Tensile modulus of clay‐reinforced system supposing the interphase effectiveness for load transferring

Abstract

AbstractIn this work, we focus on the minimum interfacial shear modulus (Sc) and interfacial shear modulus (Si) controlling the efficiency of interphase zone in polymer clay nanocomposites, since the stress transferring through interphase section handles the stress bearing of samples. The roles of “Sc” and “Si” in the effective thickness and concentration of interphase zone are clarified. Moreover, a model based on Kolarik system is developed for modulus of clay‐reinforced nanocomposites, which reflects the efficiency of interphase zone. The experimental data of tensile modulus for many samples display good matching with the predictions of the advanced model. Also, all model parameters properly manipulate the nanocomposite's modulus. Thick clay (t > 4 nm) cannot generate the interphase zone in the samples. A poor “Sc,” high “Si,” and thin clay improve the modulus of nanocomposites, but very high “Sc,” extremely poor “Si,” or thick clay cause a poor nanocomposite. A high value of Sc = 0.21 GPa deteriorates the reinforcing efficiency of clay in nanocomposites. Furthermore, low Si < 35 GPa produces a poorer nanocomposite than the polymer matrix. Additionally, complete exfoliation of thin clay (t = 1 nm) causes 900% improvement in the nanocomposite's modulus.