A microporous polymer with sulfide and thiol groups was synthesized using the thiol-yne reaction. Au nanoparticles were prepared by in situ reduction reaction inside the polymer and were found to be well dispersed. The Au-containing polymer showed catalytic activity in the reduction of 4-nitrophenol.
A compressible microporous polymer
monolith (MPM) was prepared
by performing the Sonogashira–Hagihara reaction between 1,4-diiodobenzene
and 1,3,5-triethynylbenzene in a gel state without stirring. MPM was
functionalized via the click reaction with 1,3,5-tris(azidomethyl)-2,4,6-trimethylbenzene
and 2,6-diethynylpyridine. MPM showed superhydrophobicity but became
hydrophilic after the click reaction. The functionalized MPM (F-MPM)
had polar triazole groups generated by the click reaction, which were
used as coordination sites for Co(II) ions. Cobalt nanoparticles were
loaded to F-MPM through in situ reduction of coordinated Co(II) ions
to produce a monolithic Co heterogeneous catalyst (Co-MPM). The microscopic
study showed that MPM, F-MPM, and Co-MPM consisted of fiber bundles,
together with spherical particles on the micrometer scale. Co-MPM
was used for tandem catalysis. Co-MPM promoted the reaction of dehydrogenation
of ammonia borane and hydrogenation of nitro compounds in one pot
to give amine products. The reactions with the compression and release
process were much faster compared with the reactions performed under
the stirring conditions, suggesting that the repeated compression
and release facilitated interfacial contact between the reactants
and active sites in Co-MPM.
A flexible microporous polymer paper (MPP) is prepared with the polymer tubes obtained from the Sonogashira coupling reaction of 1,4‐diiodotetrafluorobenzene and 1,3,5‐triethynylbenzene. MPP has an interconnected network structure of polymer tubes and shows a hierarchical pore structure. Relatively large pores are formed among entangled polymer tubes, while micro‐ and mesopores are generated in the tube walls. MPP is foldable, mechanically stable, and stretchable. When the folding stress is removed, a wrinkle forms along the folded line, as observed in common papers composed of cellulose pulps. The mechanical stability of MPP results from electrostatic interactions between electron deficient tetrafluorobenzene units and electron rich triethynylbenzene units in the polymer. The tensile stress–tensile strain curve shows that MPP can elongate up to 15% strain. MPP is superhydrophobic, showing a water contact angle of 162° and can be used for the filtration of small molecules such as a dye and iodine.
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