No abstract

Complex formation in the model three‐component system, including polymer‐polymer complex of poly(styrene‐alt‐maleic acid) (PSMA) and poly(ethylene oxide) (PEO), and also silica sol (SiO2) in aqueous solution as a function of molecular weight of PEO and the order of component mixing, were investigated. The degree of binding of PSMA links with PEO and SiO2 as well as the Gibbs energy of formation of the polymer‐polymer complex and polymer‐colloid complexes were defined. It was shown that the main factor of stabilization of the structure is hydrogen bonds. The conditions of three‐component polymer‐colloid system are practically independent of the order of component mixing. The spontaneous formation of polymer‐colloid complexes between chemically complementary polymers and small dispersed particles is considered as the main reason for the abnormally high binding ability of colloid particles to the polymer‐polymer complex.

No abstract

Organic chemistry Z 0200 Graft Copolymers with Chemically Complementary Components as a Special Class of High-Molecular-Weight Compounds-[204 refs.]. -(ZHELTONOZHSKAYA, T. B.; ZAGDANSKAYA, N. E.; DEMCHENKO, O. V.; MOMOT, L. N.; PERMYAKOVA, N. M.; SYROMYATNIKOV, V. G.; KUNITSKAYA, L. R.; Russ. Chem. Rev. (Engl. Transl.) 73 (2004) 8, 811-829; Dep. Chem., Taras Shevchenko Univ., Kiev 252033, Ukraine; Eng.) -Lindner 05-255

The phenomenon of self‐assembly of aggregates formed by relatively short chains of poly(vinyl alcohol) (PVA) on the long macromolecules of polyacrylamide (PAA) in aqueous medium are discussed. PVA and PAA form intermolecular polycomplexes (InterPC) of a constant composition independently on a ratio of polymer components. The complex formation between high‐molecular‐weight PAA and relatively low‐molecular‐weight poly(ethylene oxide) (PEO) are considered also. PEO with M ⩽ 4·104 g.mol−1 weakly interacts with PAA. The polymer‐polymer interaction can be intensified when the part of amide groups (∼20 mol %) on PAA chain to transform into the carboxylic groups. InterPCs formed by PEO and initial or modified PAA have associative structure with friable packing of the polymer segments. They are stabilized by the hydrogen bond system.