The porosity control of organic resorcinol formaldehyde gel

Organic aerogels were synthesized by sol–gel polymerization of resorcinol (R) with formaldehyde (F) catalyzed by sodium carbonate (C) followed by ambient presure drying. The influence of the resorcinol/sodium carbonate ratio (R/C) on the porous structure of the resultant aerogels was investigated. The nitrogen adsorption–desorption measurements show that the aerogels possess a well developed porous structure and mesoporosity was found to increase with increasing the R/C ratio. Analysis of the resulting materials, utilizing pore size data derived from nitrogen adsorption/desorption isotherms, reveals that the R/C ratio plays a pivotal role in governing the surface morphology, surface area, and overall pore volume of RF gels. Notably, an escalation in the R/C ratio correlates with enhanced mesoporosity in aerogels. By increase in R/C mol ratio the spesific surface area of thea samples decreses from ۳۸۰ to ۱۵۰ m۲ g-۱

Keywords:

RF aerogel , Porosity control , Alkaline catalyst , Organic gel.