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Structural Transformation of Diblock Copolymer/Homopolymer Assembles by Tuning Cylindrical Confinement and Interfacial Interactions.

08:00 EDT 22nd October 2015 | BioPortfolio

Summary of "Structural Transformation of Diblock Copolymer/Homopolymer Assembles by Tuning Cylindrical Confinement and Interfacial Interactions."

In this study, we report the controllable structural transformation of block copolymer/homopolymer binary blends in cylindrical nanopores. Polystyrene-b-poly(4-vinyl pyridine)/homopolystyrene (SVP/hPS) nanorods (NRs) can be fabricated by pouring the polymers into anodic aluminum oxide (AAO) channel, and isolated by selective removal of the AAO membrane. In this two dimensional (2D) confinement, SVP self-assemble into NRs with concentric lamellar structure, and the internal structure can be tailored with the addition of hPS. We show that weight fraction and molecular weight of hPS, and the diameter of the channels can significantly affect the internal structure of the NRs. Moreover, mesoporous materials with tunable pore shape, size, and packing style can be prepared by selective solvent swelling of the structured NRs. In addition, these NRs can transform into spherical structures through solvent-absorption annealing, triggering the conversion from 2D to 3D confinement. More importantly, the transformation dynamics can be tuned by varying the preference property of surfactant to the polymers. It is proved that the shape and internal structure of the polymer particles are dominated by the interfacial interactions governed by the surfactants.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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