Dielectric relaxations in an adhesive system

The stratospheric balloons are the only vehicles which can stay aloft in the stratosphere (altitude range between 12 and 45 km). Pressurized stratospheric balloons have been specially developed for an onboard mass of 50 kg at an altitude near 30 km, during a flying up to 3 months. Their specifications require good mechanical strength of the adhesive system in a broad temperature range, from -90degC (through the troposphere at about 10 km altitude) to +170degC (manufacturing conditions). The purpose of this work is to characterize the materials constituting the envelope of pressurized stratospheric balloons and the adhesion, for improving the mechanical strength.