A novel biopolymeric photoinitiator based on chitosan and thioxanthone derivative: Synthesis, characterization and efficiency in photopolymerization
作者： Silvano R Valandro , Alessandra L Poli , Tiago Venâncio , Joao Pina , J Seixas de Melo
DOI: 10.1016/J.JPHOTOCHEM.2016.04.019
关键词:
摘要: Abstract A novel biopolymeric photoinitiator was synthetized from N -phthaloyl chitosan. The 10-oxo-10H-dibenzene thiopyran-3-4-dicarboximide/chitosan (TXICh) structure characterized by 1D ( 1 H and 13 C) 2D COSY, C HSQC HMBC) NMR experiments. TXICh showed absorption in a wide region of the visible, with bands at 385, 450 540 nm. Fluorescence measurements three emitting states lifetimes 3, 0.612 0.021 ns. Transient same magnitude were found for femtosecond time-resolved pump-probe transient spectroscopy. triplet formation observed flash photolysis. This excited state is responsible producing radicals, which initiate photopolymerization. efficiency as checked photopolymerization kinetics TEGDMA using photocalorimetry (photo-DSC). ability to act radical different wavelengths confirmed.
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