阻燃剂
聚脲
烧焦
弹性体
材料科学
可燃性
燃烧
极限抗拉强度
复合材料
燃烧性
聚合物
高分子化学
化学工程
聚氨酯
有机化学
化学
工程类
作者
Hongyang Deng,Lixian Guo,Keping Chen,Pingfeng You,Ping Zhang,Yewei Xu,Ningning Song,Chen Tian,Jianhua Wang,Shuen Liang
标识
DOI:10.1016/j.compositesb.2024.111276
摘要
Polyurea (PU) elastomers have become increasingly popular in recent years due to their exceptional blast mitigation, ballistic protection, and wear resistance properties. However, their applications as protective materials are often limited as a result of their high flammability. In this study, aromatic dianhydrides (ArDAs) were employed to capture the thermal decomposing products of PU during combustion and facilitate the generation of highly heat-resistant aromatic polyimides (i.e., end group capturing effect), thus enhancing the material's char-forming ability and improving its flame retardancy. The ArDAs were found to significantly reduce the peak heat release rate (PHRR), total heat release (THR), total smoke release (TSR), and total CO release (TCO) of PU, and meanwhile increased the amount of char residue. At 20 wt% content of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), PHRR, THR, TSR and TCO of PU were reduced by 70.6%, 32.5%, 44.7% and 58.8%, respectively, the char residue was increased by 405%, and the mechanical properties of PU were well maintained (88.5% tensile strength and 91.0% elongation at break of pure PU). These findings demonstrate that ArDAs could serve as a new kind of halogen/phosphorus-free flame retardant for PU elastomers.
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