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2.1. Materials

OS Olga Serenko
UA Ulyana Andropova
NT Nadezhda Tebeneva
MB Mihail Buzin
EA Egor Afanasyev
AT Aleksander Tarasenkov
SB Sergey Bukalov
LL Larisa Leites
RA Rinat Aysin
LN Lev Novikov
VC Vladimir Chernik
EV Ekaterina Voronina
AM Aziz Muzafarov
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PI based on 4,4′-(9-fluorenylidene)dianiline and 3,3′,4,4′-diphenyl oxide tetracarboxylic acid has been used [43]. The molecule structure is given in Figure S1. The density of PI was 1.38 g/cm3 [42].

Tris-(methyldiethoxysiloxy)aluminum (below Al-MDES), tris-(methyldiethoxysiloxy)iron (Fe-MDES), tris-(3-aminopropyldiethoxysiloxy)chromium (Cr-MDES), tetrakis-(methyldiethoxysiloxy)zirconium (Zr-MDES), tetrakis-(methyldiethoxysiloxy)hafnium (Hf-MDES) and pentakis-(methyldiethoxysiloxy)niobium (Nb-MDES) have been used as precursors of the dispersed phase of the composites. Precursors were synthesized according to known methods [40]. The structural formulas of the compounds are given in Figure S2.

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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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