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Packed-column supercritical fluid chromatography (pSFC), with negative-ion atmospheric-pressure chemical-ionisation (APCI) mass spectrometric (MS) detection has been used to analyse a commercial phenol–formaldehyde (resol) prepolymer. After initial optimisation of the system using a standard dimer species [bis(2-hydroxyphenyl)methane], it was possible to identify positively 34 components in the resin sample, including the starting reagents (phenol and cresol), and a range of dimers, trimers, tetramers and pentamers, with varying phenol/cresol ratios and amounts of methylol substitution. The method requires no pre-separation derivatisation of the resin sample, and a chromatographic run time of ca. 10 min.
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Carrott et al. (1999) studied this question.
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