Duan Zunbin, Wang Yanfang, Bian Shi, Liu Danni, Zhang Yanli, Zhang Xue, He Rui, Wang Jiahong, Qu Guangbo, Chu Paul K, Yu Xue-Feng
Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Nanoscale. 2022 Feb 17;14(7):2599-2604. doi: 10.1039/d1nr08350c.
Two-dimensional black phosphorus (BP) nanosheets are potential flame-retardant nano-additives. Herein, the effects of the size of BP nanosheets embedded in epoxy resin (EP) on flame retardancy are studied. BP nanosheets with four different sizes are synthesized from bulk BP by different exfoliation methods including solid ball milling, liquid ball milling, ultrasonic liquid exfoliation, and electrochemical exfoliation (samples are designated as sb-BP, lb-BP, us-BP, and ec-BP, respectively). lb-BP exhibits the best dispersion in the EP matrix, and the lb-BP/EP composite shows the best flame-retardancy properties among the four BP/EP composites. Compared to bare EP, lb-BP/EP shows obvious improvements including the reduction in the heat release peak rate by 34.4%, total heat release by 27.0%, peak of smoke production rate by 69.2%, and total production of carbon monoxide by 50.8%. The mechanistic study reveals that lb-BP serves as a barrier and carbonization catalyst to delay combustion. These results confirm the size dependence of flame-retardancy properties of BP nanosheets and the new knowledge provides insights into the size dependent effects of other two-dimensional materials.
二维黑磷（BP）纳米片是潜在的阻燃纳米添加剂。在此，研究了环氧树脂（EP）中嵌入的BP纳米片尺寸对阻燃性的影响。通过不同的剥离方法，包括固体球磨、液体球磨、超声液体剥离和电化学剥离，从块状BP合成了四种不同尺寸的BP纳米片（样品分别命名为sb-BP、lb-BP、us-BP和ec-BP）。lb-BP在EP基体中表现出最佳的分散性，并且lb-BP/EP复合材料在四种BP/EP复合材料中表现出最佳的阻燃性能。与纯EP相比，lb-BP/EP有明显的改善，包括热释放峰值速率降低34.4%、总热释放降低27.0%、烟生成速率峰值降低69.2%以及一氧化碳总生成量降低50.8%。机理研究表明，lb-BP作为屏障和碳化催化剂来延迟燃烧。这些结果证实了BP纳米片阻燃性能的尺寸依赖性，并且这一新知识为其他二维材料的尺寸依赖性效应提供了见解。
