Silane-modified magnesium oxide synergized with diphenyl chlorophosphate for high thermal conductivity and flame-retardant epoxy composites

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-10-15 DOI:10.1016/j.coco.2025.102617

Yanan Li, Qinting Su, Yang Leng, Peixiao Sun, Xu Han, Miaojun Xu, Xiaoli Li, Bin Li

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引用次数: 0

Abstract

The rapid development of high-power electronic devices has made a great demand for epoxy resin (EP) composites with excellent thermal conductivity, fire safety, and low toxicity. Herein, a 3-aminopropyltriethoxysilane (KH-550)-magnesium oxide (MgO) (k-MgO) was constructed by one-step modification of magnesium oxide through silane coupling agent and a multifunctional additive diphenyl chlorophosphate (DCP)-k-MgO (D-k-MgO) was constructed by hydrogen bonding with DCP to meet the above requirements. The flame retardant epoxy resin composites (EP/k-MgO and EP/D-k-MgO) were further prepared by k-MgO and D-k-MgO as the flame retardant and 4,4′-diaminodiphenylmethane (DDM) as a curing substance. At a loading of 45 wt%, the EP/k-MgO composites exhibited a thermal conductivity of 1.078 W m⁻¹ K⁻¹, representing a 304 % enhancement over pure EP. The addition of 18 wt% D-k-MgO (DCP:k-MgO = 10:8 wt%) achieved a UL-94 V-0 rating and increased the limiting oxygen index to 36.6 %, due to the synergistic effects of DCP and MgO in both gas and condensed phases. Cone calorimeter testing revealed a 53.5 %, 38 %, 23.3 %, and 76.3 % decrease in the peak heat release rate (pHRR), total heat release (THR), carbon monoxide production (COP), and carbon dioxide production (CO₂P) of EP/D-k-MgO, respectively, compared to EP. The release of hazardous products, including carbon monoxide and carbon dioxide, for EP/D-k-MgO visibly declined during combustion. This work established a multifunctional additive that reconciles high thermal management with stringent fire-safety requirements, offering a scalable route for next-generation high-power electronic encapsulants.

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硅烷改性氧化镁与氯磷酸二苯酯协同制备高导热阻燃环氧复合材料

大功率电子器件的快速发展，对导热性好、防火安全、毒性低的环氧树脂（EP）复合材料提出了巨大的需求。本研究通过硅烷偶联剂对氧化镁进行一步改性，构建了3-氨基丙基三乙氧基硅烷(KH-550)-氧化镁（k-MgO），并与DCP通过氢键形成了满足上述要求的多功能添加剂二苯氯磷酸(DCP)-k-MgO （D-k-MgO）。以k-MgO和D-k-MgO为阻燃剂，以4,4′-二氨基二苯甲烷（DDM）为固化剂，进一步制备了EP/k-MgO和EP/D-k-MgO阻燃环氧树脂复合材料。在负载为45 wt%时，EP/ K - mgo复合材料的导热系数为1.078 W m−1 K−1，比纯EP提高了304%。由于DCP和MgO在气相和凝聚相中的协同作用，添加18 wt%的D-k-MgO （DCP:k-MgO = 10:8 wt%）达到了UL-94的V-0等级，并将极限氧指数提高到36.6%。锥形量热计测试显示，与EP相比，EP/D-k-MgO的峰值放热率（pHRR）、总放热率（THR）、一氧化碳产出量（COP）和二氧化碳产出量（CO2P）分别降低了53.5%、38%、23.3%和76.3%。在燃烧过程中，EP/D-k-MgO的一氧化碳和二氧化碳等有害物质的释放量明显下降。这项工作建立了一种多功能添加剂，可以协调高热管理和严格的防火安全要求，为下一代大功率电子封装剂提供了可扩展的途径。

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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.