Alkoxy-terminated polydimethylsiloxanes – The missing member of the PDMS family

Belikova, I.I.; Bezlepkina, K.A.; Aristova, V.A.; Krylov, F.D.; Ardabevskaia, S.N.; Uliankin, R.V.; Frank, I.V.; Zubova, V.Y.; Minyaylo, E.O.; Anisimov, A.A.; Muzafarov, A.M.; Milenin, S.A.

Авторы: Belikova I.I., Bezlepkina K.A., Aristova V.A., Krylov F.D., Ardabevskaia S.N., Uliankin R.V., Frank I.V., Zubova V.Yu, Minyaylo E.O., Anisimov A.A., Muzafarov A.M., Milenin S.A.
Журнал: Reactive and Functional Polymers
Том: 220
Год издания: 2026
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 106621
DOI: 10.1016/j.reactfunctpolym.2025.106621
Аннотация: Polydimethylsiloxanes with alkoxysilyl functional groups are in demand due to their high reactivity in hydrolysis, condensation, and heterofunctional condensation reactions, opening up their potential application in the production of sealants, gaskets, and coatings. This study focuses on the preparation of polydimethylsiloxanes with terminal alkoxy groups by opening octamethylcyclotetrasiloxane in an alcohol solution in the presence of sodium methoxide as an initiator. The alcohol acts as a solvent, a transfer agent, and a chain terminator. The influence of catalyst concentration and the amount of alcohol used on the reaction progress and the molecular weight characteristics of polydimethylsiloxanes with terminal methoxy groups were studied. As a result, optimal process conditions were selected: a 50 % solution of octamethylcyclotetrasiloxane in methanol in the presence of 3 mol% catalyst. The reproducibility and scalability of the method were demonstrated, yielding over 100 g of polydimethylsiloxanes with terminal methoxy groups. The possibility of reusing the methanol phase containing cyclic products and sodium methoxide was demonstrated. A series of polydimethylsiloxanes with various terminal alkoxy groups, such as those with allyloxy groups, were obtained. The structure of the resulting polydimethylsiloxanes was established and confirmed using 1H, 29Si, 1Hsingle bond29Si HMBC NMR spectroscopy, GPC analysis, and MALDI-TOF spectrometry. The obtained results can have a positive impact on the development of the field of synthesis of functionalized polysiloxanes and materials based on them in the near future.
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Alkoxy-terminated polydimethylsiloxanes – The missing member of the PDMS familyстатья Исследовательская статья

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