A synthetic route to organic aerogels: Mechanism, structure, and properties. [Resorcinol-formaldehyde]
The base catalyzed, aqueous reaction of resorcinol with formaldehyde follows a sol-gel pathway in which surface functionalized polymer clusters are formed. The covalent crosslinking of these clusters produces gels which are dried under supercritical conditions to obtain low density, organic aerogels which are dried under supercritical conditions to obtain low density, organic aerosols (less than or equal to200 mg/cc). The aerosols are transparent and have cell sizes less than 1000 /angstrom/. Their microstructure consists of interconnected colloidal-like particles with diameters of 30-100 /angstrom/. The particle size, cell size, surface area, and density of resorcinol-formaldehyde (RF) aerogels are largely determined by the catalyst concentration in the mixture. RF aerogels are similar to silica aerogels in many ways, yet a comparison of their mechanical properties suggests subtle morphological differences. 24 refs., 12 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6932678
- Report Number(s):
- UCRL-99554; CONF-8809131-1; ON: DE88017112
- Country of Publication:
- United States
- Language:
- English
Similar Records
Resorcinol-formaldehyde aerogels and their carbonized derivatives
Low density, resorcinol-formaldehyde aerogels
Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
360602 -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALDEHYDES
AROMATICS
CATALYSTS
CHEMICAL REACTIONS
COLLOIDS
CROSS-LINKING
CRYSTAL STRUCTURE
DEVELOPERS
DISPERSIONS
ELECTRON MICROSCOPY
FORMALDEHYDE
GELS
HYDROXY COMPOUNDS
KINETICS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
ORGANIC COMPOUNDS
PHENOLS
POLYMERIZATION
POLYPHENOLS
REACTION KINETICS
RESORCINOL
SOL-GEL PROCESS
SURFACE AREA
SURFACE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY