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Number average molecular weight
The number average molecular weight is a way of determining the molecular weight of a polymer. Polymer molecules, even ones of the same type, come in different sizes (chain lengths, for linear polymers), so the average molecular weight will depend on the method of averaging. The number average molecular weight is the common, mean, average of the molecular weights of the individual polymers. It is determined by measuring the molecular weight of n polymer molecules, summing the weights, and dividing by n .
Additional recommended knowledge
The number average molecular weight of a polymer can be determined by gel permeation chromatography, viscometry (Mark-Houwink equation), and all colligative methods like vapor pressure osmometry or end-group titration.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Number_average_molecular_weight". A list of authors is available in Wikipedia.|