Proton conductivity of poly(dipropyl)phosphazene-sulfonated poly[(hydroxy)propyl, phenyl]ether-H3PO4 composite in dry environment

A new composite material was fabricated by heat pressing a powder mix containing a sulfonated poly[(hydroxy)propyl, phenyl]ether (SPHPE), with empirical formula [-O-Ar-C(Me)2-Ar(SO3H)0.4-O-CH2CH(OH)-CH2-1.5 H2O]n, and poly(dipropyl)phosphazene (PDPrP) to yield a film which was soaked in 85% H3PO4 (P...

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Bibliographic Details
Published in:Solid state ionics 2005-11, Vol.176 (37-38), p.2819-2827
Main Authors: Dotelli, Giovanni, Gallazzi, Maria C, Perfetti, Giancarlo, Montoneri, Enzo
Format: Article
Language:English
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Summary:A new composite material was fabricated by heat pressing a powder mix containing a sulfonated poly[(hydroxy)propyl, phenyl]ether (SPHPE), with empirical formula [-O-Ar-C(Me)2-Ar(SO3H)0.4-O-CH2CH(OH)-CH2-1.5 H2O]n, and poly(dipropyl)phosphazene (PDPrP) to yield a film which was soaked in 85% H3PO4 (PA) and dried. The final SPHPE-PDPrP-PA film (0.15 cm thick) contained -SO3H functional groups and H3PO4 at 0.16 SO3H/N and 1.72 H3PO4/N mole ratios. For the phosphazene polymer, at least two types of repeating units were present, i.e., -P(CH2CH2CH3)2=N- and -P(CH2CH2CH3)2=NH+(H2PO4-H3PO4)- at 0.18 N/NH+ mole ratio. This material exhibited proton conductivity (sigma,Omega-1 cm-1) of 2.27 10-4-7.10 10-3 at 24-127 deg C in dry environment, and of 4.79 10-4-1.54 10-3 at 45-65 deg C and 11% relative humidity. The results for SPHPE-PDPrP-PA composite are discussed by comparison to available literature data for other composites and polymers containing N protonated by H3PO4.
ISSN:0167-2738
DOI:10.1016/j.ssi.2005.09.008