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. 2018 Oct 11;10(10):1129. doi: 10.3390/polym10101129

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© 2018 by the authors.

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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Schematic displaying the general principles of the (a) one-step procedure; and the (b) ‘simultaneous’; (c) ‘sequential’; and (d) ‘chronological’ two-step procedures used in the in situ synthesis of epoxy nanocomposites. The colors of the various solutions are described as follow: The pure epoxy resins are indicated either by light green (monomer solution), dark green (polymer solution), or orange (monomers modified by silane coupling agents (SCA)), the inorganic oxide precursors are indicated by light purple, or dark purple (pre-hydrolyzed), and the SCAs are indicated by red.