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Vol 466, No 2 (2016)
- Year: 2016
- Articles: 2
- URL: https://journals.rcsi.science/0012-5016/issue/view/9193
Physical Chemistry
Modification of sulfonated polyphenylquinoxaline by alkali and alkaline earth metal cations
Abstract
Salts of sulfonated polyphenylquinoxaline (SPPQ) containing alkaline earth metal ions—Mg2+, Ca2+, and Ba2+—were synthesized. The paper considers their solubilities, the properties of solutions, and thermal stability in comparison with analogous characteristics of SPPQ salts with alkali metals. The introduction of alkaline earth metal cations into SPPQ affords soluble polymeric salts having high thermal stability. Solutions of SPPQ salts in N-methylpyrrolidone (N-MP) containing Mg2+, Ca2+, and Ba2+ ions do not exhibit polyelectrolyte properties, unlike solutions of SPPQ salts in which the counterions are Li+, Na+, and K+. Solutions of SPPQ and its salts in N-MP can be converted to water-soluble form by dialysis. This opens up new prospects for using the polymeric salts.
29-31
Phase composition and structure of sodium aluminophosphate based glass materials depending on their synthesis conditions
Abstract
The effect of the method of synthesis on the structure of aluminophosphate glasses intended for immobilization of high level waste from uranium–graphite channel reactor spent nuclear fuel reprocessing has been studied by X-ray powder diffraction and Fourier transform IR spectroscopy. Slow cooling in a furnace, both spontaneous cooling in a switched-off furnace and cooling simulating the conditions of glass cooling in their disposal canisters, or additional heat treatment (annealing) led to partial crystallization of glasses with segregation of different modifications of aluminum orthophosphate. For orthoand pyrophosphate based glasses with similar anionic motifs, their phase composition and degree of crystallization depend not so much on the chemical composition of a sample as on its heat treatment history.
32-36