Photochemistry and photoinduced chemical crosslinking activity of type I & II co-reactive photoinitiators in acrylated prepolymers

A comparative FTIR study of thermal and photo-polymerization processes in hybrid sol–gel films

“…The reaction in S2 films is forming an amide whose FTIR vibrational mode is expected in the range where we found the new absorption band [19]. Irgacure Ó 2959 belongs to Norrish Type I class [20] of photoinitiators that form initiating radicals of the polymerization upon a direct photofragmentation induced by the light absorption. A benzoyl and an alkyl radical are produced upon fragmentation of Irgacure Ó 2959 and both can induce polymerization of the acrylate groups in MPTMS.…”

Photocrosslinkable biodegradable responsive hydrogels as drug delivery systems

“…This compound is a ␣-hydroxy alkylphenone, a Type I photoinitiator, which, when exposed to UV radiation, undergoes a photofragmentation process (␣ or ␤ cleavage) originating a benzoyl radical and an alkyl radical (one with a hydroxyl and the other an isopropanol radical [28]. From these two, the benzoyl radical is the main responsible for the initiation of the polymerization [29]. The scheme representing the reaction steps involved in the preparation of the films is presented in Fig.…”

Solubility of Irgacure® 2959 photoinitiator in supercritical carbon dioxide: Experimental determination and correlation

“…Photochemical (ultraviolet or visible light) initiated polymerization reactions are a well-established technology for many industrial applications like offset lithographic and flexographic inks, screen printing, metal decoration, wood coatings, pigmented coatings for textile applications and pigmented primary and secondary optical fiber coatings [4]. Photopolymerization is also commonly used in a broad range of biomedical applications such as dentistry, implants, scaffolds, bioadhesives and drug delivery systems [5,6].…”