Permanent Hydrophilic Surface Formation by Ion Assisted Reaction

S-K Koh, C. Lee, J.H. Lee, B.K. Kang, H. Kaji, M. Hayashi
GL Materials, Inc., KR

Keywords: ion beam, irradiation, hydrophilic, surface, modification

Summary:

Since permanent hydrophilic polymer surfaces from hydrophobic polymers (PMMA, PTFE, PET, and PC) have been demonstrated by Ion Assisted Reaction(IAR) at MRS, 1995 Fall meeting, Boston, in which energetic ions( 0.5-1.5 keV) are irradiated on the materials with blowing reactive gases near the irradiating surfaces, the IAR technique has been extended to various polymers for creation of wettable surfaces from hydrophobic surface. The improvements of adhesions, wettability and surface energy are mainly due to polar force and hydrophilic functional groups such as C=O, (C=O)-O, C-O, etc., without damaging the surface mainly due to polymer chain scission. New PTFE/ perfluorosulfonated ionomer(PFSI) composite membrane for fuel cell were fabricated by the surface modification of PTFE membrane. Advantage of permanent wettable PTFE membrane with various pore size were easy addition of PFSI to micro porous structure and strong adhesion between PTFE and PFSI. Advantages of the IAR are 1)high reproducibility, 2)simplicity, and 3)easy connection to conventional semiconductor process line, and current status of the surface modification technologies are presented