MS-7-P-1942 THE STUDY OF THE DIFFERENT PERCENTAGE PERFORMANCE OF NANOPARTICLES ON THE PROPERTIES OF EPOXY RESIN

This paper deals with the study of impact of different percentage filling of nanoparticles on the electrical properties of epoxy resin, which has very good mechanical and electrical properties. The sample is the blended mixture which is evacuated, subjected to ultrasound and then cured. It is expected that the formation of lumps should be minimised due to the influence of microwaves. Nanoparticles should be equally distributed in epoxide volume for this case. Unfortunately, this assumption was not proven. The mixture contains an epoxy resin CY228, hardener HY918, softener DY045 and accelerator DY062. Nanoparticles of alumina (Al₂O₃), sulfur dioxide (SiO₂), titanium dioxide (TiO₂) and tungsten oxide (WO₃) from Sigma Aldrich Company were used as a filler. There were made samples for each filler with 0.25, 0.5, 1, 2 weight percent for our experiment and were determined values of the dissipation factor tgδ, permittivity εr and resistivity ρv by measuring.

We are able to prepare samples with better electrical properties. Unfortunately, despite the advanced procedure of samples production, our main problem is the inhomogeneity of distribution of nanoparticles in the sample manifested by the formation of lumps, documented by figures 3 and 4. It can be assumed that the optimization of the manufacturing process will be achieved to increase the quality of the samples and particularly their final properties of measured electrical parameters.

Figures 3 and 4 show randomly chosen samples observed using a detector of secondary electrons in a scanning electron microscope REM Jeol JSM 6700F at a magnification of 10.000x and 50.000x.

The lowest permittivity was encountered in the samples with the 2% filling of Al₂O₃ and SiO₂, in the case of TiO₂ it was 1% (see Fig. 1).

In the samples containing Al₂O₃ a SiO₂ the impact of the nanoparticles on the intrinsic resistivity is evident in the full temperature range (Fig. 1). The highest intrinsic resistivity is in the sample with the 0,5% content of SiO₂, apart from the sample with 0,5% of Al₂O₃which has a lower resistivity than pure epoxide.

The most pronounced improvement in electrical properties of the resulting nanocomposite was achieved by adding Al₂O₃ and SiO₂. The influence of TiO₂ was less obvious, and adding the nanoparticles of WO₃ caused no change in any of the measured parameters.