INTERFACIAL BEHAVIOR AND SURFACE MORPHOLOGY EFFECTS ON FLAME RETARDANCY AND ADHESION OF THERMOPLASTICS ADHESIVE SHEETS COMPOUND FILLED WITH Al(OH)₃ AND TRIPHENYL-PHOSPHATE

This study investigates the impact of aluminum trihydrate (ATH) and triphenyl phosphate (TPP) on the flame retardancy and adhesive properties of thermoplastic polyurethane (TPU), focusing on their dispersion behavior and surface interactions within the polymer. Scanning electron microscopy revealed distinct dispersion characteristics of ATH and TPP, influencing the formation of interfacial structures that enhance flame retardancy. Differential scanning calorimetry analysis was used to examine the thermal behavior of the adhesive sheets. The results indicate that TPP facilitates the formation of a protective char layer at the material surface, thereby improving thermal resistance and inhibiting flame propagation. In contrast, ATH primarily relies on endothermic and water vapor release, exhibiting a less stable interface with the TPU. These results highlight the crucial role of surface morphology and interfacial dynamics in enhancing the flame resistance and adhesive properties of TPU, contributing to a deeper understanding of surface and interface behavior.