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An aluminum fluoride film covered by graphite fluoride on metallic aluminum was prepared by reaction in the ternary system of aluminum, graphite and fluorine gas at 450–550 °C. The film consisted of a large amount of aluminum fluoride covered by thin graphite fluoride layers. The contact angle of a water drop on the film was around 120°, which decreased to 85–95° during 45 d probably due to reaction with moisture and/or water drop. Almost no oxygen was detected in the film. The film formation would be based on the reduction of oxide layer on aluminum by carbon radical produced by thermal decomposition of graphite fluoride.

Abstract:We investigated the hydrophilicity of fluorinated carbon fibers at room temperature, that is a new method of surface treatment, and found that through this treatment, wettabillity of the surface of car bon fibers increased dramatically without decrease of tensile strength. Observation by scanning electron microscope (SEM) showed the same surface morphology of fluorinated carbon fibers as that of original fiber.On the other hand, of anodic oxidated fibers. In the case of anodic oxidation as the wettabillity of oxidated fibers increased, the surface roughness increased and resulted in the decrease of tensile strength.

ABSTRACT:A new technique is presented to measure the concentration of fluorine in a reaction gas consisting of fluorine, nitrogen, and oxygen in a reaction chamber. The method is described as follows: The gas is directly taken from the chamber using a peristaltic pump and dissolved in a TISAB (total ionic strength adjusted buffer) solution. The concentration of fluorine ion is measured using the selected fluorine ion electrode, the output voltage of which is monitored. The concentration of the fluorine ion and the output voltage follow the Nernst relation so that the measurement of the output voltage of the system enables us to know the concentration of fluorine gas. This technique was applied to monitor the concentration of fluorine gas in the chamber in which a sheet of polyethylene nonwoven fabric was continuously oxy-fluorinated. The monitored concentration of the fluorine gas as a function of time coincided with the variation of the incorporated fluorine in the sheet measured by X-ray fluorescence (XRF) spectroscopy after the treatment. This technique can be best used for process control of the continuous oxy-fluorination of polymeric materials. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 684 -691, 2002

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