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Interaction Study of Anionic Surfactant with Aqueous Non‐Ionic Polymers from Conductivity, Density and Speed of Sound Measurements
Author(s) -
Chauhan Suvarcha,
Singh Ram,
Sharma Kundan,
Kumar Kuldeep
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-014-1613-2
Subject(s) - chemistry , isentropic process , thermodynamics of micellization , critical micelle concentration , aqueous solution , speed of sound , pulmonary surfactant , polyethylene glycol , enthalpy , standard molar entropy , micelle , molar volume , sodium dodecyl sulfate , polymer , conductivity , molar conductivity , ionic bonding , thermodynamics , analytical chemistry (journal) , standard enthalpy of formation , organic chemistry , ion , biochemistry , physics
In the present study, we have investigated in detail the interactions of the anionic surfactant sodium dodecyl sulfate (SDS) with aqueous polyethylene glycol (PEG), polyvinyl pyrrolidone (PVP) and various PEG + PVP mixtures at 293.15, 303.15 and 313.15 K by applying conductivity, density and speed of sound techniques. From experimentally measured data, the critical micelle concentration (CMC) values, standard free energy of micellization (Δ G m o ), standard enthalpy of micellization (Δ H m o ), standard entropy of micellization (Δ S m o ), isentropic compressibilities ( κ s ), apparent molar volumes ( ϕ v ) and apparent molar isentropic compressions ( ϕ k ) of SDS in aqueous polymer mixtures have been calculated. The nature of the process of micellization has been evidenced from the magnitude of Δ G m o , Δ H m o and Δ S m o values. The trends of variations obtained in the various parameters have been explained in terms of the electrostatic as well as hydrophobic interactions pertaining in SDS−PEG/PVP−water systems.