||In this study, Hexamethyldisilazane (HMDSZ) plasma (PD-HMDSZ) was used to deposit hydrophobic film on polymers such as polyethylene terephthalate (PET), TPU nonwoven and glass substrates. Plasma system is use a bell-type reactor with internal electrode, 13.56MHz, electrode spacing 5 cm, and 10 cm diameter electrodes, power of 150W. The specimen was put into the chamber after cleaning. The chamber was evacuated to 30mtorr and introduce HMDSZ monomer gas for plasma deposition 5 minutes. Then, oxygen plasma etching technique was employed to produce porous structure and to increasing surface roughness of the specimen. Finally, it was treated again with hydrophobic coating by PD-HMDSZ. The result of water contact angle (WCA) reveals that it is more hydrophobic as compared to the one without oxygen plasma post treatment. The surface properties of TPU non-woven can be controlled its hydrophilic and hydrophobic property by plasma treatment. After using oxygen plasma to etch the oxide, it becomes super-hydrophilic and stable even after 20 days. Roughness of surface are dependent on the time of oxygen plasma treatment. A more hydrophobic surface was obtained retreated by PD-HMDSZ, and water contact angle of non-woven TPU increases from 0 degree to 149.8 degree.
Porous Ultra High Molecular Weight Polyethylene (UHMWPE) has excellent biocompatibility. It is widely applied in the field of medicine as a biomaterial. It can be used in medical polymer devices, such as heart valves, artificial joints and surgical correction, etc. In this study, HMDSZ monomer was deposited on UHMWPE surface by cold plasma deposition and the change of surface hydrophobicity were investigated after modification. It could be found that the WCA was very stable about thirty days after HMDSZ plasma treatment on UHMWPE. The WCA of oxygen plasma treatment was also stable after ninety days. Using scanning electron microscopy (SEM) the dendritic structures on the surface of 1 minute oxygen plasma treatment could be observed. Over 5 minutes HMDSZ plasma treatment, the surface of substrate became smooth and the hole is disappear. It would be found the creaks on the film. Higher power of oxygen plasma treatment, the deposited film on the surface would be decomposed causing clogging pores. In this study, the effect of the plasma treatment times on the holding holes.