In-line monitoring of resorcinol-formaldehyde gelation using fiber optic UV-vis spectroscopy in real time: part I.

ABSTRACT: The sol-gel transition of resorcinol-formaldehyde (RF) solutions in the presence of sodium carbonate as a catalyst was monitored using in-line UV-vis measurements in real time by observing the absorbance changes at various gelation temperatures using a fiber-optic probe. The two absorbance maxima at around 340-400 and 500 nm were caused by different resorcinol derivatives and O-quinone methide intermediates, respectively, which were formed during the gelation. The absorbance was measured until visible turbidity appeared. The turbidity time (t _turb) was determined, and it was found to decrease with increasing gelation temperatures. The general absorbance behaviour and the trend in absorbance value variations in correlation with time and at three different wavelength

SUBMITTER: Kamal Mohamed SM 

PROVIDER: S-EPMC12308710 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature