Bioinspired iron-loaded polydopamine nanospheres as green flame retardants for epoxy resin via free radical scavenging and catalytic charring†,Journal of Materials Chemistry A

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Bioinspired iron-loaded polydopamine nanospheres as green flame retardants for epoxy resin via free radical scavenging and catalytic charring†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-18 , DOI: 10.1039/c9ta11021f
Lu Zhang _{1,

2,

3,

4,

5} , Qi Wang _{1,

2,

3,

4,

5} , Rong-Kun Jian _{1,

2,

3,

6,

7} , De-Yi Wang _{1,

2,

3}

Affiliation

The versatile coating capability of polydopamine (PDA) has received much research interest in numerous fields, including flame retardant functionalization of fillers for polymers. However, the understanding of flame retardant actions of PDA materials in combustion still remains incomplete, limiting its practical applications and future designs as polymer reinforcing fillers. In this study, iron-loaded polydopamine (Fe-PDA) nanospheres were introduced into epoxy resin (EP) as green flame retardant additives. The resultant EP nanocomposites exhibited remarkably reduced flammability, reflected by the high LOI value of 31.6%, V-0 rating in the UL-94 test, as well as a 41% reduction in the peak heat release rate at 5 wt% Fe-PDA loading. More importantly, for the first time, it is clearly revealed that the flame inhibition action in the gas phase was owing to the free radical scavenging ability of Fe-PDA. In addition to the gas phase action, Fe-PDA also promoted the charring process in the condensed phase, leading to the formation of integrated char layers that effectively delayed the mass and heat transfer of combustion. Based on these actions (free radical scavenging and catalytic charring), Fe-PDA acted as the nontoxic and highly efficient flame retardant in EP.

中文翻译：

生物启发的铁负载聚多巴胺纳米球通过自由基清除和催化炭化作为环氧树脂的绿色阻燃剂†

聚多巴胺（PDA）的通用涂层能力已在许多领域引起了很多研究兴趣，包括聚合物填料的阻燃功能化。然而，对PDA材料在燃烧中的阻燃作用的了解仍然不完整，限制了其实际应用和作为聚合物增强填料的未来设计。在这项研究中，将铁负载的聚多巴胺（Fe-PDA）纳米球作为绿色阻燃添加剂引入到环氧树脂（EP）中。所得的EP纳米复合材料显示出显着降低的可燃性，这反映在31.6％的高LOI值，UL-94测试中的V-0等级以及5 wt％的Fe-PDA的峰值放热率降低了41％的情况下加载中。更重要的是，这是第一次清楚地表明，气相中的火焰抑制作用归因于Fe-PDA的自由基清除能力。除气相作用外，Fe-PDA还促进了冷凝相中的炭化过程，从而导致形成了集成炭层，有效地延迟了燃烧的质量和传热。基于这些作用（自由基清除和催化炭化），Fe-PDA在EP中充当了无毒和高效的阻燃剂。

更新日期：2020-01-13

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