Fig. 1
From: Bonding dissimilar polymer networks in various manufacturing processes
A hydrogel and an elastomer form covalent bonds after a manufacturing process. a Silane coupling agents are mixed into the precursors of a hydrogel and an elastomer separately. b During the formation of the two networks, the coupling agents are covalently incorporated into the networks, but do not condensate. c After a manufacturing process, the coupling agents condensate, add crosslinks in the individual networks, and form bonds between the networks. A surfactant may further promote adhesion. d Silane coupling agents hydrolyze and form e Silanol groups, which condensate to form f Siloxane bond
