Effect of ionic strength of the solution of some hydrogen-bonded interpolymer complexes on the stability and thermodynamic parameters Summary-The effect of ionic strength of the solution on the complex formation of poly(acrylic acid) (PAA) with poly(vinyl pyrrolidone) (PVP) has been studied in aqueous solutions containing various inorganic salts (NaCl, KCl, NH 4 Cl). Stability constant (K s), degree of linkage (θ) and related thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0) have been compared for different complexation systems. The comparative study indicated considerable difference in the values of these parameters, which has been explained on the basis of relative strength of H-bond present in different systems.