Aramid fibers reinforced silica aerogel composites with low thermal conductivity and improved mechanical performance |
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| Affiliation: | 1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Science and Technology of Advanced Functional Composite Materials Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China;1. Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600, Dübendorf, Switzerland;2. University of Fribourg, Department of Chemistry, Chemin du Musée 9, 1700, Fribourg, Switzerland;3. Concrete/Construction Chemistry Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600, Dübendorf, Switzerland;4. Center for X-ray Analytics, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600, Dübendorf, Switzerland;1. Institute of Solid Mechanics, Beihang University, Beijing 100191, China;2. National Key Laboratory of Advanced Functional Composite Material Technology, Beijing 100076, China;1. College of Engineering, Nanjing Agricultural University, Nanjing, 210031, China;2. Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996, USA;3. College of Chemical Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;4. Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China |
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| Abstract: | Aramid fibers reinforced silica aerogel composites (AF/aerogels) for thermal insulation were prepared successfully under ambient pressure drying. The microstructure showed that the aramid fibers were inlaid in the aerogel matrix, acting as the supporting skeletons, to strengthen the aerogel matrix. FTIR revealed AF/aerogels was physical combination between aramid fibers and aerogel matrix without chemical bonds. The as prepared AF/aerogels possessed extremely low thermal conductivity of 0.0227 ± 0.0007 W m?1 K?1 with the fiber content ranging from 1.5% to 6.6%. Due to the softness, low density and remarkable mechanical strength of aramid fibers and the layered structure of the fiber distribution, the AF/aerogels presented nice elasticity and flexibility. TG–DSC indicated the thermal stability reaching approximately 290 °C, can meet the general usage conditions, which was mainly depended on the pure silica aerogels. From mentioned above, AF/aerogels present huge application prospects in heat preservation field, especially in piping insulation. |
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| Keywords: | A Aramid fibers A Nanocomposites B Mechanical properties B Thermal properties |
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