Transition metal as flame retardant has attracted intense interests in recent years. In this work, ZnO@MOF@PZS was prepared via hydrothermal and polycondensation methods. ZnO nanoflowers played the role as a template for growth of MOF@PZS and zinc source for formation of MOF. Subsequently, the obtained ZnO@MOF@PZS was mixed into polyurea (PUA) to investigate its flame retardancy and toxicity suppression properties. The cone calorimeter test (CCT) showed that ZnO@MOF@PZS significantly improved the flame retardancy of PUA composites. The addition of 3 wt% ZnO@MOF@PZS into PUA could result in peak heat release rate (PHRR), total heat release (THR) and total CO production (TCO) of 28.30%, 19.59% and 36.65%, respectively. The result of universal testing machine showed that ZnO@MOF@PZS-add PUA had better mechanical properties. It is notable that the improved flame retardant properties for PUA composites are mainly attributed to ZnO@MOF@PZS promoting the formation of dense char residue.

中文翻译：

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金属有机骨架衍生的ZnO@MOF@PZS阻燃剂降低聚脲纳米复合材料的火灾危害

近年来，过渡金属作为阻燃剂引起了人们的浓厚兴趣。在这项工作中，ZnO@MOF@PZS 通过水热和缩聚方法制备。ZnO 纳米花作为 MOF@PZS 生长的模板和 MOF 形成的锌源。随后，将获得的 ZnO@MOF@PZS 混合到聚脲 (PUA) 中以研究其阻燃和毒性抑制性能。锥形量热仪测试（CCT）表明，ZnO@MOF@PZS显着提高了PUA复合材料的阻燃性。将 3 wt% ZnO@MOF@PZS 添加到 PUA 中可导致峰值放热率 (PHRR)、总放热 (THR) 和总 CO 产量 (TCO) 分别为 28.30%、19.59% 和 36.65%。万能试验机结果表明ZnO@MOF@PZS-add PUA具有更好的力学性能。