Jiang Jiawei, Huo Siqi, Zheng Yi, Yang Chengyun, Yan Hongqiang, Ran Shiya, Fang Zhengping
Laboratory of Polymer Materials and Engineering, NingboTech University, Ningbo 315100, China.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Polymers (Basel). 2021 Oct 23;13(21):3648. doi: 10.3390/polym13213648.
Hexaphenoxycyclotriphosphazene (HPCP) is a common flame retardant for epoxy resin (EP). To improve the thermostability and fire safety of HPCP-containing EP, we combined UiO66-NH (a kind of metal-organic frame, MOF) with halloysite nanotubes (HNTs) by hydrothermal reaction to create a novel synergistic flame retardant (H-U) of HPCP for EP. For the EP containing HPCP and H-U, the initial decomposition temperature () and the temperature of maximum decomposition rate () increased by 11 and 17 °C under nitrogen atmosphere compared with those of the EP containing only HPCP. Meanwhile, the EP containing HPCP and H-U exhibited better tensile and flexural properties due to the addition of rigid nanoparticles. Notably, the EP containing HPCP and H-U reached a V-0 rating in UL-94 test and a limited oxygen index (LOI) of 35.2%. However, with the introduction of H-U, the flame retardant performances of EP composites were weakened in the cone calorimeter test, which was probably due to the decreased height of intumescent residual char.
六苯氧基环三磷腈（HPCP）是环氧树脂（EP）常用的阻燃剂。为提高含HPCP的EP的热稳定性和防火安全性，我们通过水热反应将UiO66-NH（一种金属有机框架，MOF）与埃洛石纳米管（HNTs）结合，制备了一种用于EP的新型HPCP协同阻燃剂（H-U）。对于含HPCP和H-U的EP，在氮气气氛下，其初始分解温度（）和最大分解速率温度（）比仅含HPCP的EP分别提高了11℃和17℃。同时，由于添加了刚性纳米粒子，含HPCP和H-U的EP表现出更好的拉伸和弯曲性能。值得注意的是，含HPCP和H-U的EP在UL-94测试中达到了V-0等级，极限氧指数（LOI）为35.2%。然而，随着H-U的引入，EP复合材料在锥形量热仪测试中的阻燃性能减弱，这可能是由于膨胀残余炭的高度降低所致。
