Abstract
With the use of MALDI mass spectrometry and 29Si NMR spectroscopy, the molecular-mass compositions of oligomers prepared via partial acidolysis of PhSi(OMe)3 by acetic acid have been studied. Depending on the molar ratio of mPhSi(OMe)3 and nCH3COOH (m/n), a wide variety of oligophenyl-methoxysiloxanes with average compositions of [(PhSiO1.5) m (OMe0.5)(3 − 2n)/m ] p are formed. Through analysis of the molecular masses (MALDI, GPC) and 29Si NMR spectra of the products, the types of molecular structures have been determined. After 66.67–86.67% completion of the process, the change from linear, branched, cyclic, and polycyclic structures to fully condensed polyhedral structures is observed.
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A. G. Ivanov, V. M. Kopylov, V. L. Ivanova, V. A. Kovyazin, I. B. Sokol’skaya, and I. I. Khazanov, Russ. J. Gen. Chem. 82(1), 66 (2012).
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Original Russian Text © A.G. Ivanov, V.M. Kopylov, V.V. Kireev, R.S. Borisov, K.L. Gerasimov, Yu.V. Bilichenko, 2015, published in Russian in Vysokomolekulyarnye Soedineniya, Ser. B, 2015, Vol. 57, No. 1, pp. 11–17.
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Ivanov, A.G., Kopylov, V.M., Kireev, V.V. et al. Compositions and structures of oligosiloxanes forming during the partial acidolysis of PhSi(OMe)3 . Polym. Sci. Ser. B 57, 9–15 (2015). https://doi.org/10.1134/S1560090415010078
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DOI: https://doi.org/10.1134/S1560090415010078