The current study aims at monitoring the role of the different natural environments on the physical properties and fire hazards of HIPS composites ageing in Turpan and Qionghai. The results indicated that the chromatic aberration and degradation of surface appearance intensified with the increasing ageing time. More flame retardants migrated and were eroded for HIPS composites ageing in Qionghai than those ageing in Turpan, which was caused by the combination of sunlight, high temperature and rainwater in Qionghai. After degradation in the natural environments, the HIPS composites possessed the lower thermal stability and char residues, more toxic gases release, higher peak heat release rate and fire hazard. For example, the peak heat release rate in Qionghai increased by 88.9%, which is much higher than that of in Turpan (55.6 %). Moreover, the tensile strength and elongation at break decreased by 46% and 59 % for HIPS composites ageing in Turpan and reduced by 53 % and 67 % for HIPS composites aged in Qionghai, respectively. The results demonstrate that more serious degradation of physical properties and higher fire hazard for HIPS composites ageing in Qionghai than those in Turpan due to the different natural ageing environments.

当前的研究旨在监测不同自然环境对吐鲁番和琼海HIPS复合材料老化的物理性质和火灾隐患的作用。结果表明，随着时效时间的增加，色差和表面外观劣化加剧。琼海地区HIPS复合材料老化过程中迁移和侵蚀的阻燃剂比吐鲁番地区更多，这是由于阳光，高温和雨水的共同作用造成的。在自然环境中降解后，HIPS复合材料具有较低的热稳定性和炭残留物，释放出更多的有毒气体，更高的峰值放热率和火灾隐患。例如，琼海的峰值放热率提高了88.9％，远高于吐鲁番的峰值放热率（55.6％）。而且，吐鲁番地区的HIPS复合材料的抗拉强度和断裂伸长率分别降低了46％和59％，琼海地区的HIPS复合材料的抗拉强度和断裂伸长率分别降低了53％和67％。结果表明，由于自然老化环境的不同，琼海地区的HIPS复合材料老化比吐鲁番地区的物理性能退化更为严重，火灾危险性更高。