V. Bock et al., INFLUENCE OF MONOMER AND CATALYST CONCENTRATION ON RF AND CARBON AEROGEL STRUCTURE, Journal of non-crystalline solids, 225(1), 1998, pp. 69-73
Structure and density of organic RF (resorcinol formaldehyde) aerogels
and pyrolized RF aerogels (carbon aerogels) can be modified upon vari
ation of the resorcinol to catalyst (RC) ratio and by varying the mass
ratio of the reactants resorcinol and formaldehyde in the sol. Here,
series of RF and carbon aerogels have been produced with RC 200, 500 a
nd 1500, each covering a wide density range. All samples were investig
ated using small angle X-ray scattering (SAXS), N-2 and CO2 adsorption
. The creation of a huge amount of microporosity due to pyrolysis was
observed and investigated by CO2 adsorption. SAXS scattering curves ex
hibit interesting structural changes. These investigation were accompa
nied by sound velocity measurements to obtain the elastic modulus. (C)
1998 Elsevier Science B.V. All rights reserved.