Synthesis and characterization of a thioxanthone derivative photoinitiator with a dynamic disulfide bond and in situ synthesis of AuNps within a polymer matrix

Kazancioglu E. O., Koyuncu U., ARSU N.

Progress in Organic Coatings, cilt.204, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 204
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.porgcoat.2025.109268
  • Dergi Adı: Progress in Organic Coatings
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: AuNps, Disulfide, Nanocomposite, Photoinitiator, Photophysical, Photopolymerization
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

We present the synthesis and characterization of a novel thioxanthone disulfide derivative, dihydroxy thioxanthone disulfide [OH-TX-S-]₂, as a photoinitiator. We emphasize its efficiency in free radical polymerization and its ability to facilitate the in-situ synthesis of gold nanoparticles (AuNps) within a polymer matrix. UV–Vis and fluorescence spectroscopy techniques were used to investigate the photophysical properties of [OH-TX-S-]₂, a new photoinitiator consisting of dynamic disulfide bonds. The fluorescence quantum yield was 0.35 compared to 0.06 for unsubstituted thioxanthone. When irradiated, [OH-TX-S-]₂ generates thiyl radicals, which initiate the photopolymerization reactions of acrylates and methacrylates. Indeed, good conversion percentage values were obtained for photoinitiated polymerization of methyl methacrylate as monoacrylate and also multifunctional acrylates namely epoxydiacrylate diluted with TPGDA and 1,6-Hexanediol diacrylate. Furthermore, its role in the photoreduction of gold salts to AuNps has been established. Scanning electron microscopy (SEM) determined the size, shape, and distribution of the produced AuNps within the polymer matrix. These results collectively indicate the potential of [OH-TX-S-]₂ as both a photoinitiator and a photoreducing agent for the development of advanced materials in functional coatings for various applications.