Abstract
Hydration in thermo-responsive polymer hydrogels, such us poly(oligo(ethylene glycol) methyl ether methacrylates) (POEGMAs) is a key factor in understanding their thermo-responsivity. The hydration of POEGMAs with different length of side groups was comprehensively studied for the first time. The comparative studies have shown that hydration of different hydrophilic centres in various POEGMAs is similar and independent of oligoether chain length. Only some quantitative differences in bound water structure, especially at the first stage of hydration have been found. However, the crystallinity (if it occurs) significantly impacts on the hydration process. Finally, the water structure is the closer to the bulk water structure in the fully swollen PMEO2MA hydrogel than in other POEGMA systems with longer oligoether side groups.
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