KINETICS OF PHENOLIC RESOL RESIN FORMATION BY HPLC - 2 - BARIUM HYDROXIDE

The evolution of phenolic resol resin catalysed by barium hydroxide un der controlled temperature, formaldehyde to phenol ratio and water dil utability was quantitatively followed by liquid chromatography. Disapp earance of phenol and formaldehyde and formation of addition products were quantitatively followed during synthesis. Higher molecular specie s formed by condensation reactions were diaryl compounds bonded by met hylene bridges via para,para and ortho,para positions. No ortho, ortho bonds were detected by C-13 n.m.r. spectroscopy. Gas chromatography w as used to follow the evolution of the final resin stored at three tem peratures. Temperatures below zero are advisable for storing purposes of these phenolic resol resins. (C) 1998 Elsevier Science Ltd. All rig hts reserved.