Effect of the chemical grafting of epoxy resin onto organomodified montmorillonite on the structure and heat resistance of an epoxy nanocomposite |
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Authors: | A P Korobko S V Krasheninnikov I V Levakova S N Drozd S N Chvalun V V Nikolaev M A Shcherbina S V Cherdyntseva |
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Institution: | 1.Karpov Institute of Physical Chemistry,Moscow,Russia;2.OOO Galen,Cheboksary,Chuvash Republic, Russia |
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Abstract: | It is shown that the noncatalyzed chemical grafting of an epoxy oligomer onto the surface of montmorillonite platelets may
proceed via the reaction between the epoxy groups and the hydroxyl groups of the organic modifying agent of the layered aluminosilicate.
The effect of grafting on the structure and heat resistance of the cured epoxy nanocomposite is studied. Complete exfoliation
of montmorillonite particles into individual platelets is shown to be a necessary but insufficient condition for increasing
the glass-transition temperature of the nanocomposite relative to that of the initial matrix. A much higher contribution to
the increase in the glass-transition temperature is ensured by grafting of epoxy molecular chains onto the surface of aluminosilicate
platelets; i.e., strong covalent matrix-aluminosilicate bonds form in addition to physical bonds, a process that entails development
of a thicker three-dimensional network. |
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