2017 年 38 巻 2 号 p. 61-66
Adhesion between dissimilar materials is one of important issues in materials technologies. The bond formation between dissimilar materials should be effective to achieve the adhesion between the materials. Herein we conduct the direct adhesion of materials using non-covalent bond and covalent bond formation. We observed an external stimuli responsive adhesive system between cyclodextrin host-gels (CD gels) and guest molecules modified glass substrates (guest Sub). Using Suzuki-Miyaura cross-coupling reaction as covalent bond formation reaction, we observed direct adhesion between dissimilar materials (polymeric and inorganic materials). Glass substrate modified with iodoaryl group (I-Sub) selectively adhered to the hydrogel with an phenyl boronic acid (PB gel) using the cross-coupling reaction. The object (adhered PB gel and I-Sub) did not separate because the covalent bonds do not decompose and dissolve upon immersing into organic solvents. Cu-catalyzed azide-alkyne cycloaddition reaction and Sonogashira cross-coupling reaction can be applied to direct adhesion between gels and glass substrates. These results indicate that these reactions can be used for direct adhesion between dissimilar materials.
