Abiko, Yohei published the artcileThermoresponsive core-shell nanoparticles with cross-linked π-conjugate core based on amphiphilic block copolymers by RAFT polymerization and palladium-catalyzed coupling reactions, Category: alcohols-buliding-blocks, the publication is Polymer (2014), 55(23), 6025-6035, database is CAplus.
Well-defined amphiphilic block copolymers composed of S-vinyl sulfides and N-iso-Pr acrylamide (NIPAM) were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization Thermoresponsive core-shell nanoparticles with crosslinked π-conjugate cores were obtained by in situ crosslinking reactions between 4-bromophenyl moieties in the block copolymers and diboronic acids or a diamine compound in the presence of a palladium catalyst following micelle formation in ethanol/H2O or ethanol. We initially investigated RAFT polymerization of two S-vinyl sulfide derivatives, namely Ph vinyl sulfide (PVS) and 4-bromophenyl vinyl sulfide (BPVS), using a dithiocarbamate-type chain transfer agent (CTA). Then, RAFT polymerization of NIPAM using poly(S-vinyl sulfide) macro-CTAs was conducted to synthesize the amphiphilic block copolymers. Suzuki and Buchwald-Hartwig coupling reactions were found to be effective in the preparation of core-shell nanoparticles with thermoresponsive shells and crosslinked optoelectronic cores. The resulting nanoparticles showed characteristic thermoresponsive properties, as confirmed by turbidity and dynamic light scattering measurements. Stable and uniform core crosslinked nanoparticles were successfully prepared by the in situ palladium-catalyzed coupling reactions, and the optoelectronic and thermoresponsive properties of the nanoparticles could be tuned depending on the nature of the difunctional coupling agents, reaction conditions, and comonomer composition of the block copolymers.
Polymer published new progress about 239075-02-6. 239075-02-6 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Boronate Esters, name is 5,5′-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,2′-bithiophene, and the molecular formula is C20H28B2O4S2, Category: alcohols-buliding-blocks.
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