Some Characteristics of Numerical Results

Intrinsic Viscosity. The intrinsic viscosity is the most important viscoelastic quantity in the longest relaxation time t0i of Eq. (1.21). The factor M rjJJl T is determinal if the equilibrium properties of the solution and the viscosity of the solvent is given. The quantity Sj seems 

It is customary to write M for linear polymers in 0-solvents in the form 

The intrinsic viscosity of linear polymers in good solvents may be written as 

The intrinsic viscosity of branched polymers is conveniently described by the ratio 

It has been reported that observed values of cj for symmetrical star polymers in 0-solvents are approximately equal to g112 if / is not very large (62-64) but otherwise are smaller than g112 (65). However, smaller values are also reported even for small number of branches (66). Although Eq. (2.39b) was obtained for star polymers, it is expected to be applicable to other types of branches to some extent. However, the result of its application to comb polymers is not very encouraging (64,67). The effect of the excluded volume has not been studied so much theoretically. Recent experimental results by Kamada and Sato (65) and by Kurata et al. (69,70) revealed that (f is approximately equal to g1/2 for randomly branched polymers in good solvents. 

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