The present study investigates new polyurethanes with improved stability to UV radiation by the inclusion of azobenzene side groups on the polymer main chain. These polyurethanes were prepared from a prepolymer (polycaprolactone diol and 1,6-hexamethylene diisocyanate) with 2,4-dihydroxyazobenzene (Sudan Orange G) as a chain extender. A polyurethane chain-extended with 1,4-butanediol was prepared for comparison. The paper studies how the amount and structure of the chain extenders affect the polymer structure and the mechanical, surface and thermal properties of the obtained polyurethanes, before and after subjection to UV irradiation, All the synthesized polyurethanes showed good thermal stability up to 250 ºC. In terms of mechanical properties, the samples exhibit good tensile strength and elongation at break. The surface contact angle increases with chain extender content and UV exposure time. The inclusion of azobenzene groups into the polyurethane main chain makes these polyurethanes appropriate for use in colored polymer materials with good UV radiation stability.

本研究通过在聚合物主链上包含偶氮苯侧基来研究对紫外线辐射具有更高稳定性的新型聚氨酯。这些聚氨酯由带有 2,4-二羟基偶氮苯（苏丹橙 G）作为扩链剂的预聚物（聚己内酯二醇和 1,6-六亚甲基二异氰酸酯）制备。制备了用 1,4-丁二醇扩链的聚氨酯用于比较。本文研究了扩链剂的用量和结构如何影响聚合物结构以及所得聚氨酯的机械、表面和热性能，在紫外线照射前后，所有合成的聚氨酯在高达 250 ºC 的温度下均表现出良好的热稳定性。在机械性能方面，样品表现出良好的拉伸强度和断裂伸长率。表面接触角随着扩链剂含量和紫外线照射时间而增加。聚氨酯主链中包含偶氮苯基团使这些聚氨酯适用于具有良好紫外线辐射稳定性的有色聚合物材料.