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Mixtures of polymers and surfactants are commonly found in a range of   products of pharmaceutical, cosmetic, and food industry. Interaction between   polymers and surfactants influences different properties of these products,   e.g. stability, flow properties, phase behavior, etc. It is known from   previous work that an interaction in binary mixtures of hydroxypropylmethyl   cellulose (HPMC) and sodium dodecylsulfate (SDS) takes place when SDS   concentration (CSDS.) is higher than the critical association concentration   (CAC) and lower than the polymer saturation point (PSP). The interaction   results in the formation of an HPMC-SDS complex. The objective of this work   was to study the effect of the ionic strength on the HPMC-SDS complex   formation by rheological investigation. The HPMC/SDS mixtures composed of   0.70 % wt. HPMC, and 0.00 % to 2.50 % wt. SDS were prepared in deionized   water, 0.01M and 0.05M NaCl solution. It was found that an increase in the   ionic strength influences the HPMC-SDS complex formation by increasing the   zero shear viscosity of the mixtures in the interaction region   (CAC<CSDS<PSP), while a decrease in the viscosity is observed for CSDS>PSP.   The HPMC/SDS mixtures showed a shear thinning or a shear thickening flow   properties depending on CSDS. The flow properties were influenced by the   ionic strength of the mixtures.[Projekat Ministarstva nauke Republike Srbije,   br. III46010

Influence of ionic strength on the rheological properties of hydroxypropylmethyl cellulose-sodium dodecylsulfate mixtures