文献类型：期刊文献

英文题名：Enhancing the thermal insulation properties of polymer-derived SiCN(O) ceramic aerogels with a polysilazane-precursor design

作者：Wang, Wei[1];Pang, Le[2];Jiang, Ming[2];Zhu, Yaping[1];Wang, Fan[1];Sun, Jingwen[2];Qi, Huimin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Inst Space Equipment, Lab Aerosp Thermal Control Prod Adv Mfg Technol, Shanghai 201109, Peoples R China

年份：2023

卷号：49

期号：10

起止页码：15829

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20230613539691);WOS:【SCI-EXPANDED(收录号:WOS:000969927000001)】；

基金：This work is supported by Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, East China University of Science & Technology, the Fundamental Research Funds for the Central Universities (Grant No. 50321041918013, and 50321041917001) , and the Innovation Foundation of Shanghai Aerospace Science and Technology, China (No. SAST2019-068) .

语种：英文

外文关键词：Polysilazane; Precursor structure; Ceramic aerogel; Thermal conductivity

摘要：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 degrees C, ranging from 3.7 to 255.9 m(2)/g and 0.01-0.36 cm(3)/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.