Abstract
The 1H and 13C NMR spectra have been analyzed to determine the microstructure of the para-substituted resole type phenol-formaldehyde oligomers based on diphenylolpropane and p-tert-butylphenol. Aromatic ring signals in the 13C spectra have been resolved with the aid of the results of a quantitative analysis of acetates of the studied oligomers and the values of additive increments due to ortho-substitution of the phenol ring by methylol and dimethylene ether groups in the oligomers have been refined. Particular features of the microstructure of these resins are related to the chemical shift of the signal of hydroxyl protons in the NMR spectra. This effect is attributed to the formation of intramolecular H bonds of one sort or another.
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