Photochemistry and photopolymerization activity of novel 4-alkylamino benzophenone initiators-synthesis, characterization, spectroscopic and photopolymerization activity

摘要: Abstract Fifteen novel 4-substituted alkylaminobenzophenones have been synthesized and characterized using NMR, mass spectrometry microanalysis. Their spectroscopic properties determined u.v. absorption phosphorescence analysis the data related to their behaviour on photocuring both Fourier Transform Infra-Red (FTIR) hardness testing in a triacrylate monomer. Absorption spectra are similar those of benzophenone although quantum yields lower with longer emission lifetimes indicative presence some degree charge-transfer lowest excited triplet state. Using FTIR for photocuring, compounds many cases more effective than itself. other hand, all proved be effective; alicyclic amine structures least followed by aliphatic then aromatic amines. For structural analogues, was containing propoxy link substituent an ethoxy link. This difference is ability molecule former case form intra-molecular exciplex ketone group. The less hydrogen atom or electron abstraction reactions. Differences observed methods curing quenching effects oxygen