Surface modification of rice husk–based carbon–silica dual‐phase filler by ethanol‐assisted milling and its reinforcing on natural rubber

Silica carbon black (SiCB) was used as a natural carbon–silica dual‐phase filler (CSDPF) containing both biochar and silica, which was obtained by pyrolysis of rice husks. The reinforcing performances of SiCB were limited by the large particle size and poor surface activity. In this work, the size and distribution of the SiCB particles were modified by ethanol‐assisted milling (S/E), and increase in oxygen‐containing groups enhanced the surface...