Qiao Run-Meng, Zhao Chi-Peng, Liu Jia-Lei, Zhang Mao-Lin, He Wen-Qing
Key Laboratory of Agricultural Film Pollution Prevention and Control, Ministry of Agriculture and Rural, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Polymers (Basel). 2022 Mar 31;14(7):1434. doi: 10.3390/polym14071434.
Poly-(butylene adipate-co-terephthalate) (PBAT) has become one of the most prevalent biodegradable plastic film materials owing to its good degradability, mechanical properties, and processability. However, the degradation time of this material was too fast and the functional period was short, which limited its application. Herein, three new tropolone-based UV absorbers (UVA-1C, UVA-4C and UVA-6C) were rationally designed and blended into PBAT. The PBAT/UVA films that formed were used against UV aging and prolonged the functional period of PBAT film. The three new absorbers were synthesized by bridging two tropolones using three different organic chains with different flexibility. Among them, the UVA-6C showed the strongest UV absorbance at around 238 nm and 320 nm. Consequently, the PBAT/UVA-6C film showed an extended validity period of 240 h in the Xenon lamp aging machine and a prolonged functional period of 8 d during the field application test when compared to pure PBAT. More importantly, a 7.8% increase in the maize yield was obtained under PBAT/UVA-6C film relative to pure PBAT film. Obviously, the novel prepared UVA-6C compound is a good candidate for UV absorption in PBAT, which makes PBAT/UVA-6C film more advantageous over pure PBAT in practical applications as biodegradable agricultural film.
聚（己二酸丁二醇酯-co-对苯二甲酸丁二醇酯）（PBAT）因其良好的降解性、机械性能和加工性能，已成为最普遍的可生物降解塑料薄膜材料之一。然而，这种材料的降解时间过快且功能期较短，限制了其应用。在此，合理设计了三种新型的基于托酚酮的紫外线吸收剂（UVA-1C、UVA-4C和UVA-6C）并将其混入PBAT中。形成的PBAT/UVA薄膜可抵御紫外线老化并延长PBAT薄膜的功能期。这三种新型吸收剂是通过使用三条具有不同柔韧性的不同有机链连接两个托酚酮而合成的。其中，UVA-6C在238nm和320nm左右表现出最强的紫外线吸收能力。因此，与纯PBAT相比，PBAT/UVA-6C薄膜在氙灯老化试验箱中的有效期延长了240小时，在田间应用测试中的功能期延长了8天。更重要的是，相对于纯PBAT薄膜，PBAT/UVA-6C薄膜覆盖下的玉米产量提高了7.8%。显然，新制备的UVA-6C化合物是PBAT中紫外线吸收的良好候选物，这使得PBAT/UVA-6C薄膜在作为可生物降解农用薄膜的实际应用中比纯PBAT更具优势。
