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Authors Kargafard, N. ; Diedrich, N. ; Rupp, H. ; Dohler, D. ; Binder, W. H.
Title Improving kinetics of "click-crosslinking" for self-healing nanocomposites by graphene-supported Cu-nanoparticles
Date 10.04.2018
Number 55166
Abstract Investigation of the curing kinetics of crosslinking reactions and the development of optimized catalyst systems is of importance for the preparation of self-healing nanocomposites, able to significantly extend their service lifetimes. Here we study different modified low molecular weight multivalent azides for a capsule-based self-healing approach, where self-healing is mediated by graphene-supported copper-nanoparticles, able to trigger click-based crosslinking of trivalent azides and alkynes. When monitoring the reaction kinetics of the curing reaction via reactive dynamic scanning calorimetry (DSC), it was found that the click-crosslinking reactivity decreased with increasing chain length of the according azide. Additionally, we could show a remarkable clickreactivity already at 0 °C, highlighting the potential of click-based self-healing approaches. Furthermore, we varied the reaction temperature during the preparation of our tailor-made graphene-based copper(I) catalyst to further optimize its catalytic activity. With the most active catalyst prepared at 700 °C and the optimized set-up of reactants on hand, we prepared capsule-based self-healing epoxy nanocomposites.
Publisher Polymers
Wikidata
Citation Polymers 10 (2018) ID17
DOI https://doi.org/10.3390/polym10010017
Tags trgo copper nanoparticles cuaac crosslinking self-healing nanocomposite

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