Rakovich I. Graft copolymers on the basis of polyvinyl alcohol and poly(acrylamide) with various length of graft chains.

Thesis for a Candidate of Chemical Sciences Degree, Specialty 02.00.06 - Chemistry of High Molecular Compounds. Kyiv Taras Shevchenko National University, 2003. Thesis is devoted to synthesis and studying a structure, thermostability state in a solution and also some functional possibilities of poly(acrylamide) to polyvinyl alcohol graft copolymers (PVA-PААN) that form IntraPC in dependence on the length of graft. It is established that when molecular weight of grafts increases above the certain critical value a process of detachment of grafts from the main chain proceeds. In correspondence with that for the example having МPAA>М* a microphase separation in the stucture of the copolymer is observed. In such structure areas of the polymer compatibility exist to gather with formed by segments of PAA only. Thermodynamic quality of water as a solvent in the graft copolymers improved with an increase of molecular weight of grafts. It is found that with the increase of the length of grafts conformational transition connected with destruction of the IntraPC structure under the effect of a temperature goes at less temperatures. Basing on PVA-PААN with different length of grafts there are developed high efficient floculants Unicomflocintra for the purification of natural (river) water. There established a mechanism of graft copolymers interaction with some organic components of river water: humine acids and phenol. It is shown that such interaction essentially influences the development of competitive processes while floculation. Key words: graft copolymer, intramolecular polycomplex, hydrogenic bond, floculation, competitive interaction.