrylonitrile copolymers terminated with reactive groups such as carboxyl, amine, hydroxyl or epoxy 1,[6][7][8][9][10][11][12][13] . It was found that the rubber which is in general soluble in the uncured epoxy resin, precipitates out from solution during the curing process, forming a fine and homogeneous dispersion of rubber particles.…”