Study On The Molecular Design Of Photoconductive Compounds For The Irradiation Systems With Visible Or Ultraviolet Light And Their Photophysical Chemistry Properties

With the rapid development of information technology, considerable attention has been paid to 3D holographic date storage, and the research on storage materials is one of the key contents. To the storage materials for holographic date storage, photo-initiative radical polymerization plays an important role and can be initiated by both E-cleavage (typeâ… ) and H-abstraction (typeâ…¡) initiators. Typeâ… photo-initiators undergo E-cleavage to give two radical species. Typeâ…¡photo-initiators, along with hydrogen donors, produce the initiating radicals based on a bimolecular reaction with better optical absorption properties than typeâ… initiators near UV region. However, their induced photo-polymerization process would be relatively slower due to the bimolecular initiation reaction.In order to overcome the existing shortcomings of the typeâ…¡photo-initiators, a lot of research has been exploited to modify their structures and amine co-initiators. These improved photo-initiators showed significant advantages over traditional low molecular weight photo-initiators.The aim of this study is to evaluate the performance of novel spiropyran dyes as UV radical initiator and show their potential application in polymerization system. Three novel spiropyran derivatives (compound 4,5 and 7) containing cationic or cinnamoyl moiety were prepared, and their photochromic properties were characterized by UV-Vis spectroscopy. Spiropyran derivative (chromophore acceptor) was connected with cinnamoyl group (photofunctional acceptor) through a spacer N-dialkyl (co-initiator) intramolelularly. Under UV irradiation, both the photo-induced dye and amine electron-transfer reaction take place and electron transfer process within the dye work well. Spiropyran derivatives containing cationic moiety were more efficient in its quenching process, and the rare of electron transfer increased intramolecularly. Photopolymerization of cationic moiety and triethanolamine (TEA) was tested in the presence of typeâ…¡spiropyran photoinitiators. Some N-monoalkyl, N-dialkyl and N-anisomerous dialkyl aminoanthraquinone nonlinear optical organic compounds were synthesized after molecular design. They are expected to be used as photoinitiators in the photo-initiative radical polymerization under visible light irradiation. N-alkyl aminoanthraquinone with photopolymerisable functional group were synthesized by condensation reaction, all compounds obtained from this study were identified by IR and 1H NMR.Spectrum properties of the compounds were studied. The analysis to the UV-Vis spectrum has showed that they match well with the short-wavelength lasing light emitter. Photopolymerization initiating system composed of spiropyrans or N- alkyl aminoanthraquinones as mentioned above and the radical source of hexaarylbisimidazoles (HABI) was produced. The initiating properties were monitored by Real-time Infrared spectroscopy in order to determine the conversion of double-bond at 810cm-1 and 1640 cm-1. It was found that the system which contains spiropyran residue or N- alkyl aminoanthraquinones exhibited much higher initiating efficiency than the one without having it in the photopolymerization of 2-phenoxyethylacrylate (POEA)/N-vinylcarbazole (NVC).