Doubly-crosslinked, emulsion-templated hydrogels through reversible metal coordination

摘要

Abstract Double crosslinking can be used to significantly improve the mechanical properties of gels. Here, doubly-crosslinked hydrogel polyHIPEs (DC-PHs), which exhibited rapid water absorption, enhanced mechanical properties, and shape memory behaviour, were generated by forming metal coordination crosslinks within covalently crosslinked hydrogel polyHIPEs (HG-PHs), hydrogels formed by templating within oil-in-water high internal phase emulsions (HIPEs). The HG-PHs were based on acrylamide (AAm) and sodium acrylate (NaA), which provided ? COO ? groups, and were covalently crosslinked with N,N'-methylenebisacrylamide. The metal coordination crosslinking between the ? COO ? groups and Fe3+ was gener