A complete investigation of poly(2,6-dimethyl-1,4-phenylene) AEMs with different quaternary ammonium groups is provided comparing the properties and fuel cell performance.
With
polystyrene (PS) microspheres as the matrix and glycidyl methacrylate
(GMA) and methyl methacrylate (MMA) as monomers, two polymer brushes
including a homopolymer brush of PS–PGMA and a block copolymer
brush of PS–P(MMA-b-GMA) were synthesized
via surface-initiated activators regenerated by electron-transfer
atom-transfer radical polymerization. Furthermore, a ring-opening
reaction between epoxy groups in these brushes and hydroxyl groups
in 4-hydroxy-2,2,6,6-tetramethylpiperidinooxy (4-OH-TEMPO) was carried
out, consequently obtaining nitroxide polymer brushes of PS–PGMA–TEMPO
and PS–P(MMA-b-GMA)–TEMPO. The obtained
nitroxide polymer brushes were characterized using a variety of analytical
techniques. The nitroxide polymer brush as a supported inhibitor was
successfully applied in the synthesis of epoxidized soybean oil acrylate
(AESO), showing a good inhibiting effect and easy recyclability. Then
the supported TEMPO inhibitor (nitroxide polymer brush) and free TEMPO
inhibitor (4-OH-TEMPO) were combined as a compound-inhibiting system
to synthesize AESO. After synthesis, the supported inhibitor was recovered
by filtration and the free inhibitor was reserved in AESO to prevent
it from gelling in the storage process. AESO with excellent performance
and low inhibitor residual was obtained through use of this combined
inhibitor.
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