Abstract
The interaction between poly-N-vinylpyrrolidone (PV) and D 2O molecules has been investigated by IR-spectroscopy. Spectrum parameters have been measured for the absorption bands of PVP in the spectra of hydrated polymer films and solutions with various molar ratios R m=[D 2O] : [PVP], and 0 ⩽ R m ⩽ 260. Various states of PVP lactam rings relative to R m have come to light. With R m=0, the majority of the CO groups in PVP interact slightly with CH 2 groups of the polymer by a donor-acceptor mechanism, while other CO groups remain free. The hydration of PVP is realized through two unshared pairs of electrons of carbonyl oxygens (unshared pairs of p-electrons of nitrogen atoms do not participate in hydration of the polymer). Associates of lactam pendants with one H 2O molecule (at R m<1·7—with two H 2O molecules) were found in the case of low degrees of hydration ( R m<1·7) of PVP films. Associates With one and two H 2O molecules are in equilibrium in solutions of PVP in water ( R m = 260). If the solution temperature is lowered, this equilibrium is displaced towards formation of associates with two molecules of water.
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