Abstract
Herein, the conductivity measurement technique is used to determine the interactions that may occur between polyvinyl pyrrolidone (PVP) polymer and cetylpyridinium chloride (CPC) surfactant in the presence of NaCl and Na2SO4 of fixed concentration at variable temperatures (298.15–323.15 K) with an interval of 5 K. In the absence or presence of salts, we observed three critical micelle concentrations (CMC) for the CPC + PVP mixture. In all situations, CMC1 values of CPC + PVP system were found to be higher in water than in attendance of salts (NaCl and Na2SO4). Temperature and additives have the tendency to affect counterion binding values. Various physico-chemical parameters were analyzed and demonstrated smoothly, including free energy (ΔG0m), enthalpy (ΔH0m) and entropy change (ΔS0m). The micellization process is achieved to be spontaneous based on the obtained negative ΔG0m values. The linearity of the and values is excellent. The intrinsic enthalpy gain (ΔH0*m) and compensation temperature (Tc) were calculated and discussed with logical points. Interactions of polymer hydrophobic chains or the polymer + surfactant associated with amphiphilic surface-active drugs can employ a strong impact on the behavior of the gels.
Highlights
Surfactants are substances that can reduce the surface tension of a solvent
For the aggregation of cetylpyridinium chloride (CPC) + polyvinyl pyrrolidone (PVP) mixture in H2O + NaCl medium, the CMC2 values suffer a fall with the rise of temperature while the CMC1 and CMC3 values primarily experience a reduction with the increase in temperature, reach the least value, and experience an increase with the gradual intensification of temperature
The conductivities of PVP + CPC mixed systems were measured in H2O/H2O + NaCl/H2O + Na2SO4 solutions at various temperatures to insight into the interaction between PVP and CPC
Summary
Surfactants are substances that can reduce the surface tension of a solvent. Aggregation behavior of amphiphilic substances, which is basically a non-covalent interaction, is a normal and spontaneous phenomenon [1]. Due to the greatest role of these two sodium salts to our body, we have selected these salts In this current work conductivity technique has been used to examine the interaction between the chosen surfactant (CPC) and polymer (PVP) with/without presence of salts (NaCl and Na2SO4). They obtained a decreasing trend of CMC in the manifestation of these salts They described that, NaCl could not interact with PEO, the counter ions of surfactant interact with micelles and macromolecules, which allows the increase in the surfactant’s chemical the potential, and the effect of NaCl results in the reduction in both CAC and CMC values. Akhlaghi and Riahi [44] reported the effect of different salts on the CMC of TX-100, and they obtained greater effect of NaCl in reducing CMC in comparison to Na2SO4
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