Dynamic effects affecting the EPR spectra of radicals trapped in photopolymerized multifunctional acrylate monomers

Two main interpretations are proposed in the literature for the EPR spectra due to radicals produced during the photopolymerization of multifunctional monomers. Different \u3b2-methylene proton configurations undergo fast exchange in the 'dynamic' model, whilst they simply coexist in the 'static' model. We report new experimental results suggesting that both the proposed models are valid, though in different physical situations