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Chlorine And Polymers/Membranes

Chlorine And Polymers/Membranes

Chlorine And Polymers/Membranes

(OP)
I am currently looking for a polymer film/membrane to use in a chlorine sensing electrode.  The material must allow chlorine in solution to permeate through in the form of free available chlorine (HOCl) and total residual chlorine (chloroamines, HOCl et al.).  It does not matter if other species will be able to permeate through, but minimal water permeation is mandatory!!  The electrode would be used in industrial, in-line application and may be subject to high temperatures and pressures.  I have already tried a number of polymer films (nylon, PVC, polyimide, polycarbonate, polysulphone) that have failed to read chlorine.  I have a suspicion that it is because these films are hydrophobic therefore not allowing any solution permeation whatsoever.  Right now I am considering teflon PTFE due to chlorine's abaility to permeate through it with minimal water absorption and its resistance to chlorine oxidative attack.  ANY info/suggestions is appreciated!!!
mlovin

RE: Chlorine And Polymers/Membranes

PTG Biospans ,  TSP hydrophilic coatings

RE: Chlorine And Polymers/Membranes

Hi Mlovin,

I don't know if it's too late to reply your threat because you've posted it for a long time. I'm working on a project to develop a sensor to measure hydrogen in a presence of Chlorine. The objective is to find a material- membrane or coating material- that can block chlorine but can give passage to hydrogen. I think the fail results of my work would be useful to you. Anyway, there were results from previous study stated that "Teflon, Fluorodyn sheet or Kynar" allow chlorine to pass through so maybe you can try these materials.

good luck   

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