Tough Polymer Aerogels Incorporating a Conformal Inorganic Coating for Low Flammability and Durable Hydrophobicity

Both inorganic and polymeric aerogels are well-known in the materials field. Inorganic aerogels are generally susceptible to brittle fracture, while polymeric aerogels tend to exhibit low modului and high flammability. To overcome these disadvantages, we introduce a new approach to the design of aer...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2016-05, Vol.8 (20), p.13051-13057
Main Authors: Sun, Hua, Schiraldi, David A, Chen, Dayong, Wang, Danqi, Sánchez-Soto, Miguel
Format: Article
Language:English
Subjects:
Aerogel
Aerogels
Assaig de materials
Assaigs de comportament davant el foc
Coating
Enginyeria dels materials
Fire resistance
Fire testing
Hydrophobicity
Materials plàstics i polímers
Nanocomposite
Nanocomposites (Materials)
Nanocompostos (Materials)
Àrees temàtiques de la UPC
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Summary:Both inorganic and polymeric aerogels are well-known in the materials field. Inorganic aerogels are generally susceptible to brittle fracture, while polymeric aerogels tend to exhibit low modului and high flammability. To overcome these disadvantages, we introduce a new approach to the design of aerogels. A microporous poly­(vinyl alcohol) (PVA) aerogel/silica nanocomposite was prepared by growing a silica conformal coating onto a PVA aerogel scaffold. Such aerogel/silica nanocomposites show significant improvement in their mechanical properties over either individual component. The nanocomposites show excellent fire resistance since the silica conformal coating serves as a barrier for heat transfer and mass loss of the coated organic materials. After a fluorocarbon silane treatment, the nanocomposites also show durable superhydrophobicity.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.6b02829