Abstract
The ability of two-component dyeing photoinitiating systems for the radical polymerization of 1,6-hexanediol diacrylate (HDDA) and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol triacrylate (TMPTA) is presented. The systems under study comprised a hemicyanine dye as a sensitizer and iodonium salts that played a role of a coinitiator. The kinetic parameters of the polymerization reaction, such as the rate of polymerization (Rp) and the degree of conversion of monomer (C%), were estimated. The thermodynamic feasibility of an electron transfer process in the systems studied was verified and calculated using the Rehm–Weller equation. It was found that a benzoxazole derivative in the presence of iodonium salts effectively initiated the polymerization of acrylate monomers. The polymerization rates of about 10−7 s−1 and the degree of conversion of acrylate groups from 20% to 50% were observed. The effects of photoinitiator structures on the initiating ability and spectroscopic properties of sensitizers are described in this article.
Highlights
Photopolymerization is one of the popular technologies used for the production of various types of polymer materials, which are used in various elds
Materials obtained by free radical polymerization (FRP) enable their further practical applications
Due to the lack of reports on neutral hemicyanine dye/ iodonium salt pairs, we decided to develop our study on dyeing photoinitiating systems acting under visible light, which are composed of neutral hemicyanine and diphenyliodonium salts
Summary
Photopolymerization is one of the popular technologies used for the production of various types of polymer materials, which are used in various elds. Due to the lack of reports on neutral hemicyanine dye/ iodonium salt pairs, we decided to develop our study on dyeing photoinitiating systems acting under visible light, which are composed of neutral hemicyanine and diphenyliodonium salts. For this purpose, we have synthesized benzothiazolebased hemicyanine dyes as a blue-light-sensitive sensitizer and used several iodonium salts containing the electrondonation or electron-withdrawing groups for the polymerization of di- and triacrylates. Xiao et al described the photoinitiating abilities of two- and three-component systems for the radical polymerization of TMPTA, containing naphthalimide derivatives as sensitizers, and diphenyliodonium hexa uorophosphate, N-vinylcarbazole, Nmethyldiethanolamine and 2,4,6-tris(trichloromethyl)-1,3,5-triazine as coinitiators. All substrates and solvents necessary for the preparation of coinitiators were purchased form Sigma-Aldrich (Poland) and used without further puri cation
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