Abstract
In this work, the products of the interaction of polyvinylsilsesquioxane (PVS) and polyvinyl-polydimethylsiloxane with tris(3-chlorosulfenyl-2,4-pentanedionate) aluminum were studied. The substances were isolated through the gelation stage, and after drying, insoluble crosslinked polymers are formed. Using data from thermogravimetry (TGA), diffractometry and positron annihilation spectroscopy (PAS), the structure and composition were investigated for the first time obtained polyaluminoorganylsiloxanes. The diffractometry data demonstrated that the obtained metallochelates are spatial mesomorphic polymers with a fractal structure. Based on the calculated data of the PAS, it is shown that the annihilation of positronium in the polymer matrix occurs on oxygen, while the size of the resulting fractal turns out to be less than the molecular volume of the elementary link. The results of the thermogravimetric study indicate a greater thermal stability of aluminum compounds compared to the chromium derivatives described earlier. According to scanning electron microscopy (SEM), it was found that the surface of the formed metallochelates corresponds to the characteristic monolithic morphology of xerogels.
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N.P. Shapkin wrote the main text of the article. K.A. Pervakov performed the synthesis of substances and conducted diffractometric and thermogravimetric studies. V.I. Razov conducted positron annihilation measurements and calculations. A.N. Fedorets conducted research on composites using a scanning electron microscope. E.K. Papynov provided text editing and consulting.
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Shapkin, N.P., Pervakov, K.A., Razov, V.I. et al. Spatial Polyaluminoorganosiloxanes: Synthesis and Structural Features. Silicon 16, 5161–5175 (2024). https://doi.org/10.1007/s12633-024-03068-8
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DOI: https://doi.org/10.1007/s12633-024-03068-8