Manganese dioxide (MnO₂) as a promising green material has attracted widely attention in virtue of its outstanding chemical and physical properties. Herein, MnO₂ nanosheets with α- and δ- crystal structures were used to comparatively study the influence of crystal structures on the fire resistance of EP resin. Cone calorimeter results confirmed that δ-MnO₂ nanosheets achieved better improvements than α-MnO₂ nanosheets in reducing the PHRR and THR values as well as suppressing smoke release during combustion process. Moreover, Raman data and SEM tests showed that δ-MnO₂ nanosheets could effectively promote the char dense of char residues of EP composites. TG-IR results also indicated that the pyrolysis toxic products were significantly decreased after the incorporation of δ-MnO₂ nanosheets. By the way, the mechanical property of EP/δ-MnO₂ 2% composites had no obvious reduction compared with pristine EP resin, which would not restrict the application of EP resin in fields requiring high mechanical properties.

二氧化锰（MnO ₂）作为一种有前途的绿色材料，因其出色的化学和物理性能而受到了广泛的关注。在此，使用具有α-和δ-晶体结构的MnO ₂纳米片来比较研究晶体结构对EP树脂耐火性的影响。锥形量热结果证实，δ-的MnO ₂纳米片比α-MnO的实现更好的改进_2个在降低PHRR和THR值，以及在燃烧过程抑制烟雾释放纳米片。此外，拉曼数据和SEM测试表明，δ-的MnO ₂纳米片可以有效地促进EP复合材料炭渣的炭密。TG-IR结果还表明，热解有毒产物δ-MnO的掺入之后显著降低₂纳米片。顺便说一下，与原始EP树脂相比，EP /δ-MnO2 ₂％复合材料的机械性能没有明显降低，这不会限制EP树脂在要求高机械性能的领域中的应用。