Abstract
AQUEOUS suspensions of finely ground phenol formaldehyde, resorcinol formaldehyde and phloroglucinol formaldehyde resins gave potentiometric titration curves each of which showed an inflexion at a pH between 11.0 and 12.0. The amounts of phenolic hydrogen in the three resins indicated by these inflexions were in approximate agreement with the values, 893, 1,563 and 2,083 milliequivalents per 100gm. calculated from the formulæ, C6H2(OH)(CH2)1.5, C6H(OH)2(CH2)1.5, and C6(OH)3(CH2)1.5, of the repeat units contained in the three resins respectively
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References
Marshall, C. E., and Bergman, W. E., J. Amer. Chem. Soc., 63, 1911 (1941).
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MITRA, R., DUBE, S. Acid Character of Some Phenolic Resins in Relation to their Structure. Nature 176, 79–80 (1955). https://doi.org/10.1038/176079a0
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DOI: https://doi.org/10.1038/176079a0
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