Wang Kui, Liu Hang, Wang Chong, Huang Weijiang, Tian Qin, Fu Qiuping, Yan Wei
School of Chemistry and Materials Engineering, Guiyang University, Guiyang 550005, China.
ACS Omega. 2020 Dec 24;6(1):666-674. doi: 10.1021/acsomega.0c05208. eCollection 2021 Jan 12.
Flame retardancy of epoxy resin (EP) plays a vital role in its applications. When inorganic nanomaterials form inorganic/organic nanocomposites, they exhibit special flame-retardant effects. In this study, EP nanocomposites were prepared by the incorporation of SiO nanoparticles and phenethyl-bridged 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivative (DiDOPO), and the synergistic effects of SiO nanoparticles and DiDOPO on the flame-retardant performance of EP were discussed. Results indicated that the introduction of only 15 wt % SiO and 5 wt % DiDOPO in EP leads to the increase in the limiting oxygen index from 21.8 to 30.2%, and the nanocomposites achieve the UL-94 V-0 rating. Thermogravimetric analysis revealed that char yield increases with the increase in the SiO content of the nanocomposites and that an increased amount of thermally stable carbonaceous char is formed. SiO nanoparticles can improve the thermal stability and mechanical performance of EP; hence, the nanoparticles can serve as an efficient adjuvant for the DiDOPO/EP flame-retardant system.
环氧树脂（EP）的阻燃性在其应用中起着至关重要的作用。当无机纳米材料形成无机/有机纳米复合材料时，它们会表现出特殊的阻燃效果。在本研究中，通过掺入SiO纳米颗粒和苯乙基桥联的9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）衍生物（DiDOPO）制备了EP纳米复合材料，并讨论了SiO纳米颗粒和DiDOPO对EP阻燃性能的协同作用。结果表明，在EP中仅引入15 wt%的SiO和5 wt%的DiDOPO可使极限氧指数从21.8%提高到30.2%，且纳米复合材料达到UL-94 V-0等级。热重分析表明，焦炭产率随着纳米复合材料中SiO含量的增加而增加，并且形成了数量增加的热稳定碳质焦炭。SiO纳米颗粒可以提高EP的热稳定性和机械性能；因此，这些纳米颗粒可以作为DiDOPO/EP阻燃体系的有效助剂。
