Most of the water-based rubber latexes show the behavior of non-Newtonian fluid while solvent-based rubber latexes behave as Newtonian fluid. It creates difficulties in latex glove dipping industries due to viscosity variation of rubber latex compounds such as neoprene rubber, nitrile butadiene rubber, etc. Is there any way to control and measure the viscosity of non-Newtonian rubber latexes.
In Newtonian fluids, this value doesn't change, but with non-Newtonian fluids, apparent viscosity is directly affected by the shear rate. It can be calculated by dividing shear stress by shear rate. Relative viscosity: Relative viscosity is important for non-Newtonian fluids, specifically polymers. The apparent viscosity largely changes with the shear rate. This because the shape and rotation speed of the mixing impeller in a mixing vessel determine the shear rate. To understand why this is, one must look at the microscopic level at the differences in how molecules are arranged depending upon the flow. Processes with non-Newtonian fluids passing through a pump, a filter, instruments with a smaller diameter than the pipe size, or those flowing through a sampling valve may be significantly affected. The requirement to have the precise flow conditions in effect during measurement of viscosity is why the use of an in-line viscosity measurement device for measuring non-Newtonian fluids is so useful in process quality control.
https://link.springer.com/article/10.1007/BF03185177
You can do rheological study with a rotational rheometer. I am not an expert in latexes (I am a melt rheology guy), but it looks like they are structured fluids and therefore you could see some interesting phenomena like thixotropy for example.
Hi Olivier Catherine Thanks, but I couldn't get even using brookfield dial viscometer which is a rotational rheometer to measure the dynamic viscosity.
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