A common route to A2B and A3B multiarm star block copolymers

Controlled release of biocides in solid wood. III. Preparation and characterization of surfactant‐free nanoparticles

“…Such a situation led to the presence of the PS 3 C − carbanion (Scheme ) with the unreacted excess of di‐1‐C. We have already shown8 that the diphenylethylenyl carbanion causes NS on the CH 2 OSi and CH 2 OCH 3 groups. Therefore, we checked this NS on di‐1‐C with a PSLi end‐capped with DPE.…”

“…DPE derivative chemistry has allowed us to open new routes toward ABC, A 2 B, and A 3 B star block copolymers. The ABC type can be obtained through a heterobifunctional macroinitiator route4–6 with the 2‐Si derivative (Scheme ), whereas the A 2 B and A 3 B types can be obtained with the same 1‐Si derivative7, 8 according to the medium polarity. After the first expected reaction of a polystyryl on the 1‐Si double bond, we observed in a polar medium a 1,6‐elimination reaction of the OSi group followed by a second addition, whereas in a nonpolar medium, nucleophilic substitution (NS) on the CH 2 OSi group took place.…”

pH‐Responsive H‐Type PMAA2‐b‐HTPBN‐b‐PMAA2 Four‐Arm Star Block Copolymer Micelles for PTX Drug Release

“…In the meanwhile, the controlled release and targeted administration of drug can be achieved by introducing stimuli‐responsive groups, etc. Various block copolymers with different compositions and architectures have been synthesized, which includes linear and well‐defined copolymers such as brush, comb, star (Y and H type, etc), hyperbranched, and dendrimers, etc …”

Synthesis of PS(PEO)3 star block copolymers from a heterotetrafunctional initiator

“…(PS) 2 PEO and (PS) 3 PEO have also been obtained by our group using a specific 1,1 diphenylethylene derivative, implying successive addition/elimination reactions. 4,5 Gnanou and coworkers 6 reported the synthesis of PS(PEO) 2 from a heterodifunctional polystyrene generating two hydroxyl groups for the growth of PEO blocks. Using a partially protected heteromultifunctional initiator, Tsukruk and coworkers 7,8 have recently reported the synthesis of (PS) n (PEO) m like (PS) 2 PEO and (PS) 3 PEO star block copolymers.…”