Xu Wenzong, Wang Guisong, Liu Yucheng, Chen Rui, Li Wu
School of Materials Science and Chemical Engineering, Anhui Jianzhu University 292 Ziyun Road Hefei Anhui 230601 People's Republic of China
RSC Adv. 2018 Jan 11;8(5):2575-2585. doi: 10.1039/c7ra12816a. eCollection 2018 Jan 9.
A material (ZIF-8@SiO) with a nuclear shell structure was synthesized to improve the flame retardancy and smoke suppression of epoxy resin (EP) through a synergetic catalytic effect. Zeolitic imidazolate framework-8 (ZIF-8) was synthesized and its surface was coated with SiO by hydrolyzing tetraethyl orthosilicate. Core-shell structured ZIF-8@SiO was obtained. Then ZIF-8@SiO was added to EP to explore its effect of flame retardancy and smoke suppression on the EP composite. The results of a cone calorimeter test showed that the peak heat release rate, total heat release, smoke production rate and total smoke production of the material were decreased by 75.9%, 38.9%, 51.1% and 39.8%, respectively, after 2 wt% ZIF-8@SiO was added to EP. Besides, through the analysis of char residue, the mechanism of ZIF-8@SiO/EP's flame retardancy and smoke suppression was determined to be due to the physical barrier effect of SiO and the co-effect of SiO and ZnO decomposition by ZIF-8.
通过协同催化作用合成了一种具有核壳结构的材料（ZIF-8@SiO），以提高环氧树脂（EP）的阻燃性和抑烟性。合成了沸石咪唑酯骨架-8（ZIF-8），并通过水解正硅酸四乙酯在其表面包覆SiO，得到核壳结构的ZIF-8@SiO。然后将ZIF-8@SiO添加到EP中，以探究其对EP复合材料的阻燃和抑烟效果。锥形量热仪测试结果表明，在EP中添加2 wt%的ZIF-8@SiO后，材料的热释放峰值速率、总热释放量、产烟速率和总产烟量分别降低了75.9%、38.9%、51.1%和39.8%。此外，通过对残炭的分析，确定ZIF-8@SiO/EP的阻燃和抑烟机理是由于SiO的物理屏障作用以及SiO与ZIF-8分解产生的ZnO的协同作用。
