Highly filled composites are polymers with high concentration of organic or inorganic particles. Particles are added to the polymer matrix and the newly formed material exhibits the properties of both substances (from polymer and filler particles). Development in this field is leaning towards optimal combination of properties, from both components. Combining polymers with solid particles is a great industrial importance and efficient way to obtain new materials with desired mechanical, thermal, magnetic, etc. properties.
The aim of the thesis is to determine the influence of different concentrations of magnetic particles in polyamide, to determine thermal and rheological properties of the materials. One of the goals was also to determine the stability of material in time period under constant measuring conditions of temperature and strain frequency and to determine the range of linear viscoelastic response of the material. Moreover, we wanted to determine the influence of concentration of metal particles and increasing shear stress on material viscosity and the influence of temperature on viscoelastic properties of the material in temperature range from 170 to 240°C.
The results showed that the concentration of metal magnetic particles reduces the specific heat of the material. We determined the melting point and the temperature of glass transition for all the materials. We found out that at higher particle concentration in polymer, the range of its linear response is shorter, the viscosity of the composite is higher and the values of storage and loss modulus of the material are higher.
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