Abstract
Phenolformaldehyde resin, which is used to make items of glassy carbon hollow ware, contains residual alkaline catalyst and other impurities. Pyrolysis reduces the concentrations of hydrogen and oxygen during condensation and dehydrogenation reactions, which occur between 150 and 1000°C as the resin is converted to a polymeric glassy carbon. Molded samples heat-treated from 150 to 600°C and sprayed samples heat-treated to 1000 and 2500°C were studied using Rutherford backscattering spectrometry (RBS) and Raman spectroscopy. Raman spectroscopy was used to study the structural changes induced by heat treatment. Raman spectroscopy showed that most carbonization occurred at 500 to 600°C while the RBS data from resin samples at each temperature showed that oxygen and sodium concentrations were reduced at higher temperatures.
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