STUDY OF CURING PROCESS OF RESOLE TYPE PHENOL-FORMALDEHYDE RESINS BY INFRA-RED SPECTROSCOPY
用红外光谱法对热固性酚醛树脂固化过程的研究

The chemical change of four resole type phenol-formaldehyde resins in curing process was studied by infra-red spectroscopy. It was shown that the curing process of resoles, at first, proceeded by condensation reaction of methylol groups, and the formation of dimethylene ether linkage was predominant. During further curing process (150-200°) carbonyl group appeared. The formation of carbonyl group was not caused by the ixidation of methylene group, but was a result of splitting of dimethylene ether linkage. The mechanism of suring process of phenolic resole resins was discussed.