Gyration, radius apparent mean square

Fig-1- Variation of the apparent mean-square radius of gyration app (solid lines) and the apparent reciprocal hydrodynamic radius app (dotted lines) as a function of the solvent refractive index ns and refractive index increment dn/dc for a heterogeneous star mol ecule (AB)f with f= 18 block B, polyisoprene, M=230 000 block A, polystyrene, M=150 000... 

This equation shows that the apparent mean square radius of gyration of a copolymer when plotted as a function of Y (i.e. measured in solvent of different scattering length draisity), should have a parabolic shape with downward curvature. lonescu et al. showed that this curve should be little altered in the presence of excluded volume, they also demonstrated that the curve can become severely distorted if the copolymers are polydispo-sed in molecular weight. Figure 19 shows the schematic variation in... 

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