Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15 rue Jean Starcky, 68057 Mulhouse CEDEX, France.
Dentsply Sirona, De-Trey-Straβe 1, 78462 Konstanz, Germany.
Molecules. 2019 Aug 11;24(16):2913. doi: 10.3390/molecules24162913.
Diaryliodonium salts are well-established compounds in free radical chemistry and are already used as photoinitiators (free radical or cationic polymerization), but the presence of counter anions is a strong drawback. Indeed, a counter anion is always required (e.g., SbF) leading to potential toxicity issues or release of HF. In the present paper, counter anion-free and fluoride-free aryliodonium salts are proposed, that is, aryliodonium ylides (AY) are studied here as new and efficient additives for radical chemistry and an example is provided for the camphorquinone (CQ)/amine based photoinitiating systems (PISs) for the polymerization of thick (1.4 mm) and thin (20-13 µm) methacrylates under air and blue light irradiation. The newly proposed PISs, for example, CQ/amine/AY, presented excellent polymerization performances and good bleaching properties were obtained after polymerization. Real-time Fourier transform infrared spectroscopy (RT-FTIR) was used to monitor the photopolymerization profiles. The chemical mechanisms involved were investigated using electron spin resonance (ESR).
二芳基碘鎓盐是自由基化学中成熟的化合物，已被用作光引发剂（自由基或阳离子聚合），但抗衡阴离子的存在是一个很大的缺点。事实上，总是需要抗衡阴离子（例如 SbF ），这会导致潜在的毒性问题或 HF 的释放。在本文中，提出了无抗衡阴离子和无氟的芳基碘鎓盐，即芳基碘鎓叶立德（AY）作为自由基化学的新型和高效添加剂进行研究，并提供了一个樟脑醌（CQ）/胺基光引发体系（PIS）用于聚合厚（1.4 毫米）和薄（20-13 微米）甲基丙烯酸酯的实例，在空气和蓝光照射下。新提出的 PIS，例如 CQ/胺/AY，表现出优异的聚合性能，并且在聚合后获得了良好的漂白性能。使用实时傅里叶变换红外光谱（RT-FTIR）监测光聚合曲线。使用电子自旋共振（ESR）研究了所涉及的化学机理。
