اثر چارچوب فلز-آلي MIL-101(Cr) و چقرمه كننده بوتيل اكريلات- استايرن بر خواص مكانيكي و حرارتي چسب هاي كامپوزيتي بر پايه رزين اپوكسي

Effect of MIL-101(Cr) Metal-Organic Framework an‎d Butyl Acrylate-Styrene Toughener on Mechanical an‎d Thermal Properties of Composite Adhesives Based on Epoxy Resin

مهندسي شيمي

In this study, MIL-101 (Cr) an‎d NH2-MIL-101 (Cr) nanoparticles were synthesized by hydrothermal method. Butyl aCrylate-styrene copolymer was used along with these nanoparticles to improve the Toughness of epoxy adhesive. Adhesives were prepared in two ways, cured at ambient temperature an‎d high temperature, an‎d the required tests were performed on each of them. The results of the FTIR, XPS an‎d XRD tests showed that the synthesis of MOFs were successful. The mechanical properties of epoxy adhesive an‎d adhesion Strenght of Aluminum joints were investigated by tensile an‎d lap shear Strenght test. Tensile test results In ambient temperature adhesives showed that adding 0.3 Phr of NH2-MIL-101 (Cr) an‎d 2.5 Phr of Poly(butyl aCrylate-block-styrene) to the epoxy adhesive tensile strength, modulus an‎d toughness of dumbbell samples were increase compared to epoxy adhesive 36%, 20.27% an‎d 29.24% respectively. Furthermore, based on the lap shear Strenght test results, adding 0.3 Phr NH2-MILL-101 (Cr) to the epoxy adhesive increased the shear strength by 508.6% compared to the neat epoxy adhesive. According to TGA test, the highest thermal stability was related to the sample containing 0.3 Phr of NH2-MILL-101 nanoparticles an‎d 2.5 Phr of the block copolymer. Cross-section image of the fractured nanocomposite samples containing 0.3 Phr NH2-MILL-101 (Cr) an‎d 2.5 Phr block copolymer shows that the interface of nanoparticles an‎d the matrix improved due to the chemically reaction of functional groups of nanoparticles an‎d adhesive matrix. In high temperature paste adhesives, the results of tensile an‎d lap shear tests showed that by adding MIL-101 (Cr) an‎d NH2-MIL-101 (Cr) nanoparticles to the epoxy adhesive matrix, the toughness was 99 an‎d 145%, respectively, an‎d the shear strength has also inCreased by 24 an‎d 50 percent respectively. The results of the DSC test indicated the positive effect of nanoparticles on the curing kinetics of epoxy Adhesive.On the other han‎d, the thermogravimetric test results showed that the addition of nanoparticles significantly improved the thermal stability of the adhesive matrix. In addition, the FESEM test results were in agreement with the mechanical test results, an‎d the most important toughness mechanisms were Crack deflection, Crack tip blinding, an‎d bond separation. Also, based on the TEM test results, the distribution of NH2-MIL-101 (Cr) nanoparticles in the epoxy matrix was better.

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