The self-healing properties of rubber products can be given by the introduction of dynamic crosslinking bonds. In this work

carboxylated cellulose nanocrystals (CCA) and zinc oxide (ZnO) were selected as fillers. Carboxylated styrene-butadiene rubber (XSBR) composites (X/C/Z) with dual dynamic crosslinking networks were constructed by constructing ionic bonds between Zn2+ of ZnO and the carboxyl groups of XSBR and CCA

as well as hydrogen bonds between the carboxyl groups of CCA and XSBR. The FTIR results confirmed the existence of dual dynamic crosslinking networks in X/C/Z composites. Compared with XSBR/CCA and XSBR/ZnO composites

the dual dynamic crosslinking networks and the synergistic reinforcement of CCA and ZnO endow X/C/Z composites with more excellent physical and mechanical properties. Fixed the CCA content at 5 wt%

the crosslinking density of X/C/Z composites increased with the increase of ZnO content. The tensile strength of the composites also showed an increasing trend

while the elongation at break gradually decreased. Meanwhile

the increase of ZnO content provided more Zn2+ that can complex with the carboxyl groups of XSBR and CCA to form ionic bonds. As a result

the self-healing ability of the composites were enhanced greatly. In this paper

using ZnO and CCA as reinforcing/cross-linking fillers

carboxylated styrene-butadiene rubber self-healing composites with excellent properties were prepared by a simple and convenient method

which provided a way for the development of self-healing composites.