Properties of poly(vinyl alcohol)-graft-polyacrylamide copolymers depending on the graft length. 3. Benzene solubilization by solutions of the copolymer |
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Authors: | Nina Zagdanskaya Lesya Momot Tatyana Zheltonozhskaya Jean-Michel Guenet Vladimir Syromyatnikov |
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Institution: | 1. Kiev Taras Shevchenko National University, Chemical Department, 64 Vladimirskaya Str., 01033 Kiev, Ukraine;2. Institut Charles Sadron (CNRS-ULP) UPR 22, 6, rue Boussingault, 67083 Strasbourg Cedex, France |
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Abstract: | The peculiarities of poly(vinyl alcohol)-graft-polyacrylamide copolymers (PVA-g-PAA), which are characterized by the equal average number (N=9), but various molecular weight (or length) of graft chains, in comparison with individual PAA and PVA, were investigated in aqueous medium. Sharp rise in benzene solubilization in PVA-g-PAA solutions at MPAA higher than 4.3·105 has been established. It was shown that such effect is stipulated by the destruction of intramolecular polymer-polymer complex in the copolymer and increasing the benzene binding to separate PVA-g-PAA groups by means of hydrogen bonds. The changes in the PVA-g-PAA solubilizing ability as the function of temperature were also investigated. The obtained results are discussed from the point of view of conformational transitions of intramolecular polymer-polymer complexes (intraPPC), which exist in copolymers, in dependence on the length of graft chains. |
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Keywords: | benzene solubilization graft copolymer intramolecular polymer-polymer complexes polyacrylamide poly(vinyl alcohol) |
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