Xie Weiqi, Huang Shiwen, Tang Donglin, Liu Shumei, Zhao Jianqing
School of Materials Science and Engineering, South China University of Technology Guangzhou 510640 P. R. China
Key Laboratory of Polymer Processing Engineering, Ministry of Education Guangzhou 510640 P. R. China.
RSC Adv. 2020 Jan 9;10(4):1956-1965. doi: 10.1039/c9ra06425g. eCollection 2020 Jan 8.
A furfural-based DOPO-containing flame retardant, 6,6'-(((methylenebis(4,1-phenylene))bis(azanediyl))bis(furan-2-ylmethylene))bis(dibenzo[,][1,2]oxaphosphinine 6-oxide) (MBF-DOPO), was synthesized and utilized as a co-curing agent of 4,4'-diaminodiphenyl methane (DDM) for fire-safe epoxy thermosets. For the cured epoxy resin containing 4.0% MBF-DOPO, the limiting oxygen index (LOI) reached 32.9% (with the V-0 rating in UL-94 test), and the peak heat release rate and total smoke production values were respectively decreased by 29.3% and 33.6%, compared to pure epoxy resin. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) results confirmed that the furfural-based flame retardant MBF-DOPO promoted the charring formation of the epoxy matrix, which effectively isolated the gas and heat transfer during combustion and thus enhanced the fire-safety performance of the epoxy thermosets. This work provides an effective route for synthesizing a furfural-based flame retardant, which possesses great potential for application in fire-safe epoxy thermosets.
合成了一种基于糠醛的含DOPO阻燃剂6,6'-(((亚甲基双(4,1-亚苯基))双(氮杂二亚基))双(呋喃-2-基亚甲基))双(二苯并[,][1,2]氧杂磷杂环庚烷6-氧化物)(MBF-DOPO)，并将其用作4,4'-二氨基二苯甲烷(DDM)的共固化剂，用于制备具有防火性能的环氧热固性材料。对于含有4.0%MBF-DOPO的固化环氧树脂，其极限氧指数(LOI)达到32.9%(在UL-94测试中达到V-0等级)，与纯环氧树脂相比，峰值热释放速率和总烟雾生成量分别降低了29.3%和33.6%。扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)结果证实，基于糠醛的阻燃剂MBF-DOPO促进了环氧基体的炭化形成，有效隔离了燃烧过程中的气体和热传递，从而提高了环氧热固性材料的防火性能。这项工作为合成一种基于糠醛的阻燃剂提供了一条有效途径，该阻燃剂在防火环氧热固性材料中具有巨大的应用潜力。
