Abstract

An interpolymer complex can be prepared as a white precipitate immediately after the mixing of aqueous solutions of poly(oxyethylene) (POE) and poly(acrylic acid) (PAA), or poly(methacrylic acid) (PMAA). Hydrogen bonds between ether oxygens and carboxylic groups in the chain are formed in the complex by cooperative interaction. The ratio of the binding groups to the total of potentially interacting groups (θ), and the stability constant (K) of the polymer-polymer complexes were strongly dependent on chain length, temperature and medium, as well as on enthalpy and entropy changes of the complex formation; hydrophobic interaction was a significant factor for the stabilization of the complexes.

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