Bicontinuous laminated structure design of polypropylene/reduced graphene oxide hybrid films for thermal management

As modern electronic equipment is gradually miniaturized and functionalized, highly thermally conductive composites have been attracted much attention. The polypropylene/partially reduced graphene oxide (PP/rGO) hybrid films with bicontinuous laminated structure were prepared by a facile method. The in-plane thermal conductivity (TC) of PP hybrid film is as high as 12.75 W·m−1·K−1, which is better than most reported values (< 10 W·m−1·K−1). The good thermal conductivity is due to alternate multi-layered structure, rGO’s alignment, and effective interface interaction between layers. The influence of rGO layers’ number and thickness on thermal conductivity and mechanical properties of hybrid films was investigated systematically. Combined with good flexibility and passable mechanical properties, it has a bright future in practical application.Graphical abstractThe flexible PP/rGO films with bicontinuous laminated structure exhibit excellent thermal conductivity and good mechanical properties.