Development of super insulation seals with low thermal conductivity, low acoustic conductivity and good mechanical properties with aerogel reinforcement for conventional materials

In this thesis, the synthesis of Silica Aerogel, Polyurethane Aerogel, Polyimide Aerogel, Silica-Polyimide Hybrid Aerogel, Silica-Polyurethane Hybrid Aerogel, Polyimide-Polyurethane Hybrid Aerogel and Silica-Polyimide-Polyurethane Hybrid Aerogel were carried out and the aerogels were transferred to the felt in powder/particle form. The thermal and acoustic insulation properties of the newly developed aerogel-incorporated felt materials were compared with each other and with the additive-free layered felt material. Electric motors, which are used as propulsion systems in electric vehicles, have different thermal and acoustic insulation needs compared to the internal combustion engines in today's fossil fuel-powered vehicles. The ultra-high porosity of aerogels (up to 99.8% porous structure and average pore diameter down to 5-10 nanometers) enables them to respond perfectly to insulation needs, especially at high sound frequencies. In addition, heating and cooling systems in electric vehicles are directly related to the battery system, not the engine. Therefore, improvements should be made in thermal insulation systems as well. Aerogels are innovative materials that contain at least 85% (up to 99.8%) air, constituting the lightest material class in the world, currently known as the best heat and sound insulation material. This study will provide an innovative technology alternative to conventional insulation technology and materials, and a new product range would be obtained by applying this technology. Key words: aerogel, felt, acoustic insulation, thermal insulation, hybrid, electric vehicles