Usually intrinsic viscosity is more related with molecular weight. we can calculate viscosity average molecular weight from IV. BUT intrinsic viscosity of a polymer is very different from "viscosity".
Here is the detail information of relation between viscosity and molecular weight
The intrinsic viscosity is a reflection of the size of a polymer molecule in solution. It is measured by precisely measuring the effect a polymer sample has on the viscosity of a solvent. The exact definition is the zero concentration value of 1/c * ln (viscosity of polymer solution/viscosity of the solvent). It is most accurately and easily determined using a forced flow relative viscometer, and very dilute (ca 0.1% wt/vol or less) solutions of the polymer of interest. The units are usually dl/g (deciliters per gram).
so, how can the molecular weight of a polymer for example poly-(ethylene oxide, Mv= 400,000) be calculated from its viscosity average molecular weight?
The viscosity average molecular weight can be calculated using the Mark Houinck relationship.
Needless to say, since typical polymers are mixtures of molecules of different sizes (from different degrees of polymerization), there are a range of sizes, and this range can be quantitatively described using the distribution concept, typically plotted as N vs M, where N is the relative number of molecules and M is the molecular mass.
The value obtained is an average for the distribution of sizes and molecular weights in the particular sample. If one assumes a particular distribution shape for a sample, the various moments of the distribution function can be calculated. (The first moment is called the number average molecular weight, the second moment is called the weight average molecular weight, the third moment is called the Z average molecular weight, and the fourth moment is called the Z+1, and so on.)
The various moments of the distribution generally correlate with mechanical properties of different time scales.
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