Synthesis and self-assembly of a series of π-conjugated triblock copolymers containing polyfluorene and poly(ethylene oxide)

Synthesis and electron transporting properties of triblock copolymers consisting of polyfluorene and polystyrene

“…3) Unfortunately, the trapping processes are considered to be unavoidable in organic semiconductors, 4) and the origin is related to intrinsic defects (such as kinks in the polymer backbone), 7) impurities remaining from the synthesis or contamination from the environment. 8) To overcome the reduction caused by charge traps in PLED performance, various strategies were proposed, including ascending the density of charge trap by diluting electron traps, 9,10) raising the regularity of structure by planarizing backbone structure 11,12) or forming microphase separation structure, [13][14][15] and forming new charge injection path by introducing new deeper hole traps. [16][17][18][19][20] Our strategy here is based on the idea of introducing nonfluorescence, electrically inert polystyrene (PSt) to the ends of poly(9,9-di-n-octylfluorene) (PFO) to form a triblock copolymer.…”

Fabrication of Conjugated Amphiphilic Triblock Copolymer for Drug Delivery and Fluorescence Cell Imaging

“…This property should be attributed to the self-assembly of the block copolymer into nanostructured aggregates with the hydrophilic POEGMA block as the outer corona for particulate stabilization. The CMC of both triblock copolymers was determined by using the fluorescence property of PF . As shown in Figure , the slope of the PL intensity at λ = 420 nm decreased dramatically with further increases in the concentration of P1 and P2 in water at the CMCs of ∼6.0 × 10 –3 (Figure a) and 2.1 × 10 –3 (Figure b) mg/mL, which suggests the transition of photoluminescent PF block from the water-rich media to the water-free core of the micelles.…”

“…The general procedure of polymerization was carried out through the Suzuki coupling reaction. 38 9,9-Dihexyl-2-bromo-7-4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl fluorine (1.69 g, 3.15 mmol), sodium carbonate (1.82 g, 17.20 mmol), Pd(PPh 3 ) 4 (60.26 mg, 0.052 mmol), and 4-bromobenzyl alcohol (385.59 mg, 1.89 mmol) were dissolved in DMAc (25 mL). After three freeze−pump− thaw cycles, the mixture was vigorously stirred at 120 °C for 72 h, and then phenylboronic acid (1.92 g, 15.75 mmol) was added.…”

Suzuki–Miyaura catalyst-transfer polycondensation of triolborate-type fluorene monomer: toward rapid access to polyfluorene-containing block and graft copolymers from various macroinitiators

“…In the former approach, it is necessary to add one of the components in excess to complete the reaction, which makes product isolation difficult (Figures 1A). [28][29][30][31][32][33][34][35][36] In contrast, the latter approach can avoid such complicated product isolation, making it more synthetically useful (Figures 1B). Nevertheless, the method using PF as the macroinitiator is limited to the combination with atom transfer radical polymerization (ATRP), [37][38][39] anionic ring-opening polymerization (ROP), 40 and reversible addition fragmentation chain transfer (RAFT) polymerization.…”

“…Nevertheless, the method using PF as the macroinitiator is limited to the combination with atom transfer radical polymerization (ATRP), [37][38][39] anionic ring-opening polymerization (ROP), 40 and reversible addition fragmentation chain transfer (RAFT) polymerization. 41 Since PF-containing block and graft copolymers are promising for a wide variety of device applications , 4,6,10,12,13,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] it is of great interest to realize the synthesis of block and graft copolymers via PF chain extension using various macroinitiators.…”