Journal
MACROMOLECULES
Volume 50, Issue 20, Pages 8185-8191Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b01650
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Funding
- Korea Agency for Infrastructure Technology Advancement (KAIA) grant - Ministry of Land, Infrastructure and Transport [17IFIP-B116951-02]
- GIST Research Institute (GRI)
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We report redox-responsive aggregation-disaggregation behaviors of a multiblock rod-coil polymer synthesized via a cohdensation of diaminoheptaaniline and bis-succinimidyl ester terminated oligoethylene glycol. The emeraldine base state of these multiblock polymers formed spherical nanoparticles in water, whereas the aggregates disassembled upon being reduced to the leucoemer-aldine base state. The redox-responsiveness was accounted for by the formation of a compound micelle consisting of three-dimensionally interconnected, smaller puck-shaped rod-coil micellar aggregates. The rodlike heptaaniline blocks in the emeraldine base state packed parallel to each other and compactly via intermolecular hydrogen bonding to form the puck-shaped aggregates, which were bridged by oligoethylene glycol coils emanating from their two faces. It was demonstrated that the oxidized state of the rod-coil network within the compound micelles could entrap guest molecules, and reducing this network could release them. The rod-coil compound micelles with longer boil bridges exhibited a greater extent of entrapment and a higher loading efficiency.
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