In the present work, a comparative study of the mechanical behavior of two series of elastomeric composites, based on carboxylated styrene butadiene rubber (X-SBR) and reinforced with rice bran carbon (RBC) and graphite, is reported. Hybrid composites of X-SBR filled with RBC-graphite were also investigated in terms of the cure characteristics, hardness, tensile properties, abrasion resistance, and swelling. It was observed that the cure times decreased with the incorporation of a carbon filler whereas the torque difference, tensile strength, tensile modulus, hardness, and swelling resistance increased compared to the neat X-SBR revealing a favorable characteristic of crosslinking. Dynamic rheological analysis showed that the G' values of the composites, upon the addition of RBC-graphite, were changed to some extent. This demonstrates that the presence of a strongly developed network of fillers will ensure a reinforcing characteristic in a polymer matrix.

Abstract
 1. Introduction
 2. Experimental
  2.1. Materials
  2.2. Preparation of the X-SBR composites
  2.3. Characterization
 3. Results and Discussion
  3.1. ATR-FTIR analysis
  3.2. Fracture surfaces of the X-SBR composites
  3.3. Vulcanization characteristics
  3.4. Mechanical properties
  3.5. Dynamic rheological properties of the XSBRcompounds
  3.6. Abrasion resistance
  3.7. Thermal properties of the X-SBR composites
  3.8. Swelling Properties of the X-SBR composites
 4. Conclusions
 References

• Yuan Fan(School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
• Qingyuan Li(School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
• Xiangxu Li(School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
• Dam hee Lee(School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
• Ur Ryong Cho(School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Research Center of Eco-friendly & High-performance Chemical Materials) Corresponding Author