Abstract: In order to investigate the effect of aging on the structural properties, combustion performance and fire hazard of thermoplastic polystyrene insulation boards, high and low temperature cycling was used to accelerate the aging of the material. With the help of scanning electron microscope, fourier infrared, cone calorimeter, the structure and fire performance parameters of the accelerated aging material were tested and analyzed. The results show that during the accelerated aging process of high and low temperature cycling, the overall configuration of the thermoplastic polystyrene material bent, and the support of the internal pore structure became weaker; after the accelerated aging process, the absorption intensity of the characteristic peaks of the specific chemical bonds increased, and the chemical composition of the material changed; through the comparative analysis of the indexes measured by cone calorimetry experiments, it was found that the fire danger of the material after accelerated aging was significantly higher than that of the unaged material.

Key words: thermoplastic polystyrene, high and low temperature cycling, accelerated aging, combustion characteristics, fire hazard