Zhang Jing, Zhang Xiuqin, Wang Rui, Wang Wenqing, Zhao Hui, Yang Shuo, Dong Zhenfeng, Wang De-Yi, Pan Ye-Tang
School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China; Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029, China.
School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China.
Carbohydr Polym. 2024 Oct 1;341:122313. doi: 10.1016/j.carbpol.2024.122313. Epub 2024 May 23.
β-Cyclodextrin (β-CD) with a cage-like supramolecular structure possesses the hydrophobic internal ring and external hydroxyl groups, which are beneficial for intramolecular interactions known as "host-guest" chemistry. This study presents a β-CD-based three-functions-in-one and host-guest fire retardant (βCD-MOF@Schiff base), which incorporates self-crosslinking Schiff base into its cavity and modification of its surface by metal-organic framework (MOF). With the presence of 5 wt% of βCD-MOF@Schiff base, the LOI value of PLA composites increased to 29 % and showed 15 %, 17 % and 62 % reductions in peak heat release rate (pHRR), total heat release (THR), and the yield of hazard gas carbon monoxide, respectively. The mode action of FR on fire retardation of PLA showed that the FR promoted the char formation with higher thermal stability and graphitization, and modified the decomposition path of PLA. Additionally, the PLA composites exhibited enhanced UV resistance in the UVA and UVB areas with improved UV absorbance and the UPF values improving and doubling. This work develops a new approach to preparing biodegradable FR, which simultaneously endows fire safety and anti-UV properties for PLA.
具有笼状超分子结构的β-环糊精（β-CD）拥有疏水的内环和外部羟基，这有利于被称为“主客体”化学的分子内相互作用。本研究提出了一种基于β-环糊精的三合一主客体型阻燃剂（βCD-MOF@席夫碱），它将自交联席夫碱纳入其空腔，并通过金属有机框架（MOF）对其表面进行改性。在含有5 wt%的βCD-MOF@席夫碱的情况下，聚乳酸复合材料的极限氧指数值提高到29%，峰值热释放速率（pHRR）、总热释放（THR）和有害气体一氧化碳的产率分别降低了15%、17%和62%。阻燃剂对聚乳酸阻燃的作用方式表明，阻燃剂促进了具有更高热稳定性和石墨化的炭层形成，并改变了聚乳酸的分解途径。此外，聚乳酸复合材料在UVA和UVB区域表现出增强的抗紫外线性能，紫外线吸收率提高，紫外线防护系数（UPF）值提高并翻倍。这项工作开发了一种制备可生物降解阻燃剂的新方法，该方法同时赋予聚乳酸防火安全和抗紫外线性能。
