Hostname: page-component-745bb68f8f-l4dxg Total loading time: 0 Render date: 2025-01-27T23:27:23.287Z Has data issue: false hasContentIssue false
  • English
  • Français

Novel superflexible resorcinol–formaldehyde aerogels and combining of them with aramid honeycombs

Published online by Cambridge University Press:  11 November 2014

Marina Schwan ,
Barbara Milow  and
Lorenz Ratke
Marina Schwan*
Affiliation:
Institute of Materials Research, German Aerospace Center, DLR, 51170 Cologne, Germany
Barbara Milow
Affiliation:
Institute of Materials Research, German Aerospace Center, DLR, 51170 Cologne, Germany
Lorenz Ratke
Affiliation:
Institute of Materials Research, German Aerospace Center, DLR, 51170 Cologne, Germany
*
Address all correspondence to Marina Schwan at Marina.Schwan@dlr.de
Get access

Abstract

We report a new insulation composite of aramid honeycombs filled with superflexible resorcinol–formaldehyde aerogels. Aerogels produced via a sol–gel process were dried with supercritical CO2. The aerogels exhibit a high, rubber-like flexibility, due to almost zero shrinkage and networking of nanoparticles and suitably sized macropores. The high porosity of the aerogels in the range of about 95–98% leads to a low thermal conductivity about 0.037 W/mK and low bulk density of 0.05 g/cm3. The filling of light and stiff aramid honeycombs with these flexible aerogels results in a composite with decreased thermal conductivity and modified mechanical properties.

Type
Research Letters
Information
MRS Communications , Volume 4 , Issue 4 , December 2014 , pp. 177 - 181
Copyright
Copyright © Materials Research Society 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Kistler, S.S.: Coherent expanded aerogels. J. Phys. Chem. 36, 52–46 (1932).CrossRefGoogle Scholar
2.Pekala, R.: Organic aerogels from the polycondensation of resorcinol with formaldehyde. J. Mater. Sci. 24, 3221–3227 (1989).Google Scholar
3.Mulik, S. and Sotiriou-Leventis, Ch.: Resorcinol – formaldehyde aerogels, in Aerogels Handbook, edited by Aegerter, M.A., Leventis, N. and Koebel, M.M. (Springer, New York, 2011), p. 215.Google Scholar
4.Jin, C.: Aerogels super-thermal insulation materials by Nano Hi-tech, in Aerogels Handbook, edited by Aegerter, M.A., Leventis, N. and Koebel, M.M. (Springer, New York, 2011), p. 865.Google Scholar
5.Mendenhall, R.: American Aerogel Corporation: organic aerogel commercialization, in Aerogels Handbook, edited by Aegerter, M.A., Leventis, N. and Koebel, M.M. (Springer, New York, 2011), p. 857.Google Scholar
6.Ratke, L. and Milow, B.: Aerogels for foundary applications, in Aerogels Handbook, edited by Aegerter, M.A., Leventis, N. and Koebel, M.M. (Springer, New York, 2011), p. 763.Google Scholar
7.Shen, J. and Guan, D.Y.: Preparation and application of carbon aerogels, In Aerogels Handbook, edited by Aegerter, M.A., Leventis, N. and Koebel, M.M. (Springer, New York, 2011), p. 813.Google Scholar
8.Kanamori, K., Aizawa, M., Nakanishi, K. and Hanada, T.: New transparent methylsilsesquioxane aerogels and xerogels with improved mechanical properties. Adv. Mater. 19, 1589–1593 (2007).Google Scholar
9.Schwan, M. and Ratke, L.: Flexibilisation of resorcinol formaldehyde aerogels. J. Mater. Chem. A 1, 13462–13468 (2013).CrossRefGoogle Scholar
10.Bitzer, T.: Honeycomb Technology (Chapman & Hall, London, 1997), p. 2.CrossRefGoogle Scholar
11.Gibson, L.J. and Ashby, M.F.. Cellular Solids: Structure and Properties (Cambridge University Press, Cambridge, 1997), p. 175.Google Scholar
12.Abd El-Sayed, F.K., Jones, R. and Burgess, I.W.: A theoretical approach to the deformation of honeycomb based composite materials. Composites 145, 341–360 (1997).Google Scholar
13.Beblo, R.V., Puttmann, J.P., DeLeon, N.E., Joo, J.J. and Reich, G.W.: SMP filled honeycombs as a reconfigurable skin: model and experimental validation, in Proc. of the 19th Int. Conf. on Composite Materials, Montreal, July–August, 2013, pp. 1, 9.Google Scholar
14.Jhaver, R. and Tippur, H.: Characterization and modeling of compression behavior of syntactic foam filled honeycombs. J. Reinf. Plast. Comp. 29, 3185–3196 (2010).CrossRefGoogle Scholar
15.Murray, G., Gandhi, F. and Hayden, E.: Polymer filled honeycombs to achieve a structural material with appreciable damping. J. Intell. Mater. Syst. Struct. 23, 703–718 (2012).Google Scholar
16.Resewski, C. and Buchgraber, W.: Properties of new polyimide foams and polyimide filled honeycomb composites. Mater. Wiss. Werkstofftech. 34, 365–369 (2003).CrossRefGoogle Scholar
17.Joshi, S.C.: Low velocity impact performance of aerogel filled sandwich composites, in Proc. of the 16th Int. Conf. on Composite Structures, Porto, June, 2011.Google Scholar
18.http://www.aerogel.com/ (accessed April 25, 2014).CrossRefGoogle Scholar
19.http://glassmagazine.com/article/commercial/most-innovative-energy-e_cient-glass-product-106654 (accessed April 25, 2014).Google Scholar
20.Knop, A. and Pilato, L.A.: Phenolic Resins (Springer-Verlag, Berlin, Heidelberg, New York, Tokyo, 1985), p. 175.Google Scholar
21.HexWebTM honeycomb attributes and properties. Hexcel, 1999.Google Scholar
22.Kevlar Aramid Fiber, Technical Guide, Table II-1, DuPont Advanced Fiber Systems, Richmond, VA, USA.Google Scholar