Low density, resorcinol-formaldehyde aerogels

Patent · Tue Mar 05 00:00:00 EST 1991

OSTI ID:5052241

Pekala, R

This patent describes the polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer Clusters. The covalent crosslinking of these clusters produces gels which when processed under supercritical conditions, produce low density, organic aerogels (density {le} 100 mg/cc; cell size {le} 0.1 microns). The aerogels are transparent, dark red in color and consist of interconnected colloidal-like particles with diameters of about 100. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron.

• Assignee: Dept. of Energy, Washington, DC (USA)
• Patent Number(s): US 4997804; A
• Application Number: PPN: US 7-406009
• OSTI ID: 5052241
• Resource Relation: Patent File Date: 12 Sep 1989
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FORMALDEHYDE
GELS
RESORCINOL
CARBONIZATION
CHEMICAL PREPARATION
CROSS-LINKING
DENSITY
FOAMS
PARTICLE SIZE
POLYMERS
SUPERCRITICAL STATE
ALDEHYDES
AROMATICS
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DEVELOPERS
DISPERSIONS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
PHENOLS
PHYSICAL PROPERTIES
POLYMERIZATION
POLYPHENOLS
SIZE
SYNTHESIS
360601* - Other Materials- Preparation & Manufacture
360603 - Materials- Properties
400201 - Chemical & Physicochemical Properties