Synergistic effect of piperazine pyrophosphate and epoxy-octavinyl silsesquioxane on flame retardancy and mechanical properties of epoxy resin
Synergistic effect of piperazine pyrophosphate and epoxy-octavinyl silsesquioxane on flame retardancy and mechanical properties of epoxy resin
复制标题
焦磷酸哌嗪与环氧辛乙烯基倍半硅氧烷对环氧树脂阻燃性能和力学性能的协同作用
DOI：
10.1016/j.compositesb.2021.109115
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发表时间：
2021-07-01
影响因子：
13.1
通讯作者：
Wang, Qi
中科院分区：
文献类型：
--
作者：
Li, Shansu;Liu, Yuan;Wang, Qi
为了解决环氧树脂阻燃性与力学性能之间的矛盾，采用哌嗪焦磷酸盐（PAPP）和环氧-八乙烯基倍半硅氧烷（EOVS）作为环氧树脂（EP）的阻燃剂。PAPP和EOVS的引入，使EP复合材料的阻燃性能、力学性能和抑烟性能得到显著提高。EP/9重量% PAPP/1重量% EOVS（EP 3）通过垂直燃烧（UL-94）测试V-0等级，并获得32.4%的极限氧指数（LOI）测试值。锥形量热仪（CC）测试结果表明，PAPP和EOVS的掺入显著降低了EP的总热释放量（THR）、峰值热释放量（PHRR）、总产烟量（TSP）和峰值产烟率（PSPR），分别比纯EP降低了25%、81%、57%和63%。采用扫描电子显微镜（SEM）、能谱仪（EDS）、激光拉曼光谱（LRS）、X射线光电子能谱（XPS）和热重-傅里叶变换红外光谱（TG-FTIR）等测试手段对PAPP/EOVS阻燃剂的阻燃机理进行了分析。结果表明，EP 3的阻燃性主要是由于其优良的成炭能力、不可燃气体的稀释作用和气态磷化合物的阻燃作用。此外，环氧基团和Si-O键的存在使EP 3的拉伸强度和冲击强度提高。本文提出了一种制备机械增强阻燃环氧树脂的新方法。
In order to solve the contradiction between the flame retardancy and mechanical properties of epoxy resin, piperazine pyrophosphate (PAPP) and epoxy-octavinyl silsesquioxane (EOVS) are applied as flame retardants for epoxy resin (EP). With the introduction of PAPP and EOVS, the properties of the EP composites about flame retardancy, mechanical properties and smoke suppression are significantly improved. EP/9 wt% PAPP/1 wt% EOVS (EP3) passes a vertical burning (UL-94) test V-0 rating and acquires the limiting oxygen index (LOI) test value of 32.4%. The results of cone calorimeter (CC) tests confirm that the incorporation of PAPP and EOVS significantly reduces the total heat release (THR), peak heat release (PHRR), total smoke production (TSP) and peak smoke produce rate (PSPR) values, which are respectively decreased by 25%, 81%, 57% and 63% compared with those of pure EP. Scanning electron microscope (SEM), energy dispersive spectrometry (EDS), Laser Raman spectroscopy (LRS), X-ray photoelectron spectroscopy (XPS) and Thermogravimetry-Fourier transform infrared (TG-FTIR) spectroscopy are adopted to analyze the flame-retardant mechanism of PAPP/EOVS flame retardants. These results reveal that the flame retardancy of EP3 is attributed to the excellent charring ability, the dilution effect of non-combustible gases and the flame inhibition of gaseous phosphorous compounds. Besides, the tensile and impact strength of EP3 increase benefitting from the presence of epoxy groups and Si-O bonds in EOVS. This work proposes a new method to prepare the mechanically reinforced and flame-retardant epoxy resin.