The NiMo/Mg(OH)₂ (NMM) hybrid as an efficient flame retardancy and smoke suppression composite for polypropylene (PP) was synthesized through NiMo co‐precipitation on the surface of Mg(OH)₂ (MH) hexagonal nanosheets. Compared to PP/MH, PP/NMM exhibited excellent smoke suppressing and flame retardancy on the heat release rate, total heat release, smoke production rate, total smoke production, CO production rate and total CO production with the same loading. The reduced hazard of PP/NMM was mainly attributed to the high physical barrier effect of compact char residues on heat, smoke and combustible gas. The mechanism study indicated that multiwalled carbon nanotubes (MWCNTs) generated from the catalytic carbonization of PP by the NiMo compound could play the role of “rebar” to strengthen the char residues, avoid the generation of cracks and form highly compact char layer. Furthermore, MgO could facilitate the production of MWCNTs through changing the pyrolysis process of PP and increasing the reaction time between pyrolysis gas and NiMo compound. Hence, the new NiMo/MH catalyst hybrid may explore the potential for solving the tough problem of the flammability and heavy smoke of the polyolefins system.

中文翻译：

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抑制烟气和形成Ni ？的炭的效果很高 聚丙烯的Mo / Mg（OH）2

在Ni 沫/镁（OH）₂（NMM）混合作为一种高效的阻燃性和抑烟复合为聚丙烯（PP）通过镍合成沫共沉淀的Mg（OH）的表面上的₂（MH）的六边形纳米片。与PP / MH相比，PP / NMM在相同负荷下的放热速率，总放热，烟雾产生率，总烟雾产生量，CO产生速率和CO产生量均表现出优异的抑烟和阻燃性。PP / NMM的降低的危害主要归因于紧密的焦炭残留物对热，烟和可燃气体的高物理屏障作用。机理研究表明，Ni催化PP碳化产生了多壁碳纳米管。钼化合物可以起到“钢筋”的作用，以增强炭残留物，避免产生裂纹并形成高度致密的炭层。此外，MgO可以通过改变PP的热解过程和增加热解气体与NiMo化合物之间的反应时间来促进MWCNT的生产。因此，新型的NiMo / MH催化剂杂化物可以探索解决聚烯烃系统可燃性和浓烟这一棘手问题的潜力。