▎ 摘　　要

Homemade graphene based polyurethane composites elaborated using a facile melt mixing method were studied. The polyurethane (PUR) was a hot-melt adhesive and the research was carried out considering the perspective of electrically conductive adhesive composites. The crystallization of PUR was significantly modified by graphene; for instance the crystallization temperature was shifted to higher temperatures. Avrami equation results indicated that the composites constituted nucleated axialites, instead of espherulites. These results were used to explain the initial decrease of conductivity, followed by a recovery, observed during the crystallization process. The observed huge conductivity enhancement, together with the increase of the crystallization temperature, opens interesting perspectives in the development of electrically conductivity adhesives which offer a rapid welding. (C) 2016 Elsevier Ltd. All rights reserved.