Effect of a novel P/N/S-containing reactive flame retardant on curing behavior, thermal and flame-retardant properties of epoxy resin
Effect of a novel P/N/S-containing reactive flame retardant on curing behavior, thermal and flame-retardant properties of epoxy resin
复制标题
新型含P/N/S反应型阻燃剂对环氧树脂固化行为、热性能和阻燃性能的影响
DOI：
10.1016/j.jaap.2017.07.014
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发表时间：
2017-09-01
影响因子：
6
通讯作者：
Zheng, Xuelin
中科院分区：
文献类型：
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作者：
Jian, Rongkun;Wang, Pan;Zheng, Xuelin
以9, 10-二氢-9-氧杂-10-磷杂菲-10-氧化物、对羟基苯甲醛和2-氨基噻唑为原料合成了一种新型含P/N/S的阻燃剂DHBAZ，并将其用作环氧树脂（EP）的共固化剂。在DHBAZ的帮助下，EP/7.5% DHBAZ通过了UL-94 V-0评级，LOI值为31.4%。此外，DHBAZ对于抑制热量的释放和烟雾的产生也起到了积极的作用。通过非等温DSC测试表明，在DHBAZ存在下，环氧树脂可以在较低的温度下固化，并且表现出较低的固化反应活性能。 DMA 分析表明，EP/7.5% DHBAZ 显示出较高的储能模量，并且其玻璃化转变温度与 EP 接近。同时，从 TG 分析中得出，DHBAZ 对环氧树脂的热稳定性影响较小。最后，通过TG-FTIR和py-GC/MS研究的阻燃机理推断，DHBAZ在气相中通过产生P中心点、PO中心点和不燃气体发挥作用。
A novel P/N/S-containing flame retardant DHBAZ was synthesized with 9, 10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, p-hydroxybenzaldehyde and 2-aminothiazole, and used as a co-curing agent for epoxy resin (EP). With the aid of DHBAZ, EP/7.5% DHBAZ passed UL-94 V-0 rating, and owned a LOI value of 31.4%. Besides, DHBAZ also played a positive role in inhibiting the release of heat and the production of smoke. Through non-isothermal DSC tests it revealed that in the presence of DHBAZ, epoxy resin was cured at a lower temperature and showed lower curing-reaction activity energy. DMA analyses indicated that EP/7.5% DHBAZ showed an increased storage modulus, and it had a close glass transition temperature with EP. While, DHBAZ presented a decreased effect on the thermal stability of epoxy resin acquired from TG analyses. Finally, the flame-retardant mechanism studied by TG-FTIR and py-GC/MS deduced that DHBAZ worked in the gaseous phase by producing P center dot, PO center dot and incombustible gases.