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As for R
G
data a model must be introduced, in this case for the intrinsic
viscosity. Such models have been developed, and are based on fitting the
following parameters to the data:
•
M
L
: mass per unit length. Can be obtained from the chemistry as
described in Section 2.3.3. (xanthan as example)
•
Persistence length
The analytical expressions are more complicated than for R
G
and less suited
for simple worksheets and will not be discussed further here. However, a
popular simplification (Bohdanecky model) is described in Section 6.2.6.