%0 Journal Article
%T Rheological studies of functional polyurethane composite:  Part 1. Rheology of polyurethane composite, its compounds with and without solid additives (aluminum flakes)
%A James L Smith
%A Jimmie C Oxley
%A Philipp M Baldovi
%A Sayavur I Bakhtiyarov
%J Journal of Elastomers & Plastics
%@ 1530-8006
%D 2018
%R 10.1177/0095244317715787
%X The rheological dynamic characteristics of the functional Polyurethane composite as well as its compounds (triethanolamine (TEOA) and toluene-2,4-diisocyanate (TDI)) with and without solid additives (aluminum flakes) were experimentally measured using a computer-controlled mechanical spectrometer (rheometer) ARES-G2. Rheological studies showed that both components behave as viscous Newtonian fluids. TEOA exhibits a strong temperature-thickening behavior. TEOA with aluminum flake additives behaves as a viscous Newtonian fluid. The effective viscosity of the two-phase mixture increases with the concentration of the aluminum additive and decreases with the temperature rise. The rheometric tests showed that the effective viscosity of the TDI/Al mixture increases with the aluminum content. The mixture exhibits thermal-thickening and shear-thinning behaviors with the yield stress. The system can be described with the Bingham plastic model. It is determined that TEOA/TDI composite exhibits a strong time-thickening and shear-thinning behaviors. The rheological behavior of this composite can be described with the power-law generalized non-Newtonian fluid model. The effective viscosity of TEOA/TDI/Al composite increases with both the testing time (exponentially) and the aluminum content (polynomial) in the mixture. However, these shear-thinning composites obey the power-law generalized non-Newtonian fluid model, and their flow curves can be described by the logarithmic law
%K Polyurethane composite
%K viscosity
%K functional composite
%K aluminum
%U https://journals.sagepub.com/doi/full/10.1177/0095244317715787