Issue 32, 2011

Multifunctional porous aramids (aerogels) by efficient reaction of carboxylic acids and isocyanates

Abstract

Polymerization of trifunctional polyaromatic carboxylic acids and isocyanates in dilute DMF solutions using the rather underutilized reaction of the carboxylic acid group (–COOH) with isocyanates (–N[double bond, length as m-dash]C[double bond, length as m-dash]O) towards amides (–NH(C[double bond, length as m-dash]O)–) induces early phase separation of surface-active aramid nanoparticles that form a solvent-filled 3D network stabilized against collapse by the chemical energy of the interparticle covalent bridges (crosslinks). Those wet-gels can be dried with liquid CO2 taken out at the end as a supercritical fluid into lightweight (bulk density ∼0.3 g cm−3) highly porous (77% v/v) multifunctional materials classified as aerogels with high specific energy absorption (37 J g−1), open-air speed of sound (338 m s−1) and Styrofoam-like thermal conductivity (0.028 W m−1 K−1).

Graphical abstract: Multifunctional porous aramids (aerogels) by efficient reaction of carboxylic acids and isocyanates

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2011
Accepted
25 May 2011
First published
30 Jun 2011

J. Mater. Chem., 2011,21, 11981-11986

Multifunctional porous aramids (aerogels) by efficient reaction of carboxylic acids and isocyanates

N. Leventis, C. Chidambareswarapattar, D. P. Mohite, Z. J. Larimore, H. Lu and C. Sotiriou-Leventis, J. Mater. Chem., 2011, 21, 11981 DOI: 10.1039/C1JM11472G

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