《Table 1 Inherent viscosities and molecular weights of the polymers》

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《基于乌尔曼偶联反应制备的密集季铵化型全钒液流电池阴离子交换膜（英文）》

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a) After bromination；b) after quaternization.

The octa-benzylmethyl-containing poly（fluorenyl ether ketone）s（OMPFEKs）were synthesized by the condensation polymerization of compound b with various amounts of 9，9-bis（4-hydroxyphenyl）fluorene and 4，4’-difluorobenzophenone.Fibrous products with inherent viscosity of～0.6 dL g-1and number-average molecular weight of～60 kDa were achieved（Table 1）.The representative1H NMR spectra of OMPFEK-20 are shown in Fig.2，with the two singlet peaks at 2.07 and 2.10 ppm being assigned to the benzylmethyl groups.The bromination of OMPFEKs converted the benzylmethyl groups to the bromomethyl groups to yield Br-OMPFEKs，with the corresponding1H NMR peaks showing at 4.30 and4.33 ppm.Based on the integral area ratio of the peak for the bromomethyl groups and the peak for the remaining benzylmethyl groups，a conversion degree of～80%can be derived for the Br-OMPFEKs.The number-average molecular weight of Br-OMPFEKs are decreased to～50 k Da，Table 1，probably because of minor cleavage of polymer backbone during bromination.Treating the Br-OMP-FEKs with trimethylamine，the quaternary ammonium functionalized poly（fluorenyl ether ketone）s（QA-OMP-FEKs）were obtained，as evidenced by the1H NMR spectrum in Fig.2.It can be seen that a new broad peak at～3.23 ppm shows up for the QA-OMPFEK-20 compared to the1H NMR spectrum of Br-OMPFEK-20.This broad peak indicates the successful conversion of bromomethyl groups to QA groups.In another word，the QA groups have been tethered successfully to the benzylmethylcontaining segments of OMPFEKs as designed.