2. Fractionation of macromolecular samples
Establishing the distribution curve of a polymer sample involves separating the sample into fractions that are as polymolecular as possible. Fractionation techniques are based either on differences in the solubility of the sample's constituent species, or more simply on differences in the molecular dimensions of these species.
2.1 Fractionation based on solubility differences
When a homogeneous polymer solution is separated into two phases, the thermodynamic equilibrium conditions of these phases show that the higher the degree of polymerization DP i , the greater the quantity of species i precipitated. Macromolecules can therefore be separated according to their mass by demixing a homogeneous solution of a polymolecular...
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Fractionation of macromolecular samples
Determination of average molar masses
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