Structure and properties of resorcinol-formaldehyde gels

Conference · Tue Nov 21 23:00:00 EST 1989

DOI:https://doi.org/10.1557/PROC-177-275· OSTI ID:5300608

Letts, S A; Buckley, S R; Kong, Fung-Ming; Lindsey, E F; Sattler, M L

The condensation polymerization of resorcinol and formaldehyde catalized by sodium carbonate produces a sol that aggregates to form a gel. Using viscometry the effect of temperature and catalyst concentration on the sol-gel transition was investigated. At a solids concentration of 3%, gelation occurred in 1500 minutes. The rate of increase in viscosity was a function of both catalyst concentration and temperature. The structure of the gels was studied by freeze-fracture TEM. In the sol phase the RF solutions contain particles of 5 to 20 nm diameter. After gelation the particles form a crosslinked network with a pore structure of 100 nm. 10 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5300608
• Report Number(s): UCRL-101307; CONF-891119--61; ON: DE90005201
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360602* -- Other Materials-- Structure & Phase Studies
ALDEHYDES
ALKALI METAL COMPOUNDS
AROMATICS
CARBON COMPOUNDS
CARBONATES
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COLLOIDS
DENSITY
DEVELOPERS
DISPERSIONS
FOAMS
FORMALDEHYDE
GELS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
PHENOLS
PHYSICAL PROPERTIES
POLYMERIZATION
POLYPHENOLS
RESORCINOL
SIZE
SODIUM CARBONATES
SODIUM COMPOUNDS
TEMPERATURE EFFECTS
VISCOSITY