Surface modification and adhesive-free adhesion of polytetrafluoroethylene (PTFE) and silicone gel containing oleophilic SiO2 powder by plasma treatment

The adhesion strength of PTFE/silicone gel assembly was 0.01 N mm −1 when untreated, but 0.05 N mm −1 and cohesion failure of gel occurred when plasma-treated. When adding SiO 2 powder to gel, the adhesion strength increased from 0.05 to 1.13 N mm −1 .