School of Energy, Materials and Chemical Engineering, Hefei University, 99 Jinxiu Avenue, Hefei, Anhui 230601, PR China.
Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
Int J Biol Macromol. 2024 Oct;278(Pt 1):134558. doi: 10.1016/j.ijbiomac.2024.134558. Epub 2024 Aug 10.
Polylactic acid (PLA) is widely known for its biocompatibility, biodegradability, and high transparency. However, it still has varied limitations such as flammability, UV sensitivity, and poor oxygen barrier properties. To address these issues, a bio-based compound, hexasubstituted cyclotriphosphazene (HVP), was synthesized by using vanillin and hexachlorocyclotriphosphazene to enhance the overall performance of PLA. The resulting PLA/HVP composites demonstrated improved mechanical strength and UV resistance. Specifically, PLA/3HVP, with a 3 wt% HVP loading, achieved a UL-94 V-0 rating and a high limiting oxygen index of 26.5 %. Cone calorimeter tests revealed that PLA/3HVP possessed a significantly longer ignition time and a lower peak heat release rate compared to pure PLA. These burning testing results indicated the enhanced fire resistance. Additionally, the oxygen transmission rate of PLA/3HVP was reduced by 81.1 % compared to pure PLA. When used as food packaging, the weight loss of mangoes covered with PLA/3HVP film was 2.2 % after 7 days, compared to 2.5 % with pure PLA film, highlighting its potential for food preservation applications.
聚乳酸（PLA）以其生物相容性、可生物降解性和高透明度而广为人知。然而，它仍然存在各种局限性，如可燃性、对紫外线敏感和氧气阻隔性能差。为了解决这些问题，我们通过使用香草醛和六氯环三磷腈合成了一种生物基化合物——六取代环三磷腈（HVP），以提高 PLA 的整体性能。结果表明， PLA/HVP 复合材料的机械强度和耐紫外线性能得到了提高。具体来说，当 HVP 负载量为 3wt%时， PLA/3HVP 达到 UL-94 V-0 等级和 26.5%的高极限氧指数。锥形量热仪测试表明，与纯 PLA 相比， PLA/3HVP 具有更长的点火时间和更低的峰值热释放率。这些燃烧测试结果表明其阻燃性能得到了增强。此外，与纯 PLA 相比， PLA/3HVP 的氧气传输率降低了 81.1%。当用作食品包装时，用 PLA/3HVP 薄膜覆盖的芒果在 7 天后的失重率为 2.2%，而纯 PLA 薄膜的失重率为 2.5%，这表明其在食品保鲜方面具有应用潜力。
