Abstract
New metalloorganosiloxanes (MOSs) were prepared by hydrosilylation of Ti(IV), Zr(IV), Hf(IV), and V(IV) acetylacetonates with α,ω-dihydrooligodimethylsiloxane. The reaction products were studied by DTGA and IR spectroscopy. The effect of the metallosiloxanes obtained on the heat resistance of composites based on low-molecular-mass polydimethylsiloxane rubber (SKTN) containing various types of reinforcing fillers was examined. Introduction of MOSs in an amount of 7 × 10–3 g/(kg blend) increases the gelation onset time of the SKTN-based compound from 5 to 54 h at 250°С. In addition, the resistance of the silicone vulcanizates to thermal oxidative degradation is enhanced, and the vulcanized rubber samples preserve satisfactory physicomechanical characteristics after prolonged heat treatment. The organosilicon liquids modified with the synthesized thermal stabilizers exhibit high levels of dielectric characteristics and heat resistance in the temperature interval from 25 to 270°С. The synthesized MOSs are soluble in polyorganosiloxanes, which allows uniform distribution of small amounts of the modifier in the polymer. The presence of metals with high coordination number in the thermal stabilizer macromolecules allows efficient inactivation of free radicals in a wide temperature interval. The filled silicone vulcanizates obtained can be used as heat-resistant cable insulation and high-temperature sealants, and MOS-modified organosilicon liquids can be used as analogs of mineral oils for power transformers.
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REFERENCES
Dolgov, O.N., Voronkov, M.G., and Grinblat, M.P., Kremniiorganicheskie zhidkie kauchuki i materialy na ikh osnove (Organosilicon Liquid Rubbers and Materials Based on Them), Leningrad: Khimiya, 1975.
Delebecq, E., Hamdani, S., Raeke, J., Lopez-Cuesta, J-M., and Ganachaud, F., ACS Appl. Mater. Interfaces, 2011, no. 3, рр. 869–880.
Markuze, I.Yu. et al., Vse Mater. Entsikl. Sprav., 2010, no. 12., pp. 12–18.
Woerner, С., US Patent 6737458, March 18, 2004.
Randall, L. and Carter, R.L., US Patent 7651642, Jan. 26, 2010.
Kopylov, V.M., et al., Izv. Tul’sk. Gos. Univ. Estestv. Nauki, 2014, vol. 1, no. 2, pp. 126–133.
Hanu, L.G, Simon, G.P., and Cheng, Y.B., Polym. Degrad. Stab., 2006, vol. 9, рр. 1373–1379.
Liu, T., Zeng, X., Lai, X., Li, H., and Wang, Y., Polym. Degrad. Stab., 2020, vol. 171, рр. 1009–1026.
Kostyleva, E.I., Novikov, A.N., and Rakhmanova, P.A., Yuzhno-Sib. Nauchn. Vestn., 2019, no. 4, pp. 140–145. http://s-sibsb.ru/images/articles/2019/4/1/S-SibSB_Issue_28-140-145.pdf.
Kostyleva, E.I. and Novikov, A.N., Yuzhno-Sib. Nauchn. Vestn., 2021, no. 6, pp. 30–34. http://s-sibsb.ru/images/articles/2021/6/S-SibSB_Issue_40-30-34.pdf.
Funding
The study was supported by the grant of the Tula oblast government in the field of science and engineering (resolution no. 541 of September 10, 2020) and with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Laboratory of Ionic Materials, project no. FSSM-2021-0014.
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Kostyleva, E.I., Novikov, A.N., Ilyina, T.A. et al. Heat-Resistant Polyorganosiloxane Dielectrics. Russ J Appl Chem 95, 1169–1173 (2022). https://doi.org/10.1134/S1070427222080122
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DOI: https://doi.org/10.1134/S1070427222080122