This review summarizes the techniques used in imparting adhesion property to poly(dimethylsiloxane) (PDMS) surfaces. It is well known that the adhesion is strongly dependent on the surface free energy of the substrate, which can be controlled by tuning its hydrophobic/hydrophilic properties. PDMS has very low surface free energy and it can be of interest to alter its surface chemistry by transforming it from hydrophobic to hydrophilic. For this reason, different methods have been developed to introduce functional groups on the PDMS surface. They can reasonably be classified into three main categories: (1) physical approaches, such as plasma/corona discharge treatments, UV-ozone exposure, laser treatments, physical adsorption, (2) wet chemical approaches including layer by layer (LbL) deposition, sol-gel coating, some other wet chemical treatments, and (3) combinations of physical and chemical methods including covalent surface grafting and incorporation of amphiphilic block copolymers.
Key words: Poly(dimethylsiloxane) (PDMS); adhesion; hydrophilicity; physical treatment; surface modification; wet chemical treatment