Abstract
Influence of different graphite-based nanofillers on crosslinking reaction of resorcinol, as induced by hexa(methoxymethyl)melamine, is studied. Curing reactions leading from low molecular mass compounds to crosslinked insoluble networks are studied by indirect methods based on Differential Scanning Calorimetry. Reported results show a catalytic activity of graphene oxide (eGO) on this reaction, comparable to that one already described in the literature for curing of benzoxazine. For instance, for an eGO content of 2 wt %, the exothermic crosslinking DSC peak (upon heating at 10 °C/min) shifted 6 °C. More relevantly, oxidized carbon black (oCB) is much more effective as catalyst of the considered curing reaction. In fact, for an oCB content of 2 wt %, the crosslinking DSC peak can be shifted more than 30 °C and a nearly complete crosslinking is already achieved by thermal treatment at 120 °C. The possible origin of the higher catalytic activity of oCB with respect to eGO is discussed.
Highlights
Polymer nanocomposites have attracted a great interest from researchers, due to significant increase of properties obtained with low amounts of nano-dispersed fillers
Many studies have been devoted to nanocomposites with epoxy matrices and graphite nanofillers. Some of these studies have shown a catalytic activity of graphene oxide and of oxidized carbon black on the reaction between the epoxy and amine groups of the resin, leading to higher crosslinking density in milder conditions [12,13,14,15,16,17,18,19,20]
Graphite oxide (GO) and oxidized carbon black were prepared by Hummers' method round-bottomed flask immersed into an ice bath and 5 g of carbon samples were added, with magnetic
Summary
Polymer nanocomposites have attracted a great interest from researchers, due to significant increase of properties obtained with low amounts of nano-dispersed fillers. Many studies have been devoted to nanocomposites with epoxy matrices and graphite nanofillers Some of these studies have shown a catalytic activity of graphene oxide and of oxidized carbon black on the reaction between the epoxy and amine groups of the resin, leading to higher crosslinking density in milder conditions [12,13,14,15,16,17,18,19,20]. Many studies have been devoted to nanocomposites with graphite nanofillers in different kinds of phenolic resins [33,34,35,36,37,38,39,40,41] One of these studies [39] has clearly shown that reduced graphene oxide (r-GO) can enhance mechanical properties and thermal stability of composites. Based on isothermal and non-isothermal scans by Differential Scanning Calorimetry
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