A titanocene derivative (bis(cyclopentadienyl)titanium(IV) dichloride Cp₂TiCl₂), for visible light induced polymerization of cationic resins working through a free radical promoted process is presented. This new photoinitiating system is based on the Cp₂TiCl₂ free radical initiator, a silane (tris(trimethylsilyl)silane: TTMSS), and an onium salt (diphenyliodonium hexafluorophosphate: Ph₂I⁺) and appears suitable under long wavelength irradiation (λ > 400 nm). The polymerization reaction is highly efficient in aerated conditions (almost 100% conversion) and dramatically better than in laminate. The system works under exposure to a Xe lamp, a diode laser or a household LED bulb. The mechanisms are investigated by ESR experiments. The specific role of the generated free radicals is highlighted.

中文翻译：

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关于双（环戊二烯基）钛（IV）二氯化物在可见光诱导的开环光聚合中的应用

提出了钛茂衍生物（双（环戊二烯基）钛（IV）二氯化物Cp ₂ TiCl ₂），其用于可见光诱导的通过自由基促进过程的阳离子树脂的聚合。这种新的光引发体系基于Cp ₂ TiCl ₂自由基引发剂，硅烷（三（三甲基甲硅烷基）硅烷：TTMSS）和鎓盐（六氟磷酸二苯基碘鎓：Ph ₂ I ⁺）并适合在长波长辐射（λ> 400 nm）下使用。聚合反应在充气条件下（几乎100％的转化率）非常有效，并且比层压板要好得多。该系统可在氙气灯，二极管激光器或家用LED灯泡下工作。通过ESR实验研究了机理。突出了所产生的自由基的具体作用。