Enhancing the thermal insulation properties of polymer-derived SiCN(O) ceramic aerogels with a polysilazane-precursor design |
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| Affiliation: | 1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China;2. Laboratory of Aerospace Thermal Control Products Advanced Manufacturing Technology, Shanghai Institute of Space Equipment, Shanghai, 201109, China;1. Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia;2. Nanotechnology Research Unit, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia;3. NCIM-Resource Center, Biochemical Science Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune, 411008, India;4. Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia;5. Department of Physics, Faculty of Science, Alexandria University, Egypt;6. Department of Biology, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia;7. R&D Biotechnology, Sami-Sabinsa Group, Bangalore, 560058, India;1. College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining, 810000, China;2. Academy of Plateau Science and Sustainability, Qinghai Normal University, Xining, 810016, PR China;3. College of Mechanical Engineering, Qinghai University, Xining, 810016, China;4. Guandu School of Kunming No.1 Middle School, Kunming, 650206, China;1. Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, CS 60584, Toulon, Cedex 9, F-83041, France;2. Université de Toulon, Aix Marseille Université, CNRS/INSU, IRD, MIO UM 110, CS 60584-83041, Toulon, CEDEX 9, France |
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| Abstract: | In this study, we investigated the tunable porous structure of SiCN(O)-derived ceramic aerogels by changing the molecular structure of the polysilazanes from linear to branched. We also studied the effect of molecular structure on the thermal insulation properties of ceramic aerogels. As the percentage of branched molecular structure in the polysilazane precursor increased, the internal microscopic pore structure of the aerogels changed from macroporous to mesoporous. The specific surface areas and pore volumes of the ceramic aerogels prepared with different precursors increased after pyrolysis at 1000 °C, ranging from 3.7 to 255.9 m2/g and 0.01–0.36 cm3/g, respectively. The corresponding thermal conductivities increased slightly as the aerogels contracted after pyrolysis. The low thermal conductivity (0.046 W/(m·K) at minimum) can be attributed to the decrease in pore size caused by adjusting the precursor structure, which limits the thermal conduction of gas in the porous aerogel materials. |
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| Keywords: | Polysilazane Precursor structure Ceramic aerogel Thermal conductivity |
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