Evolution of the Structure and Properties of Thermoplastic Polyurethane Under the Joint Action of Fuel Oil and Ultraviolet Light
YAN Ge1,2, ZHANG Huijuan1, CAI Lihai2, SHAO Weiguang2,*, LIU Wenyan1
1 School of Mechanical & Electrical Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China 2 Institute of Systems Engineering, Academy of Military Sciences of the People's Liberation Army, Beijing 100071, China
Abstract: Thermoplastic polyurethanes (TPU) have the advantages of good wear resistance and oil resistance, which makes them widely used in the field of oil storage and transportation, but it is found that the combined influence of fuel oil and ultraviolet light will accelerate the aging of materials during use. The research on the evolution of the structure and performance of TPU under the joint action of fuel oil and ultraviolet light has important guiding significance for ensuring the safety of oil storage and transportation containers and improving oil resistance. In this work, TPU was immersed in simulated fuel oil B liquid, gasoline, diesel fuel and aviation kerosene, and ultraviolet aging was carried out at the same time as the sample without oil treatment, and the structure and performance changes of TPU at different aging times were analyzed by FTIR, mechanics, GPC and other characterization methods, and the reasons why fuel oil treatment accelerated the change of TPU structure and performance were analyzed. The results show that with the increase of UV aging time, the chemical bonds such as -N-H bonds and ether bonds in the infrared spectrum of vacuum heat treatment UV aging samples and oil treatment UV aging samples are destroyed, but the change trend of oil treatment samples is more obvious. With the increase of ultraviolet aging time, the molecular weight of the B liquid treated sample shows a trend of first decreasing and then slightly increasing, indicating that the TPU chemical bond is broken first, and then cross-linking and other reactions occurr under the action of light irradiation. After 100 h of UV aging, the mechanical properties of B liquid, gasoline and aviation coal treated samples are basically lost. After UV aging for 200 h, the mechanical properties of the diesel treatment sample are basically lost. Through the enrichment and infrared analysis of the treated B liquid, it is found that after TPU come into contact with the oil, the anti-aging agent in the material precipitates, which significantly reduces the anti-ultraviolet aging performance.
阎格, 张慧娟, 蔡利海, 邵伟光, 刘文言. 燃料油与紫外光共同作用下热塑性聚氨酯结构与性能演变规律[J]. 材料导报, 2024, 38(6): 22050216-6.
YAN Ge, ZHANG Huijuan, CAI Lihai, SHAO Weiguang, LIU Wenyan. Evolution of the Structure and Properties of Thermoplastic Polyurethane Under the Joint Action of Fuel Oil and Ultraviolet Light. Materials Reports, 2024, 38(6): 22050216-6.
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2024, Vol. 38 
