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Clay reinforced polyimide/silica hybrid aerogel

Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 1, Issue: 24, Page: 7211-7221
2013
  • 70
    Citations
  • 0
    Usage
  • 44
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    70
    • Citation Indexes
      69
    • Patent Family Citations
      1
      • Patent Families
        1
  • Captures
    44

Article Description

Silica aerogels are comprised of highly porous three-dimensional networks. They typically are very fragile and brittle due to the inter-particle connections in the pearl-necklace-like fractal network. This behavior prevents their wider utility. The present study aims to reinforce the silica-based gel to improve the poor mechanical strength through crosslinking the silica particles with polyimide and incorporating Lucentite STN clay into the skeletal silica-polyimide network. 3-Aminopropyltriethoxysilane (APTES) end-capped polyamic acid oligomers were first formed followed by gelation with TMOS at a range of clay concentrations to generate a silica network. The incorporation of clay leads to slightly lower BET surface area with little effect on shrinkage, porosity and density. Microscopy revealed that the aerogel preferentially grows from the edges of well dispersed clay particles while minimal growth occurs from clay surfaces. The formation of covalent bonds and hydrogen bonding through the OH functionalized clay edges is thought to enhance the connectivity with silica network and clay, leading to a substantial reinforcement effect as evidenced by an increase in modulus. © The Royal Society of Chemistry 2013.

Bibliographic Details

Jiao Guo; Lichun Li; Miko Cakmak; Baochau N. Nguyen; Daniel A. Scheiman; Mary Ann B. Meador

Royal Society of Chemistry (RSC)

Chemistry; Energy; Materials Science

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