The photooxidative sensitization of bis(-substituted diphenyl)iodonium salts in the radical polymerization of acrylates

• Published in: RSC advances Vol. 9; no. 49; pp. 2849 - 28499
• Main Authors: Balcerak, Alicja, Kabatc, Janina
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 10.09.2019; The Royal Society of Chemistry
• Subjects: Acrylates; Chemistry; Conversion; Dyeing; Electron transfer; Monomers; Polymerization
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c9ra05413h

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 ( R p ) 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. 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.