Thermal stability and adhesive strength of boron nitride nano platelets and carbon nano tube modified adhesives

Abstract

The effect of multi-walled carbon nanotube and/or boron nitride nano platelets usage on shear strength and thermal stability of epoxy based adhesives have been investigated. Commercially available diglycidyl ether of bisphenol A based epoxy was used as matrix and reinforced by using nanofillers. The resulting adhesive was tested for its shear-lap adhesion to aluminum alloy sheets (2024-T3). The nano particles modified epoxy adhesives were characterized by Fourier transform infrared, differential scanning calorimetry, and thermal gravity analyses analysis. These characterizations revealed that incorporation of nano particles can result in enhancement in chemical stability. Single lap strength joint testing was conducted in accordance with ASTM-D-1002-10 standard. Fracture morphologies and the effects of multi-walled carbon nanotubes and boron nitride nano platelets on epoxy adhesive were investigated after shear tests by means of scanning electron microscopy. Compared to neat epoxy, increases of 30% in shear strength and 57% in energy required to break joints have been obtained by multi-walled carbon nanotube/boron nitride nano platelet modification.

Enhanced thermal conductivity and mechanical properties of polymeric composites through formation of covalent bonds between boron nitride and rubber chains

“…20 As a result, some studies have modified the surface of BN in an effort to improve the dispersion and decrease the surface thermal resistance of polymeric composites. 21,22 For instance, Ryu et al 23 modified BN platelets by 3-aminopropyl triethoxysilane (KH550) (BN-KH550) to enhance the thermal conductivities of polyethylene naphthalate (PEN) composites. Their data showed the λ value of PEN composite filled with 50 wt% BN-KH550 platelets reached 1.63 W/mK, a value of 16% higher than that of 50 wt% BN/PEN composite (1.41 W/mK).…”

“…Organic rhodanine (Rd) is a rubber-curing accelerator derived from thiazolidine. The large amounts of accepting structure (N C═S) in Rd, which can tautomerize to yield N═thiazolidine, 22 could allow rapid Rd reaction with sulfur and transformation into inactive crosslinking precursors. 26 Some recent studies have suggested that Rd may undergo self-polymerization to form polyrhodanine (PRd) shells on nanoparticles, thereby producing core-shell structured nanoparticles.…”

Study of the synergistic effect of boron nitride and carbon nanotubes in the improvement of thermal conductivity of epoxy composites

“…Similar results were described by Ulus et al . where small proportions of CNTs result in better mechanical behaviour than when increasing the concentration of nanofillers . On increasing the CNT content, the viscosity of the formulation becomes higher and the possibility of the formation of agglomerates increases, which influences the processing and the final properties .…”

Mechanical Properties and Damage Behaviours of Polyurethane Composites Reinforced With BNNP and MWCNT Hybrid Nanoparticles

“…Hybrid PU composites are used in the literature because of improved properties such as bridging the gap, crack blunting, crack propagation and arrest, thermal and electrical conductivity. [25][26][27][28] In this study, 0.5% by weight Boron Nitride Nanoplates (BNNP) and/or 0.25%, 0.35, and 0.45% by weight Multi-walled Carbon Nanotubes (MWCNT) reinforced polyurethane (PU) nanocomposites were mixed by solution casting method, and according to ASTM D638-10 and ASTM D790-02 tensile and flexure, specimens were produced.…”

“…Hybrid PU composites are used in the literature because of improved properties such as bridging the gap, crack blunting, crack propagation and arrest, thermal and electrical conductivity. 25-28…”