✍ Scribed by M. Walker; K.-M. Baumgärtner; M. Kaiser; J. Kerres; A. Ullrich; E. Räuchle
No coin nor oath required. For personal study only.
The permeability of Nafion117 and some types of acid-base and covalently crosslinked blend membranes to methanol was investigated. The methanol crossover was measured as a function of time using a gas chromatograph with a flame ionization detector. In comparison to Nafion, the investigated acid-base and covalently crosslinked blend membranes show a significant lower permeation rate to methanol. Additionally, another method to reduce the methanol permeability is presented. In this concept a thin barrier layer is plasma polymerized on Nafion 117 membranes. It is shown that a plasma polymer layer with a thickness of 0.3 m reduces the permeability to methanol by an order of magnitude.
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