Lan Jiashui, Li Dingsi, Zhong Wei, Luo Wenhui, Zhang Huagui, Chen Mingfeng
Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
Research and Development Department, Waexim (Xiamen) New Materials Co., Ltd., Xiamen 361023, China.
Molecules. 2023 Jul 12;28(14):5354. doi: 10.3390/molecules28145354.
As an important thermosetting material, flame-retardant epoxy resin has various applications in the aerospace, chemical, and electronics industry, and other fields. However, the flame retardancy of epoxy resins is often improved at the expense of mechanical performance. The contradiction between flame retardancy and mechanical properties seriously impedes the practical applications of epoxy resin (EP). Herein, iron-loaded polydopamine functionalized montmorillonite (D-Mt-Fe), which was prepared by dopamine, iron chloride and montmorillonite in an aqueous solution, was introduced to prepare iron-loaded polydopamine functionalized montmorillonite/epoxy resin composites (D-Mt-Fe/EP). As expected, D-Mt-Fe/EP-10 with 10 phr of D-Mt-Fe passed the UL-94 V-0 rating, achieved a limiting oxygen index (LOI) value of 31.0% and reduced the smoke production rate (SPR) and total smoke production (TSP), indicating that the introduction of D-Mt-Fe could endow EP with satisfactory flame retardancy through the radical scavenging function of dopamine in the gas phase and the catalytic charring effect of iron ions, respectively. Encouragingly, the mechanical property was also enhanced with the flexural strength increased by 25.5%. This work provided an attractive strategy for improving both the mechanical properties and fire resistance of EP, which greatly broadened their applications in the chemical industry and electronics field, etc.
作为一种重要的热固性材料，阻燃环氧树脂在航空航天、化工和电子工业等领域有着广泛的应用。然而，环氧树脂的阻燃性通常是以牺牲机械性能为代价来提高的。阻燃性与机械性能之间的矛盾严重阻碍了环氧树脂（EP）的实际应用。在此，通过多巴胺、氯化铁和蒙脱石在水溶液中制备了负载铁的聚多巴胺功能化蒙脱石（D-Mt-Fe），并将其引入以制备负载铁的聚多巴胺功能化蒙脱石/环氧树脂复合材料（D-Mt-Fe/EP）。正如预期的那样，含有10 phr D-Mt-Fe的D-Mt-Fe/EP-10通过了UL-94 V-0等级测试，极限氧指数（LOI）值达到31.0%，并降低了产烟速率（SPR）和总产烟量（TSP），这表明引入D-Mt-Fe可分别通过气相中多巴胺的自由基清除功能和铁离子的催化成炭作用赋予EP令人满意的阻燃性。令人鼓舞的是，机械性能也得到了增强，弯曲强度提高了25.5%。这项工作为同时提高EP的机械性能和耐火性提供了一种有吸引力的策略，极大地拓宽了它们在化工和电子领域等的应用。
