Radius of gyration measuring

Figure 3. Partition coefficient of freely jointed chains between the bulk solution and a cylindrical pore. The chains have different numbers of mass-points (n) and different bond lengths, and are characterized by the root-mean-square radius of gyration measured in units of the pore radius. See text for details.

The alternative and, in our view, more probable explanation of the high value of Rg for polystyrene lies in the nature of the molecular weight distribution of the polymers. The radius of gyration measured by light scattering is a z-average quantity and is higher for a polymer of broad... 

Experimental Assessment, The most direct experimental assessment of the persistence length may be obtained from the root-mean-square radius of gyration measured by light scattering. The analytical expression for the unperturbed Rq of a. wormlike chain has been given by Benoit and Doty (5) ... 

Styrene-Methacrylic Acid Copolymers and Their Salts. Two different types of experiments were performed with these copolymers. A possible clustering of the ionic groups was studied with copolymers containing protonated styrene monomers and deuterated methacrylic acid groups. The radius of gyration measurements were studied from mixtures of all deuterated chains in a protonated matrix. 

There is a systematic error in the radius of gyration measurement because high molecular weight samples (mol wt 4 to 5 X 105) were used, and the extrapolation was done in a domain where qR is slightly larger than one. In spite of this limitation, the qR values are similar to the values obtained for polystyrene samples of similar molecular weight. 

The Z average square radius of gyration measured by scattering [see (15.1.11)] is written as... 

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