FLUORESCENCE STUDIES FOR IN SITU MONITORING OF THE HYDROLYSIS AND POLYMERIZATION REACTIONS OF ORGANICALLY–MODIFIED TETRAMETHYLORTHOSILICATE
ABSTRACT: Monitoring of
hydrolysis and condensation polymerization reactions of
tetramethylorthosilicate-organosiloxane have been carried out. Proton transfer
from the excited state of 8-hydroxy-1,3,6- pyrenetrisulfonic acid trisodium
salt (pyranine) to surrounding water molecules was used as a sensitive fluorescence
method for following the kinetics of water consumption during the early stages
of the sol-gel polymerisation process. Changes in water/silane ratio, type of
organosiloxane, mol ratio of organosiloxane to silica precursor and pH affected
markedly the kinetic behavior of the hydrolysis and condensation reaction of tetramethylorthosilicate.
Keywords: hydrolysis, polymerisation,
fluorescence, pyranine, tetramethylorthosilicate, organosiloxane
Author: Eko Sri Kunarti
Journal Code: jpkimiagg050023
