X-ray powder diffraction studies of polyhydrates of cross-linked tetraisoamylammonium polyacrylates

X-ray powder diffraction studies were performed of the polyhydrates, formed at positive temperature in swelled grains of carboxylic cation-exchange resins in the form of tetraisoamylammonium (cross-linked tetraisoamylammonium polyacrylates, differing in the degree of cross-linking: 1, 2 and 3%). It was shown that the polyhydrates exist as the crystalline phase under specific conditions, determined earlier by DTA technique. Diffraction patterns of the samples, recorded at the temperature + 3 +/- 1 degrees C, indicate that the polyhydrates crystallize in hexagonal symmetry, the unit cell parameters are close to a = 12.25 angstrom, c = 12.72 angstrom and do not depend significantly upon the degree of cross-linking. The suppositions were made concerning the size of hydrate crystallites, formed in the swelled grains of the studied resins.