Point-surface structured modified graphene oxide-based rubber composites with simultaneous enhanced mechanical properties, low heat build-up and thermal conductivity

Graphene oxide (GO) has been widely applied in the rubber industry due to its excellent insulating and physical properties. However, its dispersion has always been a key factor limiting the enhancement of overall rubber performance. In this study, tetrapropoxysilane (TPOS) was used to modify GO, creating a point-surface structure. This process resulted in SiO2@GO, which was subsequently employed as reinforcing fillers for the preparation of rubber composites. The results indicated that the point-surface structure of SiO2@GO fillers increased the spacing between GO layers and the effective contact area with the rubber matrix, endowing it with excellent dispersion. Compared to GO/natural rubber (NR) composites, SiO2@GO/NR composites exhibited reduced heat generation while demonstrating enhanced mechanical properties and thermal conductivity with a filler content of only 0.5 phr. Specifically, the heat generation value, thermal conductivity, tensile strength, and tear strength were 20.7 degrees C, 0.28 W/m K-1, 28.14 MPa, and 108.43 N/mm, respectively. This method provided new insights into the preparation of GO-based long-lasting green tires.