Title
Photopolymerization and 3D/4D applications usingnewly developed dyes: Search around the naturalchalcone scaffold in photoinitiating systems
Author
Mohamed G. El-Desouky
Year
2021
Journal
Dyes and Pigments
Abstract
Two series of 18 newdyesselected from in silico molecular design (i.e. through molecular orbital calculations) weresynthesizedand used in conjunction with an amine (i.e. ethyl l,4-(dimethylamino)benzoate, EDB) and an iodonium salt (bis(4-tert-butylphenyl)iodoniumhexafluorophosphate,Iod) asphotoinitiating systems (PISs) capable of initiating the free radical polymerization of polyethylene glycol(600) diacrylate (PEG-diacrylate) and the cationicpolymerization of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (EPOX) viaan oxidation–reduction reactionmechanism.Even thoughmost of these dyes exhibitexcellent light absorption properties below 380nm, the photopolymerization efficiency of acrylates carried out under LED@405 nmare much betterthan that reached with aLED@375 nmboth in thin films and thick films.Furthermore, all of them can also boostthe cationic polymerization of EPOX upon LED irradiation at 405 nm, in the presence of
an iodonium salt and an amine. More interestingly, stereoscopic 3D patterns weresuccessfully fabricated by the laser writing technique which demonstratedreversible swelling properties andreversibleshape-memory effectsinduced via swelling and dehydration for the access to 4D printing
Instrument
V-730,FT/IR-4100
Keywords
Silico, molecular, orbital, PISs,