Synthesis of a tris(DOPO-grafted piperazine)-triazine phosphoramide and its application as a highly efficient flame retardant for epoxy resins

IF 3 3区工程技术 Q2 CHEMISTRY, ANALYTICAL

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-08-17 DOI:10.1007/s10973-024-13508-7

Gang Tang, Yang Hu, Yuan Fang, Mengfan Guan, Zedong Gong, Guodong Wang, Dan Deng, Xiuyu Liu

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引用次数: 0

Abstract

A tris(DOPO-grafted piperazine)-triazine phosphoramide (DOPO-TPT) was synthesized, and its structure was well characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. DOPO-TPT was used as a flame retardant additive to modify the epoxy resin to obtain a series of flame retardant epoxy thermosets. The effects of DOPO-TPT on the thermomechanical properties, thermal stability and flame retardancy of the resulting epoxy thermosets were investigated. The results showed that when the addition of DOPO-TPT was 5 mass% (phosphorus content was 0.47 mass%), the limiting oxygen index of the epoxy thermoset reached 30.0%, and it passed the UL-94 V-0 classification. Compared with unmodified epoxy resin, the maximum heat release rate and total heat release of EP/DOPO-TPT-5.0 decreased by 28% and 20%, respectively. Additionally, the presence of DOPO-TPT did not deteriorate the thermomechanical properties of the resulting epoxy thermosets. TG-FTIR test confirmed that the incorporation of DOPO-TPT could significantly inhibit the release of gaseous products. The char layer analysis results showed that DOPO-TPT had good catalytic charring performance, which was conducive to decreasing the escape of combustible gas during combustion, thus improving the flame retardancy.

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三(DOPO接枝哌嗪)-三嗪磷酰胺的合成及其作为环氧树脂高效阻燃剂的应用

合成了一种三（DOPO接枝哌嗪）-三嗪磷酰胺（DOPO-TPT），并通过傅立叶变换红外光谱和核磁共振光谱对其结构进行了表征。利用 DOPO-TPT 作为阻燃添加剂对环氧树脂进行改性，得到了一系列阻燃环氧热固性树脂。研究了 DOPO-TPT 对所得环氧热固性材料的热力学性质、热稳定性和阻燃性的影响。结果表明，当 DOPO-TPT 的添加量为 5 质量%（磷含量为 0.47 质量%）时，环氧热固性塑料的极限氧指数达到 30.0%，并通过了 UL-94 V-0 分级。与未改性环氧树脂相比，EP/DOPO-TPT-5.0 的最大热释放率和总热释放率分别降低了 28% 和 20%。此外，DOPO-TPT 的存在并没有降低所得环氧热固性树脂的热机械性能。TG-FTIR 测试证实，DOPO-TPT 的加入能显著抑制气态产物的释放。炭层分析结果表明，DOPO-TPT 具有良好的催化炭化性能，有利于减少燃烧过程中可燃气体的逸出，从而提高阻燃性能。

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来源期刊

Journal of Thermal Analysis and Calorimetry 化学-分析化学

CiteScore

8.50

自引率

9.10%

发文量

577

审稿时长

3.8 months

期刊介绍： Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.