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The properties of polymers are largely dependent on their size, molecular mass and structure. There are different methods to find out the molecular mass of polymers.
Molecular Weight Distribution (also known as Molar Mass Distribution) explains the relationship between the number of moles of each polymer species and molar mass of that species.
Dispersity describes the variation in the size of the molecules or particles in a mixture. Like that Polydispersity Index refers to non-uniformity in the size of the molecules or particles in a mixture. Its value ranges from 0 to 1. A good polydispersity index is that material whole value lies between 0 and 1. It measures the distribution of molecular mass in each polymer sample.
It is defined as the statistical average molecular weight of all the polymer chains that are present in a polymer sample.
Mi is the molecular weight of a chain. Ni is the number of chains.
It is the average of the molecular mass of the individual polymers.
The unit of molecular weight of polymer is either kg/mol or g/mol.
Z average molecular weight or Z average molar mass is the third power average molar mass. It is given by the formula:
Here, Mz represents the Z average molecular weight. Mi is the molecular weight of a chain. Ni is the number of chains.
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