Particles sizes effect on the Rheological properties of Nickel doped Barium Titanate of Nano particle in IPN-polymer matrix

Abstract

In this article,we have synthesizedcomposite material by dispersing variable amount of nanoparticles of nickel-doped BaTiO₃ nanoparticulate in IPN-polymer matrix.­­­­­The chemical composition of the selected specimen is represented by general formula Ba(Ti_1-zX_z)O₃,where X is Ni and z=0.2 and it was prepared by sol-gel technique. For the preparation of the polymer-matrix composite materials, Polyurethane (PU) as soft phase and PEMA as hard phase were selected as matrix materials.The polymer-based composite was fabricated from casting method by dispersing the nanoparticles in the IPN matrix along with coupling agent (vinyl triethoxysilane). The results from the X-ray diffractogram show that the diameter of the particles which are doped with nickel in the specimen lie in the range of 20-60nm. SEM analysis was used to investigate the morphology of the doped BaTiO₃ as well as polymer composite. From the SEM observation, the nanoparticles of doped BaTiO₃ were found to be homogeneously dispersed in the polymer matrix. The ratio of soft/hard phase actually modifies the crosslinking density of the respective polymer in the matrix and also shows the better impact on the rheological properties. In this paper, the effect of particle size of fine doped BaTiO₃ powder on rheological properties of doped BaTiO₃/IPN-polymer composite are discussed along with the role of soft/hard phase matrix. Tensile strength, elongation at a fracture of IPN composite, and UTS strength were evaluated  by Instran testing machine at room temperature at a crosshead speed of 5mm/min. Better dispersion and strong crossliking showed better hardness and tensile strength

Key Words: IPN-polymer, Nanoparticle, Rheology, Crosslinking, Polymer Composite