Abstract
The pyrolysis of polyfurfuryl alcohol and phenolic polymers leading to glasslike carbon is studied in detail. The effect of crosslinking of the polymers is shown by the modification of polyfurfuryl alcohol with formaldehyde as well as by comparison with oxidized polyphenylene oxide. Analogous shrinkage behavior independent of the starting materials leads to a comparable porosity of the glasslike carbons of about 30 percent. The pores are of uniform size, having a diameter of 25 Å after heat treatment to 2200°C and of 35 Å after heat treatment to 3000°C. Most of the pore entrances lie between 4 and 5 Å. The strength characteristics of glasslike carbon in dependence upon the heat treatment temperature exhibit maximum values after heat treatment to 2000°C, the resulting room temperature values being 15,000 psi for the flexural strength and 4.5−5 × 10 6 psi for Young's modulus.
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