FORMATION OF 2-DIMENSIONAL NETWORKS OF OLIGOEPOXIDE IN LANGMUIR MONOLAYERS ON THE SURFACE OF HETEROPOLYACID AQUEOUS-SOLUTIONS

The kinetics of chemical transformations in monolayers of an epoxy oli gomer on the surface of aqueous solutions of phosphotungstic acid was studied Two-dimensional polymerization of the oligomer resulted in a c rosslinked polymer, as was demonstrated using the surface balance tech nique, FTIR spectroscopy, and gel-sol analysis. The weight fraction of the polymer in the monolayer was 85% after 24 h. It was established t hat the polymerization process had a topochemical character, resulting in an increase in the monolayer limiting area by a factor of 4.5 and the monolayer collapse pressure by a factor of 16. In the course of po lymerization, a mixed nanostructured monolayer was formed from an epox y polymer and heteropolyanions, which were immobilized inside the cros s-linked domains of the two-dimensional matrix and retained the Keggin structure. When the polymerization was carried out on the surface of a subphase with a neutralized heteropolyacid, the epoxy oligomer was n ot polymerized and no heteropolyanions were incorporated into the olig omer monolayer.