Monofluorobenzene end-capping reagent, preparation method and application thereof, and synthesis of benzene-terminated polyaryletherketone

The invention relates to a monofluorobenzene end-capping reagent, a preparation method and application thereof, and synthesis of benzene-terminated polyaryletherketone, the monofluorobenzene end-capping reagent has a structure as shown in a formula I: F-R1-O-R2, R1 contains at least one phenyl group, and when a plurality of phenyl groups exist, the plurality of phenyl groups are connected through a ketone group, a sulfuryl group and an ether group; r2 is one of a benzophenone group, a biphenyl group and a diphenyl ether group; the preparation method comprises the following steps: heating a difluorobenzene compound and a monohydroxy benzene-containing compound to 140-180 DEG C, carrying out nucleophilic reaction, carrying out aromatic nucleophilic polycondensation reaction to obtain hydroxyl-terminated polyaryletherketone, and adding the monofluorobenzene end-capping reagent for end capping to obtain benzene-terminated polyaryletherketone; when the monofluorobenzene end-capping reagent provided by the inventio