Inhibitory effect of H 3+x PMo 12−x V x O 40 -T on the self-polymerization of methyl methacrylate

Abstract

In this work, a series of molybdovanadophosphoric heteropoly acid quaternary ammonium salts (H3 + xPMo12 − xVxO40-T) were synthesized and employed as a reaction inhibitor in the self-polymerization of methyl methacrylate (MMA). The polymerization inhibition effect of H3 + xPMo12 − xVxO40-T with different number of vanadium atoms and reaction dosages was investigated using differential scanning calorimetry (DSC). It shows that the inhibitory effect was improved with the increasing dosages of H3 + xPMo12 − xVxO40-T, and the polymerization inhibition was also affected by the number of vanadium atoms in the H3 + xPMo12 − xVxO40-T. Furthermore, cyclic voltammograms (CV) was used to probe the mechanism of the inhibition reaction with H3 + xPMo12xVxO40-T. The result of CV indicates that the inhibition reaction is an oxidation–reduction reaction. H3 + xPMo12 − xVxO40-T can react directly with the MMA monomer radicals, which eliminated the MMA monomers, and therefore the self-polymerization of the MMA can be effectively inhibited by H3 + xPMo12 − xVxO40-T.