Multifunctional hydrophobic coatings based on siloxane polymers with branched perfluoroalkyl substituents: Fast, simple and ecologically safe synthesis in active media

Drozdov, F.V.; Krapivko, A.L.; Cherkaev, G.V.; Gervits, L.L.; Yashtulov, N.A.; Kalinina, A.A.; Muzafarov, A.M.

Авторы: Drozdov Fedor V., Krapivko Alena L., Cherkaev Georgij V., Gervits Lev L., Yashtulov Nikolaj A., Kalinina Alexandra A., Muzafarov Aziz M.
Журнал: Journal of Organometallic Chemistry
Том: 921
Год издания: 2020
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 121398
DOI: 10.1016/j.jorganchem.2020.121398
Аннотация: This article discusses the synthesis of polyorganosiloxanes with 1,1,1,2,2,3,3-heptafluoro-4,4-bis(trifluoromethyl)pentyl (Rf ¼ CF3CF2CF2C(CF3)2(CH2)3-) perfluoroalkyl substituents for the sake ofhydrophobic coatings. Using perfluoroalkyl di- and trifunctional alkoxysilane derivatives, linear andbranched siloxanes were obtained. The main emphasis of this work based on the simplicity of theproposed condensation approach in the active medium, the environmental component of the applicationof alkoxysilanes instead of toxic chlorosilanes, and the low cost and harmlessness of the perfluorinatedcompounds used. Varying the nature of the active medium, the ratio of reagents and temperature, it wasshown that the polymers with the highest molecular weight (Mn ˃ 40,000) are obtained by refluxing thereaction mixture for 40 h in the ratio RfSi(OEt)3 þ СH3COOH ¼ 1:15. The hydrophobizing ability of all theobtained polymers was tested by measuring the contact angle (q) on glass and aluminum. Branchedpolymers with Mn ¼ 37,600 and 42,000 showed the best results (q ˃ 108). In addition, the work shows theprospects of hydrophobization ability of epoxy resins with the copolymers of triethoxysilane withbranched perfluoroalkyl substituents and phenyltriethoxysilane in comparison with their knownanalogs.
Добавил в систему: Гервиц Лев Львович

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Multifunctional hydrophobic coatings based on siloxane polymers with branched perfluoroalkyl substituents: Fast, simple and ecologically safe synthesis in active mediaстатья

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