2025-05-13
Factors affecting viscosity
1.Molecular weight.
Molecular weight is one of the key factors determining the viscosity of CMC. The higher the molecular weight, the higher the viscosity. The reason lies in that a larger molecular weight leads to longer molecular chains, increasing the interaction and entanglement between molecules, and thereby enhancing the viscosity of the solution.
2. Degree of substitution.
When the degree of substitution is low, appropriately increasing the degree of substitution can disrupt the molecular crystalline structure, making the molecular chains easier to dissolve and extend, thereby enhancing the viscosity of the solution. Excessively high substitution will significantly weaken the intermolecular forces, leading to a reduction in chain entanglement, which may instead cause a decrease in viscosity.
3. Solution concentration.
The viscosity of the CMC solution increases significantly with the increase of concentration. However, at extremely high concentrations, due to the repulsion between molecular chains or steric hindrance effect, the viscosity may no longer continue to increase.
4. Temperature.
Generally speaking, an increase in temperature will lead to a decrease in the viscosity of CMC solutions because the thermal motion of molecules intensifies and the intermolecular interactions weaken.
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