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.

No abstract

Qualitative analysis for stability of some hydrogen bonded interpolymer complexes of poly (acrylic acid) with non ionic polymers such as poly (methacryl amide) (PMAm), poly (vinyl pyrrolidon) (PVP), poly (ethylene oxide) (PEO) and poly (ethylene glycol) (PEG), has been done by determining the stability constant (K) and thermodynamic parameters (e.g. ΔH⁰ and ΔS⁰) of these complexes at several temperatures. The comparative studies indicate considerable difference in the values of these parameters. They can be explained on the basis of influence of other interacting forces such as hydrophobic and ion dipole interactions during interpolymer complex formation. It has been found that the stability of H-bonding interpolymer complex is greatly enhanced by these two factors.

The effect of composition on stability constant and related thermodynamic parameters (e.g., DH 0 and DS 0 ) have been determined for some multicomponent intermacromolecular complexes of varying composition involving poly(acrylic acid), poly(vinyl pyrrolidone) and poly(ethylene imine). The enthalpy and entropy changes of the systems with temperature have been interpreted in terms of destabilization of the various interacting forces involved in complex formation.

No abstract