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Structure and Properties of Resorcinol-Formaldehyde Gels

Published online by Cambridge University Press:  21 February 2011

Stephan A. Letts ,
Steven R. Buckley ,
Fung-Ming Kong ,
Edward F. Lindsay  and
Margaret L Sattler
Stephan A. Letts
Affiliation:
University of California, Lawrence Livermore National Laboratory, P. O. Box 5508 (L-482), Livermore, California 94550
Steven R. Buckley
Affiliation:
University of California, Lawrence Livermore National Laboratory, P. O. Box 5508 (L-482), Livermore, California 94550
Fung-Ming Kong
Affiliation:
University of California, Lawrence Livermore National Laboratory, P. O. Box 5508 (L-482), Livermore, California 94550
Edward F. Lindsay
Affiliation:
University of California, Lawrence Livermore National Laboratory, P. O. Box 5508 (L-482), Livermore, California 94550
Margaret L Sattler
Affiliation:
University of California, Lawrence Livermore National Laboratory, P. O. Box 5508 (L-482), Livermore, California 94550
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 275
Copyright
Copyright © Materials Research Society 1990

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References

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