TY - JOUR
T1 - Scalable, hydrophobic and highly-stretchable poly(isocyanurate-urethane) aerogels
AU - Malakooti, Sadeq
AU - Rostami, Saman
AU - Churu, Habel Gitogo
AU - Luo, Huiyang
AU - Clark, Jenna
AU - Casarez, Fabiola
AU - Rettenmaier, Owen
AU - Daryadel, Soheil
AU - Minary-Jolandan, Majid
AU - Sotiriou-Leventis, Chariklia
AU - Leventis, Nicholas
AU - Lu, Hongbing
N1 - Funding Information:
We thank Mr J. Salazar for the assistance with the DMA experiments, and Mrs N. Mohammadi for the static contact angle measurements. Also, S. M. thanks Mr R. Swamy and Mr T. Haines for their help on the material preparations. In addition, the support by NSF CMMI-1636306, CMMI-1661246, and CMMI-1726435, and Nashi-Tech New Materials, Inc. China is acknowledged. N. L. and C. S.-L. thank the Army Research Office under W911NF-14-1-0369. H. L. also thanks the Luis A. Beecherl Jr. Chair for additional support and Covestro LLC (formerly Bayer Corporation U.S.A.) for the supply of Desmodur N3300A.
Publisher Copyright:
© The Royal Society of Chemistry 2018.
PY - 2018
Y1 - 2018
N2 - Scalable, low-density and flexible aerogels offer a unique combination of excellent mechanical properties and scalable manufacturability. Herein, we report the fabrication of a family of low-density, ambient-dried and hydrophobic poly(isocyanurate-urethane) aerogels derived from a triisocyanate precursor. The bulk densities ranged from 0.28 to 0.37 g cm-3 with porosities above 70% v/v. The aerogels exhibit a highly stretchable behavior with a rapid increase in the Young's modulus with bulk density (slope of log-log plot > 6.0). In addition, the aerogels are very compressible (more than 80% compressive strain) with high shape recovery rate (more than 80% recovery in 30 s). Under tension even at high strains (e.g., more than 100% tensile strain), the aerogels at lower densities do not display a significant lateral contraction and have a Poisson's ratio of only 0.22. Under dynamic conditions, the properties (e.g., complex moduli and dynamic stress-strain curves) are highly frequency- and rate-dependent, particularly in the Hopkinson pressure bar experiment where in comparison with quasi-static compression results, the properties such as mechanical strength were three orders of magnitude stiffer. The attained outcome of this work supports a basis on the understanding of the fundamental mechanical behavior of a scalable organic aerogel with potential in engineering applications including damping, energy absorption, and substrates for flexible devices.
AB - Scalable, low-density and flexible aerogels offer a unique combination of excellent mechanical properties and scalable manufacturability. Herein, we report the fabrication of a family of low-density, ambient-dried and hydrophobic poly(isocyanurate-urethane) aerogels derived from a triisocyanate precursor. The bulk densities ranged from 0.28 to 0.37 g cm-3 with porosities above 70% v/v. The aerogels exhibit a highly stretchable behavior with a rapid increase in the Young's modulus with bulk density (slope of log-log plot > 6.0). In addition, the aerogels are very compressible (more than 80% compressive strain) with high shape recovery rate (more than 80% recovery in 30 s). Under tension even at high strains (e.g., more than 100% tensile strain), the aerogels at lower densities do not display a significant lateral contraction and have a Poisson's ratio of only 0.22. Under dynamic conditions, the properties (e.g., complex moduli and dynamic stress-strain curves) are highly frequency- and rate-dependent, particularly in the Hopkinson pressure bar experiment where in comparison with quasi-static compression results, the properties such as mechanical strength were three orders of magnitude stiffer. The attained outcome of this work supports a basis on the understanding of the fundamental mechanical behavior of a scalable organic aerogel with potential in engineering applications including damping, energy absorption, and substrates for flexible devices.
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U2 - 10.1039/c8ra03085e
DO - 10.1039/c8ra03085e
M3 - Article
AN - SCOPUS:85048812883
VL - 8
SP - 21214
EP - 21223
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 38
ER -