While the physical properties of polymer solution have been extensively investigated, less is explored at the vicinity of vitrification due to the experimental difficulty. In this study, we analyzed polymerization-induced vitrification during bulk polymerization of methyl methacrylate. Dielectric spectroscopy captured vitrification caused by the change of polymer concentration at a constant temperature. Our study shows that the polymerization solution becomes heterogeneous at the vicinity of vitrification. In addition, this heterogenization coincides with the reaction acceleration classically known as the Trommsdorff effect.
