Catalytic Activity of Oxidized Carbon Black and Graphene Oxide for the Crosslinking of Epoxy Resins

• Main Authors: Maria Rosaria Acocella, Carola Esposito Corcione, Antonella Giuri, Mario Maggio, Gaetano Guerra, Alfonso Maffezzoli
• Format: Article
• Language: English
• Published: MDPI AG 2017-04-01
• Series: Polymers
• Subjects: carbon black oxidation; Differential Scanning Calorimetry; gel time
• Online Access: http://www.mdpi.com/2073-4360/9/4/133

This article compares the catalytic activities of oxidized carbon black (oCB) and graphene oxide (eGO) samples on the kinetics of a reaction of diglycidyl ether of bisphenol A (DGEBA) with a diamine, leading to crosslinked insoluble networks. The study is mainly conducted by rheometry and Differential Scanning Calorimetry (DSC). Following the same oxidation procedure, CB samples are more efficiently oxidized than graphite samples. For instance, CB and graphite samples with high specific surface areas (151 and 308 m2/g), as oxidized by the Hummers’ method, exhibit O/C wt/wt ratios of 0.91 and 0.62, respectively. Due to the higher oxidation levels, these oCB samples exhibit a higher catalytic activity toward the curing of epoxy resins than fully exfoliated graphene oxide.