This work deals with issues of dielectric composite materials. The general aim is to observe how the amout of nanofilling influence dielectric spectrum in dependence on relative humidity and temperature which is measured on prepared samples. For this purpose had been created variety of a samples of electroinsulating varnish with different percentage of filling with nanoparticles. Experimental material is epoxy resin NH91 LV filled by Al2O3 nanoparticles.

The bachelor thesis submitted deals with properties of electro-insulating lacquer hardenable by ultraviolent radiation and temperature. Within the theoretical part a summary of electro-insulating lacquers used in electrotechnics has been elaborated. Chemical changes that take place in this material group have been described during hardening process. A method of dielectric relaxation spectroscopy specifically focused on mathematic and physical description of polarisation and conductive mechanisms taking place in the structure of the given material has been closely studied. In the experimental part a workplace for hardening and long-term exposition of lacquered samples during simultaneous effect of various climatic elements has been designed and built. The selected electric and mechanical properties have been monitored on three sets of experimental samples prepared by means of different methodical procedures. The results gained have been mathematically evaluated and physically interpreted in term of methodical procedure of hardening and different temperature of measurement.

This work deals with properties of electro insulating varnishes and composite materials. The general aim is to study the influence of nanoparticles on dielectric properties of electro insulating varnishes.

This thesis resumes both theoretical and practical knowledge with surface protection by wet painting which the student achieved during her studies and within her practice which she got in the painting shop of cabs for building, handling and agricultural machines. In her thesis the student has found out that one of current trends focuses on the method which is ecologically friendly and preserves paint lifetime. To achieve that, ED-coat painting is used first and then followed by the painting of waterborne paint. Within the scope of her thesis objective she has also optimised the process of surface protection respective technological pre-treatments and parameters which are carried out during ED-coat and e-coat painting, such as optimal thickness of coating, temperatures or technological time outs.