CO2-responsive swelling behavior and metal-ion adsorption properties in novel histamine-conjugated polyaspartamide hydrogel

摘要

Novel polyaspartamide copolymers containing histamine pendants (PHEA-HIS) were prepared from polysuccinimide, which is the thermal polycondensation product of aspartic acid, via a successive ring-opening reaction using histamine (HIS) and ethanolamine (EA). The prepared water-soluble copolymer was then crosslinked by reacting it with hexamethylene diisocyanate in order to provide a hydrogel with both good gel strength and reversible CO2 absorption characteristics. PHEA-HIS gel is also pH-sensitive and eligible to coordinate to metal ions such as Pb2+, Cu2+, and Ni2+ due to the imidazole units in its structure. The CO2-responsive swelling behavior, metal-ion adsorption, and morphology of the crosslinked gels were investigated. The approach described here results is a promising hydrogel with potential for a variety of industrial and biomedical applications including CO2 capture, CO2-responsive and switchable sensors, and smart drug delivery systems. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43305.