【摘要】 二氧化硅气凝胶的大规模应用受限于许多原因，机械性能差是其中之一。如何在应用中发挥气凝胶的优势一直是研究关注的重点。本研究将二氧化硅气凝胶微球添加到聚酰亚胺中成功制备了聚酰亚胺/二氧化硅气凝胶复合膜。实验结果显示：与纯聚酰亚胺膜相比，复合膜的热导率降低，并且随着添加量的增加而继续下降，最小值为0.321 W·m^-1·K^-1。与纯聚酰亚胺膜相比，复合膜的机械性能有所下降。因此，在膜材料应用中兼顾机械性能和隔热性能是很重要的。本研究丰富了气凝胶的应用形式。更多还原

【Abstract】 The large-scale application of silica aerogels is restricted due to many reasons, one of which is their poor mechanical properties. How to exert superiority of aerogels in application has always been the focus of research. In this work, the silica aerogel microspheres were added into polyimide to prepare composite films. The results show that the thermal conductivity of the composite film is declined compared with that of pure polyimide film and keeps decreasing with increasing additions, whose lowest value is 0.321 W·m^-1·K^-1. The mechanical strength is weakened compared with that of pure polyimide film. Therefore, the trade-off between thermal insulation performance and mechanical property is important in application of such film materials. The study enriches the application form of aerogels.更多还原