无机材料学报2025，Vol.40Issue(4)：415-424,10.DOI:10.15541/jim20240378
磷钼酸插层水滑石复合CNFs气凝胶的制备及其隔热保温性能
CNFs Aerogel Composite with Phosphomolybdic Acid Intercalated Hydrotalcite:Preparation and Thermal Insulation Performance
摘要
Abstract
Light-weight,heat-insulating and high-temperature resistant materials are essential for safety of astronauts and precision equipments.Nanocellulose(CNFs),with high specific surface area,low thermal expansion coefficient and high strength,has application prospects in preparation of light-weight and thermal insulation aviation materials.However,brittleness and high flammability of CNFs limit their widespread use in high-temperature fields.In order to improve the high temperature resistance of CNFs,[PMo12O40]3-intercalated ZnAl-PMo12O40-LDHs(PMo-LDHs,LDHs:layered double hydroxides)were successfully synthesized by co-precipitation and ion-exchange methods.Then the PMo-LDHs+BA/CNFs aerogel was prepared by combining ZnAl-PMo12O40-LDHs with boric acid(BA)to formulate CNFs composites.When the mass fractions of PMo-LDHs and BA are 62.5％and 2.0％of CNFs,density and thermal conductivity of 62.5PMo-LDHs+BA/CNFs aerogel are 16.28 kg·m-3 and 0.044 W/(m·K),respectively.Thermal insulation back-fire temperature experiments indicate that t250(time required to reach a thermal insulation temperature of 250℃)of 62.5PMo-LDHs+BA/CNFs aerogel is 2022.8 s,which is 867.8 s longer than that of pure CNFs aerogel.R250(heating rate when an insulation temperature reaches 250℃)is only 0.124℃·s-1,which is 57.4％of R250 for pure CNFs aerogel,demonstrating an exceptionally excellent thermal insulation effect.Combustion experiments reveal that the pure CNFs aerogel undergoes complete combustion within 15 s,whereas 62.5PMo-LDHs+BA/CNFs aerogel does not ignite within 81 s and exhibits no obvious shrinkage or deformation.Morphological observation of combustion residues indicates that a dense and uniform continuous carbon layer is formed on the surface of the aerogel due to the decomposition of PMo-LDHs,which significantly improves fire resistance of the CNFs aerogel.关键词
磷钼酸/插层水滑石/纳米纤维素/气凝胶/隔热保温Key words
phosphomolybdic acid/intercalated hydrotalcite/nanocellulose/aerogel/thermal insulation分类
化学工程引用本文复制引用
袁利萍,吴袁泊,俞佳静,张世琰,孙铱,胡云楚,范友华..磷钼酸插层水滑石复合CNFs气凝胶的制备及其隔热保温性能[J].无机材料学报,2025,40(4):415-424,10.基金项目
湖南省教育厅科学研究项目(23A0202) （23A0202）
长沙市自然科学基金项目(2022kq100) （2022kq100）
中央财政林业科技推广示范资金项目([2022]XT02)Scientific Research Project of Hunan Provincial Department of Education(23A0202) （[2022]XT02）
Changsha Natural Science Foundation Project(2022kq100) （2022kq100）
Central Finance Forestry Science and Technology Promotion Demonstration Fund Project([2022]XT02) （[2022]XT02）
