Triarylsulfonium Hexafluoroantimonate Salts as Initiators to Induce Surface Modification of Natural Biopolymers
Versace, Davy-Louis, et al. Green chemistry, 2012, 14(3), 788-798.
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) is a biodegradable and biocompatible polymer that can be graft-copolymerized with 2-hydroxyethylmethacrylate (HEMA) and methacrylic acid (MAA) for modification. During the synthesis process, triarylsulfonium hexafluoroantimonate salts (TAS) were used as a cationic photoinitiator to initiate graft modification of the PHBHV surface under UV irradiation. Photografting procedures · The PHBHV film and glass slide were both cut into 2 × 2 cm2 pieces. Using a micropipet, 300 μl of a 4 M monomer solution in distilled water (containing triarylsulfonium hexafluoroantimonate salts at a concentration of 9 mM) was added onto the film to create a thin and even liquid layer. · The assembly of PHBHV film, monomer, and glass was then exposed to UV light at room temperature using a Lightningcure LC8 (L8251), which had a mercury-xenon lamp (200 W) connected to a flexible light guide. · The end of the guide was positioned 12 cm away from the sample, with the maximum UV light intensity at the sample measuring 180 mW cm-2 in the 250-450 nm range, as determined by radiometry. · The PHBHVs were then micropatterned by photografting HEMA through a photomask.
Triarylsulfonium Hexafluoroantimonate Salts for 3D Printing Photosensitive Resin
Huang, Biwu, et al. Journal of Wuhan University of Technology-Mater. Sci. Ed. 2017, 32(3), 726-732.
A hybrid photosensitive resin was developed, which is an epoxy-acrylate hybrid system photosensitive resin that undergoes free radical polymerization and cationic polymerization under ultraviolet (UV) laser. The formula ingredients of this photosensitive resin include EA-612, TPGDA, EO TMPTA, ERL-4221, Polyol-0301, Irgacure184 and triarylsulfonium hexafluoroantimonate salts (Ar3SSbF6). The mechanism of photosensitive resin curing and film formation · When mixed photosensitive resin is cured to form a film, there are two reaction mechanisms, namely cationic polymerization mechanism and free radical polymerization mechanism. · Cationic UV curing was performed using triarylsulfonium hexafluoroantimonate as the initiator. In the presence of UV laser, the salt produces strong Bronsted acid through photolysis. The acid (HSbF6) initiates cationic polymerization of alicyclic diepoxides. The ring of the epoxy group is opened, and in the FTIR spectrum of the UV cured film, the characteristic band of the epoxy group disappears. · Free radical UV curing is mainly performed using Irgacure651 as the initiator. In the presence of UV laser, Irgacure184 generates free radicals through photolysis. Free radicals initiate the free radical polymerization of acrylate, and the C=C double bond of acrylate is broken.
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Versace, Davy-Louis, et al. Green chemistry, 2012, 14(3), 788-798.
Huang, Biwu, et al. Journal of Wuhan University of Technology-Mater. Sci. Ed. 2017, 32(3), 726-732.
