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Structure and properties of nanophase separated hydrogels
Lungová, Marta ; Hanyková, Lenka (referee) ; Krakovský, Ivan (advisor)
A central goal of this work is study of structure and mechanical and thermal properties of hydrogels prepared by swelling of hydrophilic polymer networks in water. To this purpose series of epoxy networks was prepared by reaction of ,- diamino terminated poly(oxypropylene)-b-poly(oxyethylene)-b-poly(oxypropylene)- with aromatic diepoxide (Bisphenol A propoxylate diglycidyl ether). Network formation process was monitored by Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). Nanophase separation in the networks prepared has not been found by dynamic mechanical analysis (DMA) or differential scanning calorimetry (DSC). On the other hand, nanophase separated structure of the hydrogels has been revealed by small-angle neutron scattering (SANS). SANS data were fitted well using Teubner-Strey model based on the locally lamellar structure of water-rich and water-poor nanodomains and values of model parameters are determined. Formation of nanophase separated structure is attributed to high difference in the interaction of network components with water. Influence of water on thermal transitions in hydrogels is studied by DSC.

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4 Lungová, Monika
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