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X-ray diffraction profile of PVA hydrogel films produced at the surface of 3-mm-thick PAAm films after immersion in a 15 wt% PVA solution for 3 h (red), 8 h (blue), and 22 h (green). The spectra are compared with those of water (black) and of a physical PVA hydrogel film prepared by five cycles of freezing at −18 °C and thawing at 20 °C. The dashed line indicates the known position of the main Bragg peak of PVA crystals calculated from Bunn (42).
