Polymer Grafting onto Carbon Black by Solid State Method

Abstract

To modify carbon black (CB) surface, the in situ grafting of natural rubber (NR) onto the CB surface by solid state method was investigated. The torque value of CB/NR blend system in Haake internal mixer and FT IR spectra of grafted carbon black (GCB) illuminated that the grafting reaction took place and the decomposed NR was grafted onto the CB surface. From the TGA results the grafting percentage of NR onto CB was determined to be from 7.3% to 44.0%. The Orthogonal design (ORD), which was used to investigate which process parameter significantly influenced the grafting reaction, showed that the degradation time of NR and mixing temperature played an important role in the grafting process. Based on above results, it was considered that the grafting mechanism is radical reaction of the active radical of CB formed by shear force and polymer radical formed by NR decomposition. In addition, the mechanical properties of vulcanized NR filled with GCB were enhanced to a large extent compared with CB system.