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
- Resource Relation:
- Conference: 2. international symposium on aerogels, Montpellier, France, 21 Sep 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Low density, resorcinol-formaldehyde aerogels
Low density, resorcinol-formaldehyde aerogels
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FORMALDEHYDE
MECHANICAL PROPERTIES
GELS
RESORCINOL
CATALYSTS
CROSS-LINKING
MICROSTRUCTURE
POLYMERIZATION
REACTION KINETICS
SOL-GEL PROCESS
SURFACE AREA
TRANSMISSION ELECTRON MICROSCOPY
ALDEHYDES
AROMATICS
CHEMICAL REACTIONS
COLLOIDS
CRYSTAL STRUCTURE
DEVELOPERS
DISPERSIONS
ELECTRON MICROSCOPY
HYDROXY COMPOUNDS
KINETICS
MICROSCOPY
ORGANIC COMPOUNDS
PHENOLS
POLYPHENOLS
SURFACE PROPERTIES
360601* - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies
360603 - Materials- Properties
400201 - Chemical & Physicochemical Properties