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A composite membrane, composed of polypyrrole anisotropically incorporated into an anion exchange membrane, when placed between platinum plates, produced an e.m.f. which changed with relative humidity like a hygrometer; a lithium battery with an e.m.f. of 2.5 V has been obtained by piling up the composite membrane, swollen with propylene carbonate, on lithium foil.
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Sata et al. (1989) studied this question.
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