Studium dynamického chování molekul ve směsích voda/ethanol

Abstract

In the diploma work we studied mixtures of water, ethanol and poly(vinyl methyl ether) (PVME) by the methods of Nuclear Magnetic Resonance (NMR) and Differential Scanning Calorimetry (DSC). NMR studies of water/ethanol binary mixtures between 10 - 90 vol.% of ethanol for wide temperature range comprised chemical shifts, relaxation times, translation diusion coecients, Nuclear Overhauser Eect of ethanol spectra and calculation of hydrodynamical radii. Most of the results show extremal values around 50 vol.% of ethanol. DSC provides measurements of pure PVME, water and ethanol, then binary water/ethanol mixtures and PVME/water/ethanol mixtures in the whole ethanol concentration region and low PVME concentrations. The high concentratios of the PVME/water mixtures were prepared and measured. We obtain detailed description of PVME/water/ethanol mixtures - glass transition temperature, crystallization, melting and phase separation temperature.