Photochemical modification of polytetrafluoroethylene into oleophilic property using an ArF excimer laser

Abstract

Photochemical modification of the polytetrafluoroethylene (PTFE) with incorporation of the CH3 radical released from the B(CH3)3 molecule excited by an ArF excimer laser has been demonstrated. The incorporation of CH3 radicals and the depletion of fluorine atoms of the polymer surface were studied by XPS analysis and infrared ATR spectrum measurement. In these photochemical reactions, the photoirradiated surface changed into oleophilic. The properties were studied by contact angle measurement. The stability of the oleophilic surface was examined at the elevated temperature of 200 °C for 6 h in O2 or N2 ambient and also by immersing in alkaline or acid water solutions.

Photoablation of Polymer Materials

“…With laser treatment in reactive atmosphere (e.g., hydrazine [100,101]) or under various liquids (e.g., B(CH 3 ) 3 [102,103]), the F--C bonds on the surface can be broken, CH 3 radicals or amino groups can be incorporated, allowing to apply a coating after laser treatment. This surface modification takes place without detectable ablation.…”

Area-selective nucleation of copper on fluorocarbon–resin surface using ArF excimer laser-induced chemical modification

“…4 On the other hand, our work has reported the laserinduced chemical modification of fluorocarbon-resin surface: the C-F bonds of the photoexcited surface are easily defluorinated by boron, aluminum, or hydrogen atoms, having a higher binding energy with fluorine atom than the C-F; dangling bonds of the defluorinated carbon atoms are bonded with a functional group. [5][6][7] This letter is based on these previous works. We concentrated on demonstrating that such defluorinated surface effects serve to form the chemical bonds of copper.…”

Surface modification of polymers by atomic oxygen using ECR plasma

“…A study of surface energy is found to be one of the best methods for estimating the nature of chemical change occurring on the polymer surfaces. The surface modification techniques such as irradiation with energetic ions [11], exposure to gaseous plasmas [12], UV radiation, etc [13][14][15] have been used for improving the surface properties of the polymeric materials without affecting the bulk properties [16]. In the present work, the irradiation effects of oxygen ions produced in the ECR plasma on the surfaces of the polyimide and the FEP have been studied.…”