Urchinlike Shells of TiO2 Hollow Spheres for Improving the Fire Safety of Epoxy Resin

详细信息    查看全文

• 作者：Wei Wang ; Yongchun Kan ; Ying Pan ; Yao Yuan ; Kim Meow Liew ; Yuan Hu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：56
• 期：5
• 页码：1341-1348
• 全文大小：582K
• ISSN：1520-5045

文摘

Titanium dioxide (TiO₂) is widely studied because of its excellent properties, which make TiO₂ materials suitable for various applications. Here we introduce TiO₂ particles with different hierarchical structures which can improve the fire safety of epoxy resin (EP). Both amorphous hydrous TiO₂ solid spheres and urchinlike mesoporous TiO₂ hollow spheres (UMTHS) can enhance the thermal stability of EP composites. Moreover, cone test results demonstrate that EP/UMTHS with a 2 wt % loading has the lowest heat release rate, total heat release, smoke production rate, and total smoke production values among all the samples. The following plausible mechanism is proposed: urchinlike shells of UMTHS come into contact with each other during the stirring process and partly form a larger shell structure through a fusion process. The physical barrier formed by the fused shell can both shield the composites from external radiation and postpone the transfer of heat and flammable pyrolysis gases.