The objective of this study was to evaluate the coumarin-based iodonium hexafluoroantimonate (P3C-Sb) in the polymerization kinetics of an experimental model adhesive resin both in presence of solvent and acid monomer content. A monomer mixture based on Bis-GMA, TEGDMA and HEMA was used as a model adhesive resin. Initially a screening was performed to evaluate P3C-Sb concentrations (0.25, 0.50, 1, 2, 4 mol%). Four photoinitiator systems using P3C-Sb at 2 mol% were evaluated: CQ + EDAB (control), P3C-Sb + CQ, P3C-Sb + EDAB and P3C-Sb + EDAB + CQ. Additionally, the performance of the photoinitiator systems in the presence of ethanol and acidic monomer at four different concentrations (0, 10, 20, 40 wt%) were evaluated. Real-time Fourier transform infrared spectroscopy was used to evaluate degree of conversion (DC) and rate of polymerization (RP). The ternary initiation system P3C-Sb + CQ + EDAB showed similar DC and RP to CQ + EDAB into the model adhesive resin without ethanol, however, in the presence of solvent, P3C-Sb + CQ + EDAB showed the highest polymerization kinetics. An inhibitory polymerization effect was observed when a solvent was introduced to adhesive resin using CQ + EDAB. Polymerization reaction was affected by the presence of acidic monomer irrespective of initiation system used. Adhesive resins with CQ + EDAB and P3C-Sb + CQ + EDAB as initiation systems showed similar DC to CQ + EDAB in presence of acidic monomer. The use of P3C-Sb as a third component of the initiation system seems to be an interesting alternative to improve the polymerization kinetics of simplified dental adhesives which showed to be less sensitive to the residual presence of solvent before photoactivation and it was similar polymerization behavior to CQ + EDAB in presence of acidic monomer.

中文翻译：

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香豆素基六氟锑酸碘鎓作为实验性牙科胶粘剂树脂的替代光引发剂

这项研究的目的是在溶剂型和酸性单体含量均存在的情况下，在实验模型粘合剂树脂的聚合动力学中评估基于香豆素的六氟锑酸碘鎓（P3C-Sb）。使用基于Bis-GMA，TEGDMA和HEMA的单体混合物作为模型粘合剂树脂。最初进行筛选以评估P3C-Sb浓度（0.25、0.50、1、2、4摩尔％）。评估了使用2摩尔％的P3C-Sb的四种光引发剂系统：CQ + EDAB（对照），P3C-Sb + CQ，P3C-Sb + EDAB和P3C-Sb + EDAB + CQ。另外，评估了在四种不同浓度（0、10、20、40 wt％）的乙醇和酸性单体存在下光引发剂体系的性能。实时傅里叶变换红外光谱用于评估转化度（DC）和聚合速率（RP）。在没有乙醇的情况下，三元引发体系P3C-Sb + CQ + EDAB表现出与CQ + EDAB相似的DC和RP，但在溶剂存在下，P3C-Sb + CQ + EDAB表现出最高的聚合动力学。当使用CQ + EDAB将溶剂引入粘合剂树脂中时，观察到抑制聚合作用。无论使用何种引发体系，聚合反应均受酸性单体的影响。以CQ + EDAB和P3C-Sb + CQ + EDAB为引发剂的粘合树脂在酸性单体存在下显示出与CQ + EDAB相似的DC。