SUMM A F~We present potentiometric and viscometric results on the interpolymer complexation between polyacrylamide (PAAM) and poly(N-isopropylacrylamide) (PNIPAAM) with poly(acry1ic acid) (PAA) in dilute aqueous solution. A potentiometric procedure for the determination of the complex stoichiometry in monomeric units has been proposed. The temperature dependence of the strength of the complexes formed has been investigated. From the results obtained it has been concluded that hydrogen bonding is the main factor stabilizing the PAAMRAA complex, strengthened by decreasing the temperature while the much stronger PNIPAAMPAA complex, strengthened by increasing the temperature, is stabilized by hydrophobic interaction.

The interpolymer complexation, through successive hydrogen bonding, between poly(acrylamide) (PAAm) and poly(N‐isopropylacrylamide) (PNiPAAm) with poly(acrylic acid) (PAA) in aqueous solution has been viscometrically and potentiometrically investigated. The stoichiometry of the complexes formed was determined. By comparing the strength of the two complexes the very important contribution of the hydrophobic interaction in their formation has been indicated.

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