Influence of draining and excluded volume on the intrinsic viscosity of flexible polymers

Effects of stiffness on the flow behavior of polymers

“…19 But preaveraging is still necessary, and this is yet another uncontrolled approximation that at least for certain dynamical properties can introduce errors of as much as 10%-15%. 20 On the other hand, the approximation appears to provide a perfectly consistent description of experiments by Quake et al 21 on the dynamics of partially extended single molecules of DNA undergoing Brownian motion. While these results are suggestive, they do not provide a direct test of the utility of the approximation under conditions of flow.…”

Characterization of the theta state and transition curves of off-lattice three dimensional chains

“…This result can be compared with the value ⌽ EV /⌽ ϭ0.88, obtained by applying renormalization group techniques to a nondraining Gaussian chain, with an approximate description of hydrodynamic interactions. 26 However, the ratio corresponding to the nonextrapolated values of ⌽ for the longer chain, Nϭ151, is ⌽ EV /⌽ ϭ0.86Ϯ0.04, close to the theory. We should remark again that the higher uncertainties inherent to the calculation of intrinsic viscosity values preclude a more precise determination of extrapolated results for infinitely long chains.…”

Draining and long-ranged interactions in the poly(ethylene oxide)/water good solvent system

“…values may be at least partly explained by coil draining.33 34 While extensive excluded volume swelling produced unusually larger A2 values, draining, particularly through the outer portions of PEO coils, resulted in relatively small hydrodynamic radii, and this relatively smaller component of [77] (eq 3) helped produce large values. This explanation may also be used to rationalize what may be considered large values of the ratio p =Rg/Rh = 1.73 found for the PEO/H2O good solvent system.…”