A compound containing phosphorus-rich arcuate structure towards improving fire safety and toughness, and maintaining transparency of epoxy resins

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

Composites Communications Pub Date : 2025-04-10 DOI:10.1016/j.coco.2025.102386

Shuxian Zheng, Shuyang Shi, Kun Zeng, Xuexiang Zhou, Luzhi Zhou, Wenhui Rao, Chuanbai Yu

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引用次数: 0

Abstract

It is of great significance that the flame retardancy of EP composites was enhanced while concurrently improving or maintaining their thermal stability, toughness, and transparency to fulfill the demands of epoxy resins in special fields. In this study, by using the Schiff base reaction and electrophilic dehydrogenation, a new compound containing a phosphorus-rich arcuate structure (DND) was effectively synthesized. DND possessed high P-containing content (8.7 %), an arcuate structure, and active hydroxyl and secondary amine groups, endowing its better interface compatibility and comprehensive performance improvement for EP. Nuclear magnetic resonance (NMR) and infrared spectroscopy (FTIR) were used to discover the chemical structure of DND. Subsequently, the incorporation of DND in matrix resin modified the comprehensive performance of EP composites. By introducing 3 wt% DND, the LOI value of EP/DND-3 rose from 23.8 % of EP to 30.6 %, and it achieved a UL-94 V-0 rating. In contrast to EP, the peak heat release rate (PHRR) and total heat release peak (THR) of EP/DND-3 reduced by 30.7 % and 26.5 %, respectively. Furthermore, compared with pure EP, EP/DND composites also had good toughness, the impact strength of EP/DND-1 rose by 166 %. Glass transition temperature, flexural strength, and modulus of EP/DND-3 composites were all markedly enhanced. Most surprisingly, the visible light transmittance of EP/DND composites was consistent with that of pure EP. The new structure of flame retardant is designed to offer an alternative for high-performance flame-retardant polymer composites.

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一种含有富磷弧形结构的化合物，用于提高环氧树脂的防火安全性和韧性，并保持其透明度

增强EP复合材料的阻燃性，同时提高或保持其热稳定性、韧性和透明度，对满足环氧树脂在特殊领域的需求具有重要意义。本研究利用希夫碱反应和亲电脱氢，有效合成了一种富磷弓形结构（DND）的新化合物。DND具有较高的p含量（8.7%）、弧形结构、活性羟基和仲胺基团，具有较好的界面相容性和EP的综合性能改善。利用核磁共振（NMR）和红外光谱（FTIR）研究了DND的化学结构。随后，在基体树脂中掺入DND对EP复合材料的综合性能进行了改性。通过添加3 wt%的DND， EP/DND-3的LOI值从EP的23.8%提高到30.6%，达到UL-94 V-0等级。与EP相比，EP/DND-3的峰值放热率（PHRR）和总放热峰（THR）分别降低了30.7%和26.5%。与纯EP相比，EP/DND-1复合材料也具有良好的韧性，冲击强度提高了166%。EP/DND-3复合材料的玻璃化转变温度、抗弯强度和模量均显著提高。最令人惊讶的是，EP/DND复合材料的可见光透过率与纯EP一致。新型阻燃剂结构的设计为高性能阻燃聚合物复合材料提供了一种替代方案。

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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.