In recent decades, many wind turbines for the production of renewable energy have been installed in Germany. Due to technological developments and the limited service life, many of the turbines will be dismantled/modernised in the next years. The resulting “waste” must be returned to the material cycle for sustainable handling. However, due to its complexity, a new processing scheme must be established. One possibility is the pyrolysis of the rotor blades. The thesis aims to mimic the pyrolysis process via thermal analysis coupled to mass spectrometry (TOF-MS and FT-MS). Moreover, the pyrolysis products (solids/liquids) of a pilot-plant will be investigated.