期刊
ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 3, 页码 613-626出版社
AMER CHEMICAL SOC
DOI: 10.1021/am200007n
关键词
silica aerogel; polymer cross-linking; nanoporous materials; flexible aerogels; sol-gel; conformal coatings; skeletal density
资金
- Fundamental Aeronautics Program (Subsonics Rotary Wing and Hypersonics)
- NASA
Silica aerogels are highly porous solid materials consisting of three-dimensional networks of silica particles and are typically obtained by removing the liquid in silica gels under supercritical conditions. Several unique attributes such as;extremely low thermal conductivity and low density make silica aerogels excellent candidates in the quest for thermal insulation materials used in space missions. However, native silica aerogels are fragile at relatively low stresses. M:ore durable aerogels with higher strength and stiffness are obtained by proper selection of silane precursors and by reinforcement with polymers. This paper first presents a brief review of the literature on methods of silica aerogel reinforcement and then discusses our recent activities in improving not only the strength but also the elastic response of polymer-reinforced silica aerogels. Several alkyl-linked bis-silanes were used in promoting flexibility of the silica networks in conjunction with polymer reinforcement by epoxy.
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