文献类型：期刊文献

英文题名：High-energy B-O bonds enable the phenolic aerogel with enhanced thermal stability and low thermal conductivity

作者：Gao, Wei[1,2,3,4];Wang, Zhenyu[1,2,3,4];Zhang, Yongzheng[1];Shen, Chunyin[1,2,3,4];Wang, Yanli[1];Zhan, Liang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Green Chem Engn & Ind Catalysis, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：669

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20242416253888);WOS:【SCI-EXPANDED(收录号:WOS:001253740500001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (No.22075081, 52372045 and U1710252) , the Fundamental Research Funds for the Central Universities (JKD01231701) , China Postdoctoral Science Foundation (No. 2023M731084) .

语种：英文

外文关键词：Phenolic aerogel; Thermal stability; Phenyl-borates structure; B-O bonds

摘要：Phenolic aerogels have addressed considerate application in fabricating lightweight ablative materials owing to their excellent characteristics of large surface area, low bulk density, and low thermal conductivity. However, unsatisfactory thermal stability still limits their extensive applications. To enhance the thermal stability, we reported a facile co-precursor strategy to prepare boron-modified phenolic aerogels, through sol-gel polymerization of phenylboronic acid and phenolic resin. The thermal stability of hybrid aerogels is remarkably enhanced, achieving a char yield of up to 64.16 % at 850 degree celsius due to the much higher bonding energy of B-O bonds. The phenyl-borates structure gradually transferred into B2O3, effectively fixing the oxygen content and reducing the carbon loss during the carbonization process. Moreover, the in-situ formed phenyl-borates structure contributes to forming a denser network, which affords the hybrid aerogels with diverse properties: low density (0.31-0.34 g/cm3), a hierarchical micro-meso-macro porous structure with small particle size (28.42-48.58 nm), promoted compressive strength (20.65-28.46 MPa), and excellent insulation performance (0.0406-0.0564 W/(m center dot k)). These integrated superiorities enable the boron-modified phenolic aerogels to perform effectively in thermal insulation fields, especially for aerospace related industry.