Zhao Kaixiong, Hu Weizhao, Hou Yanbei
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Suzhou Key Laboratory for Urban Public Safety, Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu 215123, P.R. China.
ACS Appl Mater Interfaces. 2024 Sep 4;16(35):46750-46760. doi: 10.1021/acsami.4c09184. Epub 2024 Aug 20.
Ce-based metal-organic frameworks (Ce-MOFs) were successfully synthesized by coordinating binary acid and amino structures with cerium oxides. The quantum dot scale endows Ce-MOFs with enhanced modifiability. Additionally, the phosphorus-rich biomass phytic acid, with its numerous hydroxyl groups, strengthens the H-bond network within the system. Ce-MOFs-centered nanoconfinement can form through the multiple H-bond interactions between Ce-MOFs and polylactic acid (PLA) molecules, thereby improving the mechanical and flame-retardant properties of PLA. The PLA/CeCO-P-3 composite exhibited excellent fire retardancy and toxic gas suppression, with a 27.8% decrease in the peak heat release rate and a 50% reduction in the peak smoke production rate. Notably, PLA/CeCO-P-3 showed an 80% lower peak CO release compared with the pure PLA sample. Moreover, the incorporation of Ce-MOFs positively influenced the tensile properties of PLA, transforming it from brittle to tough. This work designed and synthesized Ce-MOFs on the quantum scale. The resulting Ce-MOFs with the anticipated structure offer a novel direction for preparing MOFs for flame retardant applications.
通过将二元酸和氨基结构与氧化铈配位，成功合成了铈基金属有机框架材料（Ce-MOFs）。量子点尺度赋予了Ce-MOFs更强的可修饰性。此外，富含磷的生物质植酸带有大量羟基，强化了体系内的氢键网络。以Ce-MOFs为中心的纳米限域结构可通过Ce-MOFs与聚乳酸（PLA）分子之间的多重氢键相互作用形成，从而改善PLA的机械性能和阻燃性能。PLA/CeCO-P-3复合材料表现出优异的阻燃性和有毒气体抑制性能，峰值热释放速率降低了27.8%，峰值产烟速率降低了50%。值得注意的是，与纯PLA样品相比，PLA/CeCO-P-3的峰值CO释放量降低了80%。此外，Ce-MOFs的加入对PLA的拉伸性能产生了积极影响，使其由脆性转变为韧性。这项工作在量子尺度上设计并合成了Ce-MOFs。所得具有预期结构的Ce-MOFs为制备用于阻燃应用的金属有机框架材料提供了新的方向。
