Assembly of phytic acid-Ni2+ via bionic poly-dopamine-mediated to construct a core-shell MgCO3 for fire-safe EVA composites

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-03-10 DOI:10.1016/j.coco.2025.102340

Xiaojing Duan , Jiachen Zhu , Chenyang Li , Huidong Fang , Wanji Zhou , Shiai Xu

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引用次数: 0

Abstract

A mussel-inspired polydopamine-assisted layer-by-layer assembly combined with a metal-chelating strategy using phytic acid was employed to synthesize a novel multi-level core-shell magnesium carbonate-based flame retardant (AMC@PDA@PA-Ni) for enhancing the fire safety of ethylene vinyl acetate (EVA) copolymers. The incorporation of 50 wt% AMC@PDA@PA-Ni increased the LOI of the EVA composite to 30.3 %, achieving a UL94 V-1 rating. Compared to pristine EVA, the composite exhibited a 63.3 % reduction in peak heat release rate (pHRR) and a 66.7 % decrease in peak smoke release rate (pSPR). At elevated temperatures, the combined effects of AMC's gas-solid phase flame retardancy, the phosphorus-containing flame retardant's quenching action, and the transition metal nickel's catalytic charring capability significantly contributed to the composite's superior fire resistance. Additionally, the tensile strength of the EVA/AMC@PDA@PA-Ni composite increased by 97.6 % relative to EVA/AMC, attributed to the PDA modification, which enhanced filler dispersion and interfacial adhesion. This study introduces a facile and effective strategy for developing bio-based multi-level core-shell hybrid flame retardants with outstanding fire resistance and mechanical strength retention.

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研究人员采用贻贝启发的多巴胺辅助逐层组装技术，结合植酸金属螯合策略，合成了一种新型多级核壳碳酸镁基阻燃剂（AMC@PDA@PA-Ni），用于提高乙烯-醋酸乙烯（EVA）共聚物的防火安全性。50 wt% AMC@PDA@PA-Ni 的加入将 EVA 复合材料的 LOI 提高到 30.3%，达到了 UL94 V-1 等级。与原始 EVA 相比，该复合材料的峰值热释放率 (pHRR) 降低了 63.3%，峰值烟释放率 (pSPR) 降低了 66.7%。在高温条件下，AMC 的气固相阻燃性、含磷阻燃剂的淬火作用以及过渡金属镍的催化炭化能力共同作用，显著提高了复合材料的耐火性能。此外，与 EVA/AMC 相比，EVA/AMC@PDA@PA-Ni 复合材料的拉伸强度提高了 97.6%，这归功于 PDA 改性增强了填料分散性和界面粘附性。这项研究为开发具有出色耐火性和机械强度保持性的生物基多层次核壳混合阻燃剂提供了一种简便有效的策略。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.