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Macromolecule Polymer Molecule Weight Detection
Method of Molecular Weight Detection of Polymers
Fu Ziming The detection of molecular weight of polymers needs to be investigated in detail. Looking at all kinds of means, there is a sedimentation method. The rate of sedimentation of the cover substance in the medium is related to the molecular weight. With a fine instrument, the speed of sedimentation can be measured. After complicated arithmetic, the approximate molecular weight can be obtained.
There is also an osmotic pressure method. The solution and the solvent are separated by a semi-permeable membrane. Due to the different concentrations, the solvent has the potential to penetrate into the solution, and the resulting pressure is osmotic pressure. Osmotic pressure is related to the number of molecules of the solute, from which the molecular weight of the polymer can be inferred. Both of these are common methods for detection, each having its own length and limitations.
The sedimentation method can obtain molecular weight information more intuitively, but it has strict environmental requirements, and the temperature and rheology of the medium are slightly poor, so the result is wrong. Although the osmotic pressure method has high accuracy, the selection and maintenance of semi-permeable membranes is also a difficult matter, and it is only suitable for solutions in a specific concentration range.
Today's technology is new, and the detection method is also advancing with the times. New techniques are introduced frequently, striving for accuracy and convenience, and opening up new avenues for the detection of molecular weight of polymers, so as to promote the vigorous development of this field.
Fu Ziming The detection of molecular weight of polymers needs to be investigated in detail. Looking at all kinds of means, there is a sedimentation method. The rate of sedimentation of the cover substance in the medium is related to the molecular weight. With a fine instrument, the speed of sedimentation can be measured. After complicated arithmetic, the approximate molecular weight can be obtained.
There is also an osmotic pressure method. The solution and the solvent are separated by a semi-permeable membrane. Due to the different concentrations, the solvent has the potential to penetrate into the solution, and the resulting pressure is osmotic pressure. Osmotic pressure is related to the number of molecules of the solute, from which the molecular weight of the polymer can be inferred. Both of these are common methods for detection, each having its own length and limitations.
The sedimentation method can obtain molecular weight information more intuitively, but it has strict environmental requirements, and the temperature and rheology of the medium are slightly poor, so the result is wrong. Although the osmotic pressure method has high accuracy, the selection and maintenance of semi-permeable membranes is also a difficult matter, and it is only suitable for solutions in a specific concentration range.
Today's technology is new, and the detection method is also advancing with the times. New techniques are introduced frequently, striving for accuracy and convenience, and opening up new avenues for the detection of molecular weight of polymers, so as to promote the vigorous development of this field.
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