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The use of γ -alumina-polymerized furfuryl alcohol resin binders in the fabrication of graphite

✍ Scribed by E.M. Wewerka; J.M. Dickinson

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
696 KB
Volume
11
Category
Article
ISSN
0008-6223

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✦ Synopsis

Two

kinds of y-alumina-polymerized furfuryl alcohol resins were synthesized and examined as graphite binder materials.

Prior to their use, the resins were characterized according to viscosity and molecular size distribution. Investigation by gas chromatography showed that, relative to acid-polymerized resins, the y-alumina-polymerized furfuryl alcohol resins contain large amounts of products that will not polymerize further. Extruded graphite rods were manufactured from both the y-alumina-polymerized resins and from comparable acid-polymerized resins. The graphites fabricated with the y-alumina-polymerized resins are shown to have generally poorer physical properties than those made with acid-polymerized resins of similar viscosities. Evidence is presented to show that not only must molecular size distribution be considered when evaluating the suitability of furfuryl alcohol resins as graphite binder materials, but also of importance is the canabilitv of the low-molecular-weight resin components to further polymerize during heat-treatment.

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The viscosities and molecular size distributions of furfuryl alcohol resin binders are shown to have important influences on the fabrication and physical properties of graphites made from them. Increasing binder viscosity to about 2000 cp improves the physical properties of the graphite. Above this,