文献类型：期刊文献

英文题名：Lightweight Nitrogen-Doped Phenolic Aerogels with Flame-Retardant and Thermal-Insulation Properties

作者：Cao, Junxiang[1];Wang, Peng[1];Cai, Hongxiang[1];Niu, Bo[1];Zhang, Yayun[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China

年份：2023

卷号：5

期号：12

起止页码：10276

外文期刊名：ACS APPLIED POLYMER MATERIALS

收录：;EI(收录号：20234915186532);WOS:【SCI-EXPANDED(收录号:WOS:001121875100001)】；

基金：This work is supported by the National Natural Science Foundation of China (Nos. 22078100, 52102098, and 22008073) and the China Postdoctoral Science Foundation (2022M711140).

语种：英文

外文关键词：phenolic; flame retardancy; melamine; aerogel; thermal insulation

摘要：The inherent flammability of phenolic aerogels has imposed significant limitations on its utilization. In order to unlock the potential of phenolic aerogels as insulation and flame-retardant materials, we fabricate a series of melamine-phenolic aerogels (MPAs) based on a copolymerization reaction of melamine and phenolics in a sol-gel process. By varying the quantity of melamine, the microstructures and the corresponding thermal properties of MPAs are investigated. The results indicate that MPAs possess ultralow thermal conductivity of 0.036-0.038 W/(mK) and a density of 0.34-0.40 g/cm(3). In addition, melamine greatly increases the flame retardancy of phenolic aerogels. A modified phenolic aerogel containing 40 wt % melamine has a limiting oxygen index (LOI) value of 32.7%. The measured maximum heat release rate values of MPAs decrease with the increase of melamine portions in samples, ranging from 138 to 74 kW/m(2) in the cone calorimeter testing experiment. Furthermore, TG-MS-FTIR technology is used to analyze the gas emission during thermal decomposition, and the structure evolution of the solid phase is studied for a better understanding of the flame-retardant mechanism. This research is intended to present phenolic-based aerogel materials with outstanding overall performance and explore their potential for large-scale production in the future.