A new strategy for the preparation of polylactic acid composites with flame retardancy, UV resistance, degradation, and recycling performance
作者：Jinxuan Chen
關(guān)鍵字：PLA，F(xiàn)lame retardancy，UV resistance，Degradation，Recycling
論文來源：期刊
發(fā)表時(shí)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(jī)的解決方案之一。但其使用性能（如阻燃、耐候、機(jī)械性能）和回收性能限制了其廣泛應(yīng)用。在這項(xiàng)工作中，由單寧微球和植酸（PA）合成了具有核殼結(jié)構(gòu)的生物基添加劑（PA-Fe-HBT）。通過3wt% PA-Fe-HBT的存在，極限氧指數(shù)提高至25.5%，樣品可通過UL-94 V-0級(jí)。同時(shí)，復(fù)合材料的機(jī)械性能保持良好。此外，復(fù)合材料的抗紫外線老化和紫外線防護(hù)能力顯著提高。PLA/3%PA-Fe-HBT樣品的紫外（UV）透過率與對(duì)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(jìn)了復(fù)合材料的化學(xué)回收。經(jīng)過簡單的提純，得到純度88%的乳酸。據(jù)信，這項(xiàng)工作提出了一種巧妙的設(shè)計(jì)策略來制備具有阻燃、抗紫外線和化學(xué)回收性能的PLA/PA-Fe-HBT復(fù)合材料。