文献类型：期刊文献

英文题名：Ultrahigh-strength silicone aerogels reinforced by an armor-like epoxy framework via a temperature-controlled sequential reaction strategy

作者：Yan, Aoqing[1];Luo, Yi[1];Tian, Hao[1];Pan, Helin[1];Cao, Yu[1];Niu, Bo[1];Zhang, Yayun[1,2];Long, Donghui[1,2]

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

年份：2024

卷号：663

起止页码：665

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20241015666660);WOS:【SCI-EXPANDED(收录号:WOS:001202642200001)】；

基金：This work was supported by National Natural Science Foundation of China (No. 22078100, No. 52102098, and No. 22008073) and Funda- mental Research Funds for the Central Universities (No. 222201718002) .

语种：英文

外文关键词：Silicone aerogels; Armor -like framework; Ultra -high strength; Temperature -controlled sequential reaction

摘要：Aerogels with low density and high porosity are extremely attractive for high-performance insulation, but their brittleness, complicated fabrication, and poor mechanical properties greatly limit their practical applications. Herein, we report an ultrahigh -strength silicone aerogel with an armor -like epoxy framework via a temperaturecontrolled sequential reaction strategy. The key to this synthesis is forming a Si -O -Si framework via the polycondensation of silanes at 100 degrees C, followed by in -situ armoring an epoxy framework via an intermolecular cyclization at an elevated temperature of 150 degrees C. Owing to the enhanced framework, the resulting aerogel could withstand capillary tension in the drying process, enabling it to be dried at ambient pressure without shrinkage. The obtained aerogel possesses a tunable density of 0.17-0.45 g/cm3 and ultrahigh -strength with compressive modulus up to 37.8-244.3 MPa, which surpasses other polymer -reinforced silicone aerogels by a factor of five in mechanical properties. It also demonstrates outstanding thermal insulation, with an extremely low thermal conductivity from 0.025 to 0.051 W m-1 K-1 at room temperature, and maintains thermal characteristics across a temperature range of -20 to 300 degrees C. Furthermore, the aerogel composites prepared by the reinforcement of low -density fiber mats have tunable densities of 0.36-0.87 g/cm3, much enhanced tensile strengths of 15.9-72.3 MPa, and low thermal conductivities at room temperature of 0.042-0.078 W m-1 K-1. This study presents a costeffective method for enhancing the production of silicone aerogel materials, offering considerable opportunities for their application in insulation, energy transport, and the aerospace sector.