以SiO2气凝胶和聚四氟乙烯(PTFE)为添加物,以玻璃纤维为增强相,探究不同玻璃纤维加入量对SiO2气凝胶/PTFE复合隔热板性能的影响,利用FT-IR、BET、综合热分析等检测方法对复合材料的结构和性能进行表征。实验结果表明,玻璃纤维添加量为0.5%(wt,质量分数)时,复合材料的热导率最低,灰分较少。此外,材料的密度随着玻璃纤维添加量的增大呈线性增加;随着玻璃纤维添加量的增加,复合材料的耐高温性能越来越强,热导率变化越来越小。
Taking silica aerogels and polytetrafluoroethylene as additives and glass fiber as reinforcement,the effects of different glass fiber content on the properties of silica aerogels/PTFE composite insulation panels were investigated.The structure and properties of the composites were characterized by FT-IR,BET and comprehensive thermal analysis.The results shown that when the glass fiber content was 1.5wt%,the overall performance of the composites was the best,and the pore diameter was 116.90nm.In addition,the density of the composites increased linearly with the increase of the amount of glass fiber.With the increase of the amount of glass fiber,the high temperature resistance of the composites became stronger and the thermal conductivity changed less and less.
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