Characterization and formation mechanism of the precipitates generated by irradiation of dicyclohexano-18-crown-6 aqueous solution |
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| Authors: | Chuhong Yu Jing Peng Jiuqiang Li Maolin Zhai |
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| Institution: | 1. 3B’s Research Group – Biomaterials, Biodegradable and Biomimetic, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark 4806-909 Taipas, Guimarães, Portugal;2. ICVS/3B’s PT Government Associated Laboratory, Braga, Guimarães, Portugal;3. REQUIMTE/CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal |
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| Abstract: | Dicyclohexano-18-crown-6 (DCH18C6) aqueous solution was irradiated using 60Co source and precipitates containing yellow transparent blocks (PA) and powders (PB) were obtained. TGA analysis confirms that both PA and PB have higher thermal stability than DCH18C6. Both DSC and GPC results suggest that PA might be oligomer and PB were ultrahigh molecular weight polymers. The FTIR spectra indicate that both PA and PB have similar chemical structures containing carboxyl and hydroxyl groups. By using scavengers, it was found that the formation of PA and PB is attributed to the radiation-induced radical polymerization of DCH18C6, and ·OH radical produced by water radiolysis might be a critical species for the formation of PA and PB. These studies help to understand the radiation chemistry behavior of DCH18C6 in the reprocessing of nuclear fuel. |
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