Sedimentation coefficient poly

Figure 3. Concentration of poly(l-amidoethylene) in a centrifuged sample plotted as a function of sedimentation coefficient.

Fig. 3.29 Dependence of (a) apparent molecular weight, (b) sedimentation coefficient and (c) intrinsic viscosity fi/, and Huggins coefficient, ktl. on solvent composition (methanol-water-0.1 M LiBr mixtures) for solutions of a PS-poly(4-vinyl-A -ethylpyri-dinium bromide) = 32.7kgmol l, 8% PS) diblock (Selb and Gallot 1981a).

Estimate the limiting diffusion coefficient, the limiting sedimentation coefficient and the radius of gyration of poly(methyl methacrylate) (M = 2.5 x 105) in toluene. 

Fig. 4. Sedimentation coefficient (s) vs. molecular weight M - for ladder polysiloxanes 1 poly-phenylsiloxane in benzene ) 2 poly(phenyl-isohexylsiloxane) (1 1) in butyl acetate ...

Fig. 6, Sedimentation coefficient (sj vs. molecular weight M - in tetrachloro-methane 1 poly(butyl isocyanate) 2 poly(chlorohexyl isocyanate) ). Broken lines intersecting the abscissa correspond to the main chain length L= 2.27...

Table 1. Sedimentation coefficient of poly(ADP-ribosyl)ated chromatin samples...

To illustrate the scaling law, sedimentation coefficients were determined for poly (ethylene oxide) (molecular weight 3 x 10 ) in aqueous solution as a function of the concentration. Data are as follows ... 

Fig. 2.5 Effect of mastication by Brabender plastograph on the MWD of bimodal c/>poly-butadiene (1) original (2) 4 min, hot (3) 20 min, hot (4) 25 min, cold (roll mill). Distributions are from sedimentation coefficients obtained by ultracentrifugation [13].

Figure 9.8 Dp from QELSS (O) and inferred (0) from the friction factor for the sedimentation coefficient of (a) 80, and (b) 40 nm PSL in solutions of 90 kDa poly-L-lysine, after Nehme, et fl/.(14).

Examples of the relationship between the observed sedimentation coefficient and the polyion concentration are shown in Figure 1. The limiting sedimentation coefficient, ( Sp)y, is observed to depend upon the ionic strength. These differences in (S X are to be expected because of the expansion of the poly ion coil as the ionic strength is decreased, and also because the ionic atmosphere influences the motion of the polyion. 

In general, the diffusion coefficient of an electrolyte is a function of concentration. One of the reasons for the concentration dependence of diffusion coefficient is the electrolyte effect of ionic atmosphere around each ion. A similar effect of ionic atmosphere should be observed for diffusion and sedimentation coefficients of a poly electrolyte. Moreover, the effect of ionic atmosphere should remain even at the limit of infinite dilution of polyelectrolyte if the concentration of added neutral salt is kept constant, since the ionic atmosphere does not disappear. 

The sedimentation and diffusion coefficients for three different preparations of poly(methyl methacrylate) were measuredf in /i-butyl chloride at 35.6 C (= 0) and in acetone at 20 C (> 0) and the following results were obtained ... 

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