Alkali-stable quaternary phosphonium (QP) is a type of cationic group for hydroxide exchange membranes (HEMs). To elucidate the relationship between structure and alkaline stability, we investigated the kinetics and degradation mechanism of a series of QP cations by both experiment and computation, and established a semi-empirical formula based on the Taft equation to directly estimate alkaline stability of QP cations from the P NMR chemical shift and the steric substituent constant , facilitating the search for QP cations with improved alkaline stability.
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| http://dx.doi.org/10.1039/c8ra03440k | DOI Listing |
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