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A novel DOPO-based flame retardant containing benzimidazolone structure with high charring ability towards low flammability and smoke epoxy resins
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2020-11-09 , DOI: 10.1016/j.polymdegradstab.2020.109426
Hao Wang , Shan Li , Zongmin Zhu , Xianze Yin , Luoxin Wang , Yunxuan Weng , Xuyi Wang

A novel flame retardant POBDBI was generated by the reaction of p-dibenzaldehyde, 5-amino-2-benzimidazolinone and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), and employed to epoxy resin. The structure of POBDBI was measured by FT-IR and NMR tests. Then flame-retardant EP was fabricated by using POBDBI as a flame-retardant. The thermal stability, flame-retardant performance and fire behavior were investigated by a serious of comprehensive instruments. Combustion tests show the flame-retardant performance of composite materials has been significantly improved. For example, the EP/POBDBI-1.0 with the phosphorus content of 1.0% accorded a V-0 rating and its limiting oxygen index (LOI) value increased to 36.5%. Besides, total smoke production (TSP), peak heat release rate (PHRR) and total heat release (THR) of EP/POBDBI-1.0 dropped significantly, and the corresponding values were decreased by 48.4%, 48.9% and 8.7%, respectively. At the same time, the composition, morphology of chars and gaseous products of POBDBI were studied by X-ray photoelectron spectroscopy (XPS), FT-IR, scanning electron microscope (SEM) and Py-GC/MS. These results presented that POBDBI could not only exerted free radical capture effect, but also enhanced the density of char residue.



中文翻译:

一种新型的基于DOPO的阻燃剂,其含有苯并咪唑酮结构,对低易燃性具有高炭化能力,并具有烟雾环氧树脂

通过对二苯甲醛,5-氨基-2-苯并咪唑啉酮和9,10-二氢-9-氧杂-10-磷菲并十氧化物(DOPO)的反应生成了新型的阻燃剂POBDBI,并将其用于环氧树脂。POBDBI的结构通过FT-IR和NMR测试测量。然后通过使用POBDBI作为阻燃剂来制备阻燃EP。通过一系列综合仪器对热稳定性,阻燃性能和防火性能进行了研究。燃烧试验表明,复合材料的阻燃性能已得到明显提高。例如,磷含量为1.0%的EP / POBDBI-1.0符合V-0等级,其极限氧指数(LOI)值增至36.5%。此外,EP / POBDBI-1的总烟雾量(TSP),峰值放热率(PHRR)和总放热(THR)。0显着下降,相应的值分别下降48.4%,48.9%和8.7%。同时,通过X射线光电子能谱(XPS),傅立叶变换红外光谱(FT-IR),扫描电子显微镜(SEM)和Py-GC / MS研究了POBDBI的炭和气态产物的组成,形态。这些结果表明,POBDBI不仅可以发挥自由基捕获作用,而且可以提高炭渣的密度。

更新日期:2020-11-09
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