Polymer charge density, effect

Polymer Charge Density. The effect of polymer charge density is illustrated in detail in Figure 7. For reference purposes, values obtained in the absence of the polymer are 0.4 mm/s, 38%,... 

Figure 7. Diagram illustrating the effect of polymer charge density on various flocculation responses of Na-kaolinite at pH 4.5.

Existing theories of the adsorption of polyelectrolyte allow effects of the polymer charge density, the surface charge density, and the ionic strength on the adsorption behavior to be predicted. The predicted adsorption behavior resembles that of nonionic polymers if the ionic strength is high or the polymer charge density is very low. 

Ray J, Manning GS. Effect of counterion valence and polymer charge density on the pair potential of two polyions. Macromolecules 1997 30 5739-5744. 

Figure 3 illustrates the electro-optical effect dependence on the polymer charge density for a suspension of /3-FeOOH particles, stabilized by the adsorption of polyacrylamides with degrees of hydrolysis 3.4, 9.8, and 19.1%, respectively. The calculated electric polarizabilities y at plateau value of the corresponding adsorbed polyacrylamide T are presented in Table 1. They are of an order that is typical for all other systems described in this review—10 2S-10 32 Fm2. Values of the electric polarizability between 10 28 and 10 32 Fm2 have also been obtained for most of the polyelectrolytes investigated in solution [1,49,50]. 

Mattison K. W., Dubin P. L., Brittain I. J. complex formation between bovine serum albumin and strong poly electrolytes effect of polymer charge density. J. Phys. Chem. B 1998 102 3830-3836. 

Kogej K, Skerjanc J. Binding of cetylpyridinium cation by poly(acrylic acid). Effect of polymer charge density. Acta Chim Slov 1999 46 269-279. 

Dou, S., and Colby, R. H., Charge density effects in salt-free polyelectrolyte solutions, J. Polym. Sci. Polym. Phys., 44, 2001-2013 (2006). 

Table I. Cationic celluloslc polymers investigated for molecular weight and charge density effects.

While the experiments just described address the effects of polymer charge density and molecular weight on polymer-phospholipid interactions, our work on polyanions concerns a third structured variable chain microstructure. 

All of the states of protein-polyelectrolyte complexes referred to above may be achieved by the selection of the polyelectrolyte (PE), choice of ionic strength and pH, and control of the concentration of the macromolecular components. Most reports on the practical applications of protein-polyelectrolyte complexes concern the effects of these factors. This chapter focuses on the effects of polymer charge density, solution pH and ionic strength on protein-polyelectrolyte com-plexation discussed in recent and current research. Techniques employed in the study of protein-polyelectrolyte complexes and applications of the complex to protein separation and enzyme immobilization are also described. 

J. Ray and G. S. Manning, Macromolecules, 30, 5739 (1997). Effect of Counterion Valence and Polymer Charge Density on the Pair Potential of Two Polyions. 

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