High-Performance Thiadiazole Derivatives as a Nontoxic Components of Initiating Systems for the Obtaining of New Generation Composites

This paper presents the usefulness of new derivatives of 2,1,3-benzothiadiazole (2,1,3-BTD) as photosensitizers for diaryliodonium salts to initiate various types of photopolymerization processes using UV and Vis-LED light sources. The usefulness of the compounds was proved for initiating cationic photopolymerization of epoxy monomers, free-radical photopolymerization of acrylate monomers, and hybrid photopolymerization. The next stage of this study was to obtain 3D prints using the selected compositions. The possibility of initiating the photopolymerization process of resins with CeO2 nanoadditive was also examined, and the usefulness of obtaining photocurable composites was assessed. The cytotoxicity of the new derivatives of 2,1,3-benzothiadiazole was tested using the MTT assay, and the results showed the low toxicity of the new 2,1,3-BTD. The use of 2,1,3-benzothiadiazole derivatives in combination with iodonium salts increases the efficiency of process photopolymerization initiation, while opening the possibility of obtaining three-dimensional structures in 3D printing using digital light processing technology (DLP).