In situ elasticity and adhesion measurement of polydimethylsiloxane/ceramic composite membranes by depth-sensing indentation technique

摘要

In the present work, depth-sensing indentation measurements on polydimethylsiloxane (PDMS)/ceramic composite membrane were carried out for measuring the elastic properties of separation layer and the bonding strength at the interface. The role of the roughness of ceramic support on the bonding strength of the composite membrane was studied. The effect of the viscosity of PDMS solution on the mechanical properties of the PDMS separation layer was also investigated. The results of the study indicate that with increasing of the roughness of ceramic support,the bonding strength of PDMS/ceramic composite membrane increases. Because PDMS coating solution fills the rough interface, the area that can sustain tensile forces between the separation layer and porous ceramic support increases dramatically. The viscosity of PDMS solution had little effect on the mechanical properties of the PDMS separation layer. Therefore, the capillary forces dominate the adhesion between the porous ceramic support and the PDMS separation layer when the interface is rough. The mechanism for the interfacial adhesion might be the mechanical interlocking between the PDMS separation layer and the porous ceramic support.