Influence of the NaIO4 Concentration on the Gelation and the Adhesive Strength of Pyrocatechol/Pyrogallol Containing Gelatin Hydrogels

The presence of catechol groups in hydrogels, either grafted to the constituting polymers or added gel formulation allow increase adhesion strength such hydrogels. In this investigation, we add pyrocatechol (1,2-benzenediol) and pyrogallol (1,2,3-benzenetriol) gelatin solution form hydrogels using sodium periodate as an oxidant with aim induce interactions between pyrocatechol/pyrogallol chains. gelation kinetics well their toughness are evaluated a function concentration NaIO 4 for constant concentration-10 mM-in pyrocatechol/pyrogallol. It came out that addition (10% w/v) did not improve on stainless steel when compared pristine gel. As interesting finding, allowed major improvement adhesive two plates stabilize up 50°C. However, modified gels displayed no thermal stabilization gelatin. differences explained basis electrophilicity oxidized polyphenols. addition, self-healing behavior based was investigated composition.