Abstract
In this work: (i) magnetic nanoparticles of Fe3O4 are synthesized via precipitation method, functionalized with β-cyclodextrin hydroxyl-rich precursor, and characterized by FTIR, TEM and magnetic hysteresis loop techniques; (ii) epoxy nanocomposites containing bare and β-cyclodextrin-modified Fe3O4 nanoparticles are prepared, and their cure behavior/kinetics has been studied by isoconversional models applied on dynamic DSC data; (iii) adhesion energy between cure moieties and surface of β-cyclodextrin is quantified using molecular dynamics simulation. Activation energy of epoxy resin increased from 56 to 62 kJ/mol upon introduction of β-cyclodextrin-modified Fe3O4 to the epoxy, which suggests retarded crosslinking compared to the blank system, while a highly cured network was identified for the resin containing β-cyclodextrin-modified Fe3O4 particles due to additional chemical reaction of hydroxyl functional groups attached to Fe3O4 surface with cure moieties. Molecular dynamics simulation confirmed either quantitatively or qualitatively the strong adhesion between cure moieties and β-cyclodextrin surface.
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