Submitted to: American Chemical Society National Meeting
Publication Type: Proceedings
Publication Acceptance Date: August 20, 2007
Publication Date: August 20, 2007
Citation: Jong, L., Byars, J.A. 2007. Flow properties of natural rubber composites filled with defatted soy flour. Proceedings of American Chemical Society National Meeting. Paper No. PMSE 280. Technical Abstract: Previously, defatted soy flour (DSF) in a styrene-butadiene matrix has been shown to have a significant reinforcement effect. In this study, the objective is to investigate the flow properties of composites in natural rubber to understand their processing characteristics. Composites with 10 to 30 wt% DSF and carbon black (CB) were prepared by freeze drying and compression molding. A capillary rheometer was used to measure the viscosity of the composites at temperatures from 90 deg C to 150 deg C and at shear rates from 5 to 1000 s-1. Both rubber and composites are non-Newtonian pseudoplastic fluids, and CB filled composites had higher viscosities than DSF composites. The viscosity of a 30% DSF filled composite is less temperature dependent than that of natural rubber matrix. Dynamic mechanical measurements also showed a reinforcement effect for both composites, with greater reinforcement for CB at a given concentration.