Natural halloysite nanotubes decorated with organophosphorous for highly flame-resistant epoxy composites

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2024-01-15 DOI:10.1002/vnl.22088

Li Ruan, Dechao Hu, Wenshi Ma

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引用次数: 0

Abstract

Highly flame-resistant epoxy composites have important application value in many industrial fields. Unfortunately, epoxy resins (EPs) are inherently flammable materials and exhibit great fire hazard. In this study, the commercially available 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was chemically immobilized on the surface of natural halloysite nanotubes (HNTs) via the linkage of vinyltrimethoxysilane to obtain a novel flame-retardant VD@HNTs containing P/Si/Al elements. It was found that the flame-retardant VD@HNTs can effectively improve the thermal stability and flame resistance of epoxy composites. Typically, when 10% of VD@HNTs is added in EP, the limiting oxygen index of as-prepared VD@HNTs/EP composites reaches 30.3%, and it also successfully reaches V-0 classification in the UL-94 test. Besides, the ignition time of VD@HNTs/EP composites was enhanced from 42 s for pure EP to 60 s, and the maximum heat release rate was reduced from 1221 to 758 kW∙m⁻². These great findings promise an innovative and efficient strategy for improving the fire safety of EP products and may also offer valuable insight toward fabricating various novel organic–inorganic flame retardants as well as highly flame-resistant polymer composites.

Highlights

A novel flame-retardant VD@HNTs containing P/Si/Al elements was prepared by the chemical decoration of HNTs with organophosphorous.
The VD@HNT can effectively improve the thermal stability and flame resistance of epoxy composites.
Synergistic flame-retardant mechanism of phosphorus-based flame retardants and natural HNTs was classified.

Abstract Image

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用有机磷装饰的天然埃洛石纳米管用于高阻燃环氧树脂复合材料

高阻燃环氧复合材料在许多工业领域都具有重要的应用价值。遗憾的是，环氧树脂（EP）本身是易燃材料，具有很大的火灾危险性。本研究通过乙烯基三甲氧基硅烷将市售的 9,10-二氢-9-氧杂-10-磷菲-10-氧化物（DOPO）化学固定在天然海泡石纳米管（HNTs）表面，从而获得了含有 P/Si/Al 元素的新型阻燃 VD@HNTs。研究发现，阻燃 VD@HNTs 能有效提高环氧树脂复合材料的热稳定性和阻燃性。通常，在 EP 中添加 10% 的 VD@HNTs 后，制备的 VD@HNTs/EP 复合材料的极限氧指数可达 30.3%，在 UL-94 测试中也成功达到 V-0 级。此外，VD@HNTs/EP 复合材料的点火时间从纯 EP 的 42 秒延长到 60 秒，最大放热率从 1221 kW∙m-2 降低到 758 kW∙m-2 。这些重大发现为提高 EP 产品的防火安全性提供了一种创新而有效的策略，同时也为制造各种新型有机-无机阻燃剂以及高阻燃聚合物复合材料提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.