Abstract
A set of rheologic and thermodynamic researches of diluted and semi-diluted aqueous solutions of poly(acrylamide) to poly(vinyl alcohol) grafted copolymers (PVA-PAAN) forming intramolecular polycomplexes (Intra PC) by the methods of static light scattering, interferometry and rheology (for gradients of shear rate j≤1312 s−1) was carried out. It is established, that the thermodynamic water quality towards the copolymers improves, when the quantity N of grafts increases, but on the whole it remains close to θ-solvent. In PVA-PAAN solutions under action of a hydrodynamic shear field two level of reversible structure destruction are shown. The first level is destruction of network of pinnings and the second one is destruction of Intra PC structure together with destroying of primary associates of copolymer macromolecules. It is shown, that the character of destruction (gradual or uneven) and its depth depend on intensity of the hydrodynamic shear field action, concentration of solution and also copolymer structure. Possible reason of reversibility of PVA-PAAN structure destruction in strong hydrodynamic fields is pointed out.
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