Abstract
Methacrylate-containing silsesquioxane–siloxane oligomers with Mw = (2–20) × 103 determined by gel permeation chromatography (GPC) are synthesized by acidohydrolytic copolycondensation of γ‑methacryloxypropyltrimethoxysilane and diorganodialkoxysilanes. According to the data of 29Si NMR spectro-scopy, the molecules of these oligomers contain silsesquioxane units (RSiO1.5)n, where R is a γ-methacryloxypropyl radical, and mixed cyclic structures of the (RSiO1.5)m(R'R''SiO)p type, where R' is CH3 and R'' is CH3 or C6H5, with linear diorganosiloxane fragments added to them. The introduction of 6 wt % silsesquioxane–siloxane oligomers into a filled base dental compound based on a mixture of bismethacrylates increases its mechanical characteristics by more than a factor of 1.25–1.75 with a simultaneous substantial decrease in the polymerization shrinkage, water uptake, and water solubility.
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ACKNOWLEDGMENTS
We are grateful to M.V. Gorlov for assistance in this work.
Funding
This work was financially supported by the Ministry of Science and Higher Education of the Russian Federation as part of the Federal Targeted Program “Research and Development in the Priority Areas of the Science and Technology Sector of Russia for 2014–2020” (unique project identifier RFMEFI57417X0171).
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Translated by E. Boltukhina
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Bredov, N.S., Bykovskaya, A.A., Van Tuan, N. et al. Oligomeric Silsesquioxane–Siloxane Modifiers for Polymer Dental Compounds. Polym. Sci. Ser. B 62, 182–189 (2020). https://doi.org/10.1134/S1560090420030033
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DOI: https://doi.org/10.1134/S1560090420030033