阻燃剂
聚乳酸
热稳定性
烧焦
席夫碱
环糊精
超分子化学
热分解
化学
材料科学
高分子化学
化学工程
有机化学
聚合物
热解
分子
工程类
作者
Jing Zhang,Xiuqin Zhang,Rui Wang,Wenqing Wang,Hui Zhao,Shuo Yang,Zhenfeng Dong,De‐Yi Wang,Ye-Tang Pan
标识
DOI:10.1016/j.carbpol.2024.122313
摘要
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.
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