An investigation was made of the influence of the composition and structure of n-butyl ethers of nitrogen-containing phenol formaldehyde oligomers on their dynamic viscosity. The dependence of shear rate on shear stress was studied for oligomeric compositions that had previously been tested successfully as film-forming materials. The dependence of dynamic viscosity (and flow) on shear stress was investigated for oligomers of different composition. Explanations and conclusions are given.
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