Abstract
A series of star-shaped rod−coil diblock copolymers composed of poly(arylene ether sulfone) (PAES) as a core, and poly[2-(2-methoxyethoxy)ethyl methacrylate-co-oligo(ethylene glycol) methacrylate] [poly(MEO2MA-co-OEGMA)] as a shell was synthesized by combination of chain-growth condensation polymerization (CGCP) and atom transfer radical polymerization (ATRP). In the presence of 4-arm initiator (1), CGCP of 4-fluoro-4′-hydroxydiphenyl sulfone potassium salt (2) via nucleophilic aromatic substitution (SNAr) reaction yielded a well-defined star-shaped polymer with four fluorine end groups (C5−F and C8−F). Transformation of the fluorine groups into ATRP initiating sites produced a macroinitiator having four bromine groups (C5−Br and C8−Br). In the presence of the macroinitiator, random copolymerization of MEO2MA and OEGMA via ATRP formed thermoresponsive shell blocks to produce a desired star-shaped PAES-b-poly(MEO2MA-co-OEGMA) block copolymer with various block lengths. Dynamic light scattering (DLS) of the...
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