Preparation of polymeric vesicles through ultrasonic treatment of poly(styrene‐block‐2‐vinylpyridine) micelles under alkaline conditions

Abstract

An approach for the preparation of block copolymer vesicles through ultrasonic treatment of polystyrene‐block‐poly(2‐vinyl pyridine) (PS‐b‐P2VP) micelles under alkaline conditions is reported. PS‐b‐P2VP block copolymers in toluene, a selective solvent for PS, form spherical micelles. If a small amount of NaOH solution is added to the micelles solution during ultrasonic treatment, organic‐inorganic Janus‐like particles composed of the PS‐b‐P2VP block copolymers and NaOH are generated. After removal of NaOH, block copolymer vesicles are obtained. A possible mechanism for the morphological transition from spherical micelles to vesicles or Janus‐like particles is discussed. If the block copolymer micelles contain inorganic precursors, such as FeCl3, hybrid vesicles are formed, which may be useful as biological and chemical sensors or nanostructured templates. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 953–959

Fabrication of strawberry-like Au@CeO2 nanoparticles with enhanced catalytic activity by assembly of block copolymer composite micelles

“…During the process of reaction, the aggregate of PS-b-P2VP micelles to form larger spheres play an important role. In our previous work, 28 we observed that when addition of NaOH to the PS-b-P2VP micelle solution during ultrasonic treatment, spherical PS-b-P2VP micelles collide and aggregate into organic-inorganic Janus-like particles composed of the block copolymers and NaOH. Aer removal of NaOH, block copolymer vesicles are obtained.…”

Controllable self‐assembly of polystyrene‐block‐poly(2‐vinylpyridine)

“…Because the two segments of PS‐ b ‐P2VP have different solubilities, the self‐assembled morphology can be controlled by regulating the solvent species. Liu et al . prepared Janus‐like structures by mixing a solution of PS‐ b ‐P2VP (55k‐ b ‐50k) in toluene with a solution of sodium hydroxide in tetrahydrofuran (THF)/H 2 O under ultrasonic treatment.…”

“…Micrographs of the PS‐ b ‐P2VP nanoparticle morphologies prepared by regulating the solvent ratio: (a) Janus‐like structures (TEM); (b) onion‐like layered structures (SEM); (c) labyrinth structures (AFM) …”

“…Recently, PS‐ b ‐P2VP has been applied to prepare various ordered structures such as double continuous structure, vesicle structure, labyrinth structure, nano‐porous structure and onion‐like structure . Moreover, because the pyridyl groups of the P2VP block prefer to adsorb inorganic chemicals, PS‐ b ‐P2VP is a good template for loading inorganic chemicals to prepare nano‐scale complex materials …”

Synthesis of multifunctional poly(1-pyrenemethyl methacrylate)-b-poly(N-isopropylacrylamide)-b-poly(N-methylolacrylamide)s and their electrospun nanofibers for metal ion sensory applications

“…[14][15][16] Besides, block copolymers can render self-assembly nanostructures, which provide a versatility for designing sensor devices. [17][18][19][20][21][22] For example, Balamurugan et al reported that poly(thiophene-g-N-isopropylacrylamide) with a fluorescent polythiophene main chain and thermoresponsive poly(Nisopropylacrylamide) (PNIPAAm) side chains showed tunable optical properties along with PNIPAAm undergoing a reversible phase transition between 28 and 35 °C. 23 We have reported previously that a rod-coil polyfluorene-block-poly (2-(dimethylamino)ethyl methacrylate) in aqueous solution showed thermo-and pH-dependent photoluminescence (PL) behaviours, in which the polyfluorene (PF) block had been used as an on/off fluorescence indicator.…”