Processamento e caracterização de compósitos poliamida6/ferrita de níquel.

Abstract

The load of nickel ferrite (NiFe204 ) had its particle size changed by firing, for incorporation into the matrix of polyamide 6 with two mixing equipment. Aiming to evaluate the effect of calcination temperature on particle size and shape of the load of nickel ferrite (NiFe204 ) and its incorporation into the polymer matrix of nylon 6, but also investigate the influence of changes in processing conditions between load and matrix. The loading of nickel ferrite (NiFe204) was used as synthesized by combustion reaction and after calcination temperatures, 700, 900 and 1200oC and characterized by XRD - X, X-ray fluorescence, infrared spectroscopy, adsorption nitrogen, scanning electron microscopy, thermogravimetry and measuring the magnetic characteristics. To form the composite, the load was incorporated at a concentration of 50% by weight in a polyamide 6 matrix previously dried in an oven at 240 0 C/48h by vacuum. The mixture was held at two facilities: a type of internal mixer coupled to a torque rheometer and a homogenizes The resulting mixture was characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy, and testing of selective absorption rate. The results show that the load as synthesized phase consists of the inverse spinel nickel ferrite, with traces of hematite (Fe203), and morphology consisting of irregular clusters. The increase of calcination temperature led to the growth of clusters and formation of single phase spinel ferrite nickel reverse. The X-ray diffraction patterns of the composites showed that the increase in the calcination temperature increased the crystallinity of the cargo, not being altered by processing, and TG curves of the increase of calcination temperature increased the thermal stability of the array. For a larger particle size using the homogenizer promotes good dispersion, no change in particle size. The selective absorption test showed that the composite produced with the load synthesized, presented for the frequency attenuation DCS1800, which is used in cellular telephony.