THE STUDY OF THE INTERACTION OF ALUMINUM ACETYLACETONATE WITH POLYPHENYLSILSESQUIOXANE WITH THE HELP OF MECHANOCHEMICAL ACTIVATION

Abstract

The interaction of polyphenylsilsesquioxane with aluminum acetylacetonate under conditions of mechanochemical activation in a Pulverisette 6 planetary monomill with a frequency of 600 rpm for three minutes was studied. The ratio of the nozzle mass to the payload mass was 1.8. Soluble polyaluminophenylsiloxanes with an aluminum content of 2.7% to 7.3% have been obtained. The obtained results are compared with the results of mechanochemical syntheses based on aluminum oxide and polyphenylsilsesquioxane. It has been established that when using aluminum acetylacetonate, the mass fraction of soluble polyaluminophenylsiloxane and the aluminum content in it increase in comparison with similar syntheses in which aluminum oxide was used. The dependence of the composition of the obtained products on the initial molar ratio of polyphenylsilsesquioxane and aluminum acetylacetonate is shown. It has been established that at the initial ratio Si:Al = 1:1, a fraction with a composition close to the specified one is formed. An increase in the molar fraction of aluminum acetylacetonate in the initial mixture by a factor of two with respect to polyphenylsilsesquioxane leads to a decrease in the aluminum content in soluble fractions, the absence of a fraction with a given ratio of silicon to aluminum, and the appearance of an insoluble fraction. It has been suggested that an increase in the workload of the activator hindered the diffusion processes and hindered the interaction of the reagents. The composition of the products obtained was studied by elemental analysis, IR and NMR spectroscopy, and electron microscopy. Using the method of electron microscopy of one of the soluble fractions, it was shown that the content of silicon atoms on the surface is higher, and aluminum atoms are lower than the average values obtained in the course of chemical elemental analysis. The difference in the composition of the outer and inner layers is apparently associated with the globular structure of the polymer, which was detected using a scanning electron microscope.