Characterizations of natural rubber nanocomposites ﬁlled with organoclay as a substitute for carbon black obtained by melt blending method
The aim of this study was to assess the technical feasibility of natural rubber nanocomposites with Cloisite 20A, a commercial organoclay (OC) to substitute for conventionally used carbon black as a ﬁller. Three Rubber clay nanocomposites (RCN) were prepared while varying the content of OC (2, 4 and 8 phr - parts per hundred of rubber). For comparative purposes, a sample with 40 phr of carbon black was also prepared and analyzed. The compounds were characterized by their rheological, morphological, thermal and mechanical properties. The results revealed the intercalation of the OC by the rubber chains in the RCN, which reduced the enthalpy and onset curing temperature of the curing process. The XRD data indicated that the OC was more uniformly dispersed in the RCN. The results for the mechanical properties indicated that 40 phr carbon black can be no longer be fully replaced by OC without affecting the properties of the ﬁnal material.