期刊
COMPOSITES PART B-ENGINEERING
卷 223, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109081
关键词
Polymer-matrix composites (PMCs); Mechanical properties; Thermal properties; Aerogel
资金
- National Natural Science Foundation of China [21476267]
- Hunan Natural Science Foundation [2018JJ2482]
A novel HAnws/PI composite aerogel with high porosity and low density was successfully synthesized in this study. The aerogel showed obvious anisotropic mechanical properties, with high fatigue resistance. Additionally, the aerogel exhibited good thermal insulation performance, making it suitable for insulation pipes.
Advanced composite aerogel materials have attracted much attention due to the unique structure and properties. However, the efficient manufacturing process and structural stability were still a challenge. Herein, a novel hydroxyapatite nanowires/polyimide (HAnws/PI) composite aerogel was synthesized by the ultralong HAnws combined with polyamic acid via directional freezing and thermal imidization. Among them, the HAnws and PI intertwined to form a three-dimensional network structure, which decreased the volume shrinkage of aerogel in thermal imidization from 42.9% to 12.6%, resulting in high porosity (>96%) and low density (0.0329-0.0431 g cm(-3)). In addition, the HAnws/PI aerogel with layered porous structure exhibits obvious anisotropic mechanical properties. The axial specific modulus as high as 78.05 kN m kg(-1) and radial high elasticity can withstand 100 cycles of fatigue resistance. Moreover, the lowest radial thermal conductivity at 32.21 mW m(-1) K-1 and the maximum of the anisotropy factor was 2.2, which was very suitable for insulation pipes to prevent additional heat loss. Therefore, the novel nanofibers reinforced organic aerogel was expected to provide more abundant functional applications in energy efficiency.
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