A new strategy for the preparation of polylactic acid composites with flame retardancy, UV resistance, degradation, and recycling performance
作者：Jinxuan Chen
關鍵字：PLA，Flame retardancy，UV resistance，Degradation，Recycling
論文來源：期刊
發表時間：2023年
Polylactic acid (PLA) is one of the solutions to the white pollution and energy crisis. However, the using performance (such as flame retardant, weather resistance and mechanical properties) and recycling performance limit its wide application. In this work, a bio-based additive (PA-Fe-HBT) with core–shell structure is synthesized by tannins microspheres and phytic acid (PA). By the presence of 3 wt% PA-Fe-HBT, the limited oxygen index is increased to 25.5%, and the sample can pass UL-94 V-0 grade. At the same time, the mechanical properties of the composites remain good. Besides, the ultraviolet aging resistance and ultraviolet protection ability of the composite are significantly improved. The ultraviolet (UV) transmittance of PLA/3%PA-Fe-HBT sample shows a decrease of 99.97% compared with control PLA. More importantly, the chemical recycling of composites is promoted by PA-Fe-HBT in the absence of external heating. After a simple purification, 88% purity of lactic acid is obtained. It is believed that this work proposes an ingenious design strategy to prepare PLA/PA-Fe-HBT composites with flame-retardancy, UV resistance and chemical recycling performances.
聚乳酸（PLA）是解決白色污染和能源危機的解決方案之一。但其使用性能（如阻燃、耐候、機械性能）和回收性能限制了其廣泛應用。在這項工作中，由單寧微球和植酸（PA）合成了具有核殼結構的生物基添加劑（PA-Fe-HBT）。通過3wt% PA-Fe-HBT的存在，極限氧指數提高至25.5%，樣品可通過UL-94 V-0級。同時，復合材料的機械性能保持良好。此外，復合材料的抗紫外線老化和紫外線防護能力顯著提高。PLA/3%PA-Fe-HBT樣品的紫外（UV）透過率與對照PLA相比下降了99.97%。更重要的是，在沒有外部加熱的情況下，PA-Fe-HBT促進了復合材料的化學回收。經過簡單的提純，得到純度88%的乳酸。據信，這項工作提出了一種巧妙的設計策略來制備具有阻燃、抗紫外線和化學回收性能的PLA/PA-Fe-HBT復合材料。