Theory for Linear Molecules with Experiment

Comparison of Theory for Linear Molecules with Experiment 

To compare experimental data with the predictions of equations 15,16, and 26, it is necessary to have a linear polymer with narrow molecular weight distribution and to extrapolate data at each frequency of measurement to infinite dilution. For [G ], the right side of equation 2 plotted against c gives a satisfactory linear plot 

Characteristic Parameters Predicted by Bead-Spring Model Theories 

The first comparisons of data extrapolated to infinite dilution with molecular theory were made by Tanaka, Sakanishi, Kaneko, and Furuichi. Rather good agreement with the Zimm theory was obtained, especially in 8-solvents, but with a relatively narrow frequency range. A wider range has been covered more recently with the Birnboim-Schrag multiple-lumped resonator.  

A similar plot is shown in Fig. 9-12 for the same polystyrene in two good solvents whose thermodynamic interaction with the polymer is about the same as evidenced by nearly equal intrinsic viscosities, but whose different solvent viscosities again extend the effective frequency range. The fit is good with N large, h = 0.15, corresponding to intermediate hydrodynamic interaction (Section 3). 

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