Spectrum-stable hyperbranched polyfluorene with photocrosslinkable group

Polyfluorenes

“…Photo-cross-linkable groups were introduced into the side chains at C-9 positions of fluorene, and then hyperbranched PFs of P58 and P59 (Scheme 9.31) were synthesized by the Suzuki coupling reaction [103,104]. The polymers with higher content of the core exhibit more stable PL spectra even after annealing at high temperature.…”

Polyfluorene‐Based Blue‐Emitting Materials

“…In order to utilize this technique, we introduced photocrosslinkable groups into the side chains at C-9 positions of fluorenes and synthesized blue-emitting hyperbranched PFs P10 and P11. [35,36] These polymers can be crosslinked photochemically by the crosslinkable group and the photocrosslink has little influence on the PL spectra of the polymers. These hyperbranched crosslinkable PFs possess no distinct T g before 200 8C and exhibit good thermal stability with T d higher than 350 8C.…”

Star‐like polyfluorenes based on 2,4,6,8, 10,12‐hexabenzyl‐2,4,6,8,10,12‐hexaazaisowurtzitane caged‐core: toward non‐aggregating, blue‐light‐emitting polymers

“…Various methods have been developed to solve the above‐mentioned problem, for example, copolymerizing or modifying at C‐9 with groups bearing huge space volume,7–10 designing star‐like, hyper‐branched, or cross‐linked architectures,6, 11–15 and chemically grafting with non‐conjugated chain segments 16, 17. Among these methods, star‐like or multi‐armed polyfluorenes are relatively easy to synthesize, and more significantly, this way, has more possibility to enhance the degree of decreasing excimer formation6 compared with copolymerizing or C‐9 modifying method.…”