A new hyper-branched water-soluble polymer was synthesized by reacting β-cyclodextrin with pyromellitic dianhydride beyond thecritical conditions that allow the phenomenon of gelation to occur. The molar ratio between the monomers is a crucial parameterthat rules the gelation process. Nevertheless, the concentration of monomers in the solvent phase plays a key role as well. Hyperbranchedβ-cyclodextrin-based polymers were obtained performing the syntheses with excess of solvent and cross-linking agent,and the conditions for critical dilution were determined experimentally. A hyper-branched polymer with very high water solubilitywas obtained and fully characterized both as for its chemical structure and for its capability to encapsulate substances. Fluoresceinwas used as probe molecule to test the complexation properties of the new material.
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