Salinity polymer properties affected

Interfacial Tension. Another property of the polymer is the ability to bind up water. Depending on the nature of the polymer, charged or neutral, the hydrodynamic volume or the electrical double layer will be affected by both salinity and temperature. Usually it will decrease as salinity and temperature increase. Kalpakci et al. [J3] suggested that a dissociative surfactant-polymer interaction would have synergistic effects... 

The effect of ionic strength on the adsorption of protein onto poly[NIPAM] is more complex than was expected. In fact, salinity affects not only electrostatic interactions but also the colloidal properties of such thermally sensitive particles (1) the increase in ionic strength leads to a reduction in particle size induced by lowering the volume phase transition temperature (i.e., the LCST of linear thermally sensitive polymer decreases as the salinity of the medium increases) and (2) salinity affects the degree of attractive and repulsive electrostatic interactions. As a result, the adsorption of proteins onto thermally sensitive microgel particles is generally and dramatically reduced as salinity increases, irrespective of temperature (as illustrated for P24 [Figure 9.26] adsorption onto poly(NIPAM) particles). 

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