热和光等外界因素会造成高密度聚乙烯（HDPE）的分子链断裂，从而降低其固有性能。因此，提高HDPE的耐久性以及抗腐蚀性对扩展其应用具有较大的意义。针对这一情况，试验采用硝酸改性的碳纳米管（m-CNT）作为填料制备了具有高耐久性的HDPE/m-CNT复合材料，并对其力学性能以及耐久性能进行了研究。结果表明：由于m-CNT对基体的桥接作用，HDPE/m-CNT复合材料的力学性能明显增加，并在HDPE/m-CNT-3中达到最大值。抗光热耐久性中，HDPE/m-CNT-3在经过96 h的老化后拉伸强度和抗压强度下降率仅仅为5.5%和2.1%，表现出最佳的耐久性。m-CNT的加入可以有效地增强HDPE复合材料的耐久性。

External factors such as irradiation and light can cause the molecular chain of high density polyethylene(HDPE) to break and reduce its inherent properties. Therefore, improving the durability and corrosion resistance of HDPE is of great significance for expanding its application. In view of this situation, HDPE/m-CNT composites with high durability were prepared by using nitric acid modified carbon nanotubes (m-CNT) as fillers, and their mechanical properties and durability were studied. The results showed that the mechanical properties of HDPE/m-CNT composites were significantly increased due to the bridging effect of m-CNT on the matrix, and reached the maximum value in HDPE/m-CNT-3. In the photothermal durability, the tensile strength and compressive strength of HDPE/m-CNT-3 decreased by only 5.5% and 2.1% after 96 h aging, showing the best durability. Therefore, the above results show that the addition of m-CNT can effectively enhance the durability of HDPE composites.