With 1,4-bischloromethyoxyl butane as chloromethylated reagent, the chloromethylated polysulfone (CPS) was obtained by introducing chloromethyl group onto main chain of bisphenol type A polysulfones (PS) according to Fridel?Crafts alkylation reaction. Subsequently with 2-naphthol-6,8-disulfonic acid dipotassium (HNS) as nucleophilic reagent, the naphthalenesulfonic acid type side chain sulfonated polysulfones (PS-NS) were prepared by nucleophilic substitution reaction. Their chemical structures were characterized by FT-IR and 1H-NMR. The relationship between nucleophilic substitution reaction and factors was explored and the appropriate reaction conditions were found. The corresponding proton exchange membranes (PEMs) were fabricated by solution casting method and the basic properties of PEMs including water uptaking and proton conductivity were explored. The results showed that the nucleophilic substitution reaction was SN1 reaction. The appropriate reaction solvent was dimethyl sulfoxide (DMSO) which had strong polarity, the appropriate reaction temperature was 100℃ and the appropriate reaction time was 40 h. The bonding amount of sulfonate acid group reached up to 1.51 mmol/g at the appropriate reaction conditions. The corresponding PEMs indicated excellent water uptaking and proton conductivity due to the side chains structure enhancing the degree of micro-phase by locating the sulfonic acid groups far away from the hydrophobic polysulfone main chains. The water uptaking and proton conductivity of PEMs increased with the bonding amount of sulfonic acid group increasing. The water uptaking and proton conductivity of PEMs reached up to 21.3% and 0.049 S/cm at room temperature, respectively. The properties of PEMs could meet the demand of actual application of proton exchange membrane fuel cells, and these properties were very close to the commercialized Nafion117 series proton exchange membranes.
Zongwen QIAO Long MENG Tao CHEN
. Preparation and properties of naphthalenesulfonic acid type polysulfone proton exchange membrane[J]. The Chinese Journal of Process Engineering, 2019
, 19(2)
: 413
-418
.
DOI: 10.12034/j.issn.1009-606X.218235
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