sup 13 C NMR investigation of crosslinking in organic aerogels

Conference · Fri Sep 15 04:00:00 EDT 1989

OSTI ID:7258101

Ward, R. L.; Pekala, R. W.

Organic aerogels are a special type of low density foam produced from the supercritical drying of resorcinol-formaldehyde (RF) gels. These aerogels have continuous porosity, ultrafine cell/pore sizes (<1000 {angstrom}), and a microstructure composed of interconnected colloidal-like particles with diameters ranging from 30-175 {angstrom}. The particle size, surface area, density, and mechanical properties of the aerogels are largely determined by the catalysts concentration used in the sol-gel polymerization. In order to gain some insight into the crosslinks between RF particles, aerogels were labeled with C-13 formaldehyde at various times in the polymerization. CPMAS and IRCP techniques were used to correlate the relaxation behavior of the C-13 enriched aerogels with their different microstructures. 9 refs., 1 fig., 2 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7258101
• Report Number(s): UCRL-101922; CONF-900480--1; ON: DE90002972
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation &amp; Manufacture
360602 -- Other Materials-- Structure &amp; Phase Studies
ALDEHYDES
AROMATICS
CHEMICAL REACTIONS
COLLOIDS
CROSS-LINKING
CRYSTAL STRUCTURE
DEVELOPERS
DISPERSIONS
FORMALDEHYDE
GELS
HYDROXY COMPOUNDS
MICROSTRUCTURE
NMR SPECTRA
ORGANIC COMPOUNDS
PARTICLE SIZE
PHENOLS
POLYMERIZATION
POLYPHENOLS
POROSITY
RESORCINOL
SIZE
SPECTRA