Mesoscopic study of salt-responsive polymeric micelles: structural inversion mechanisms via sequential addition of inorganic salts

The structural inversion mechanisms of salt-responsive polymeric micelles formed by poly( N -(morpholino)ethyl methacrylate)- b -poly(4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridinium betaine) (PMEMA- b -PSVBP) diblock copolymer in different saline environments were explored from a mesoscopic point of v...

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Bibliographic Details
Published in:Soft matter 2013-01, Vol.9 (24), p.5762-577
Main Authors: Rodrguez-Hidalgo, Mara del Rosario, Soto-Figueroa, Csar, Vicente, Lus
Format: Article
Language:English
Subjects:
Addition polymerization
Aqueous environments
Computer simulation
Copolymers
Inorganic salts
Inversions
Micelles
Simulation
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Summary:The structural inversion mechanisms of salt-responsive polymeric micelles formed by poly( N -(morpholino)ethyl methacrylate)- b -poly(4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridinium betaine) (PMEMA- b -PSVBP) diblock copolymer in different saline environments were explored from a mesoscopic point of view using dissipative particle dynamics (DPD) simulations and coarse-grained models. The results of mesoscopic simulations reveal that the PMEMA- b -PSVBP copolymer can generate stable spherical micelles with a specific structural conformation of the PSVBP-core and the PMEMA-corona in a purely aqueous environment at room temperature. The structural inversion of these polymeric micelles takes place via the sequential addition of inorganic salts (NaBr Na 2 SO 4 , Na 2 SO 4 NaBr and a salt mixture of NaBrNa 2 SO 4 ) in the aqueous environment. Three structural inversion mechanisms were explored by means of mesoscopic simulations: (i) a structural inversion mechanism via micellar dissociation (NaBr Na 2 SO 4 ), (ii) a structural inversion mechanism via simultaneous ascent and immersion of polymeric segments (Na 2 SO 4 NaBr) and (iii) a structural inversion mechanism by means of a purely intermicellar fusion (a salt mixture of NaBrNa 2 SO 4 ). The transitory stages of each structural inversion mechanism are described and analyzed in this document. The structural inversion mechanisms explored in this work are dependent on the concentration and specific order in which the inorganic salts are added into the aqueous environment. The results obtained from these mesoscopic simulations can contribute to elucidating the structural inversion mechanisms of salt-responsive polymeric micelles and are consistent with available experimental outcomes. Structural inversion mechanisms of salt-responsive polymeric micelles via sequential addition of inorganic salts.
ISSN:1744-683X
1744-6848
DOI:10.1039/c3sm50387a