Na Wang

In recent years, core–shell composite particles with organic polymer as the core and inorganic SiO₂ as the shell have attracted widespread attention and prompted robust scientific endeavors. The encapsulation of SiO₂ can endow the polymer core with a variety of important properties, and is of great significance for the synthesis of multi–functional materials, having favorable application prospects in coating, polishing, medical, optical, magnetic, lubrication and other fields. In this paper, the recent advances in the preparation of core–shell polymer@SiO₂ composite particles are reviewed. From the perspective of interface bonding mechanisms between the core and the shell, this paper mainly focused on the following five aspects: Pickering stabilization, acid–base interaction, charge interaction, bridging of coupling agent, hydrogen bonding, and other actions. Additionally, applications of core–shell polymer@SiO₂ particles are also discussed. It is expected that this article can provide scientific guidance for the preparation of polymer@SiO₂ core–shell particles, further enriching their species and broadening their applications.

In this work, the n‐octadecane@TiO₂ particles with core‐shell structure were successfully prepared via a sol‐gel method in an oil‐in‐water (o/w) emulsion. The resultant core‐shell particles were incorporated into epoxy matrix to prepare composites. Compared with pure epoxy and TiO₂ doped epoxy, the incorporation of n‐octadecane@TiO₂ reduced the friction coefficient (COF) and wear rate of epoxy. According to the systematical investigation of the wear tracks on three samples and scars on their friction antithesis balls, it was speculated that the antifriction effect of core‐shell additives on composites were mainly attributed to the mixture formed by the crushed n‐octadecane@TiO₂. The mixture not only backfilled the tearing‐like cracks on worn face generated by fatigue wear, but also promoted the formation of transfer film.