Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7214627 | Composites Science and Technology | 2018 | 35 Pages |
Abstract
Hybrid inorganic/polymer composite aerogels combine the advantages of both components which can overcome the brittle fracture of inorganic aerogels as well as high flammability of polymeric aerogels. Herein, we reported a facile approach to prepare polyvinyl alcohol (PVA)-hydroxyapatite (HAP) composite aerogel by freeze-casting process towards multi-functional aerogel materials. The incorporation of HAPs led to significant reduction in the peak heat release rate (â79%), total heat release (â76%), specific extinction area (â65%) and CO production (â45%). Vertical burning tests also manifested that PVA-HAP composite aerogels displayed excellent fire resistance and self-extinguishing behaviours. The resultant PVA-HAP composite aerogels also showed a low thermal conductivity (33.6-38.7â¯mWâ¯mâ1â¯Kâ1). The hydrogen bonding formed between the HAP and the PVA matrix endowed the resultant composite aerogels with a specific modulus (58.7â¯kNâ¯mâ1â¯kgâ1) which was comparable to or even higher than those reported by state-of-the-art foams, including polystyrene foams, polyurethane foams and silica aerogels. After a facile polydimethylsiloxane treatment, the resultant PVA-HAP composite aerogels also exhibited water-repellent and self-cleaning capacity, which is a promising candidate as building insulating materials.
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Authors
Wenwen Guo, Jiajia Liu, Ping Zhang, Lei Song, Xin Wang, Yuan Hu,