Identification of Free Radicals Generated by Different Curing Modes in a Dental Resin Cement

Impact of adhesive primer and light‐curing on polymerization kinetics of self‐adhesive resin cement in association with free radical reaction

“…The spectra simulation followed by least‐square fitting revealed that RI and RIII were present at concentrations of approximately 90% and 10%, respectively. This finding contradicts previous reports [29, 32], in which the intensities of RI and RIII were found at 10% and 90%, respectively. This discrepancy is most probably attributable to the different calculation methods used.…”

“…However, not all free radicals were necessarily involved in the propagation of polymerization; therefore, the radical concentration did not completely correlate with the other two parameters. For instance, RIII generated by hydrogen abstraction [28,29] is thought to be more stable than RI, and as such, RIII would not cause a polymerization chain reaction [25,28]. In addition, some RIs react with each other, resulting in recombination and/or disproportionation (i.e., termination of the chain reaction) [28].…”

“…The chemical structures of RI and RIII determined in previous studies are shown in Figure 1C [25,28]. The spectra simulation and fitting were performed on the assumption that the spectra of RI and RIII are anisotropic and isotropic, respectively, according to a previous study [29]. The quality of the fitting was controlled to reach a root-mean-square deviation (RMSD) of < 0.05.…”

Segmented Polyurethane Elastomers with Mechanochromic and Self‐Strengthening Functions

“…In the EPR spectrum of a compressed SPU‐1 film, several radicals were detected (Figure 4 a). We assumed that the obtained EPR spectrum was composed of CF radicals (one broad line) [17, 18] and radicals derived from methacrylate (9 + 5 lines), [34–36] and a simulation and fitting of the spectrum were conducted based on this assumption (Table S2, Figure S15) [37] . The resulting simulated spectrum matched well with the experimental data, thus supporting the notion that these radicals are present.…”

Segmented Polyurethane Elastomers with Mechanochromic and Self‐Strengthening Functions

“…In the EPR spectrum of a compressed SPU-1 film, several radicals were detected (Figure 4 a). We assumed that the obtained EPR spectrum was composed of CF radicals (one broad line) [17,18] and radicals derived from methacrylate (9 + 5 lines), [34][35][36] and a simulation and fitting of the spectrum were conducted based on this assumption (Table S2, Figure S15). [37] The resulting simulated spectrum matched well with the experimental data, thus supporting the notion that these radicals are present.…”