Preparation and Properties of Multi-cations-photocrosslinked Polyarylpiperidine Anion Exchange Merbrane
In this paper,the poly(biphenyl N-methyl piperidine)(PB)backbone was first synthesized via superacid-catalyzed polycondensation,then the crosslinker N1,N6-bishexene-N1,N1,N6,N6-tetramethylhexane-1,6-diammonium bromide(HETD)was prepared.Finally,a series of cross-linked polyaryl piperidine anion-exchange membranes QPBP-HETD-X％with different HETD contents(X=20,40,60 and 80,where X represents the molar content of HETD)were prepared using UV cross-linking reactions.The result showed that,the introduction of multi-cation crosslinking structure effectively improves the mechanical strength and electrochemical performance of the membrane.Among them,QPBP-HETD-60％has good comprehensive performance,with a ionic conductivity of 59.08 mS/cm(80 ℃),the swelling rate is only 4.15％(room temperature),the tensile strength is 42.93 MPa,and the conductivity residual is 84.42％after 360 h treatment with 1 mol/L NaOH at 60 ℃.
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