Optimization of TPU/TiO₂ Films Using UV Additives for Improved Weather Stability of LTA Hull Materials

Titanium dioxide has sustained a vital role over the past few years as the most widely used material among various commercial inorganic UV absorbers due to its chemical stability, low cost, and good UV protection. TiO₂ and numerous organic UV absorbers have been explored to be incorporated in Thermoplastic Polyurethane (TPU)-based films for coated and laminated textiles useful for aerostats and airships as Lighter than Air (LTA) hull material. TPU films based on TiO₂ were prepared using commercially available UV additives (Hindered amine light stabilizer, benzotriazole-based UV absorber, and antioxidant) at various concentrations. Prepared films were optimized to achieve the best possible combination of all UV enhancing materials and assessed for artificial weathering tests. UV–VIS spectrum and infra-red spectrum were obtained. Characterization of material and another testing such as tensile testing, yellowness index, UPF, and gas barrier properties of prepared TPU/TiO₂ films were determined after every 100 h. TPU/TiO₂ films that incorporate UV absorbers and other additives accomplished the requirement for improved resistance against UV and photo-oxidation.