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Issue 18, 2015
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Interface-enforced complexation between copolymer blocks

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Binary diblock copolymers and corresponding ternary miktoarm stars are studied at oil–water interfaces. All polymers contain oil-soluble poly(propylene oxide) PPO, water-soluble poly(dimethylaminoethyl methacrylate) PDMAEMA and/or poly(ethylene oxide) PEO. The features of their Langmuir compression isotherms are well related to the ones of the corresponding homopolymers. Within the Langmuir-trough, PEO-b-PPO acts as the most effective amphiphile compared to the other PPO-containing copolymers. In contrast, the compression isotherms show a complexation of PPO and PDMAEMA for PPO-b-PDMAEMA and the star, reducing their overall amphiphilicity. Such complex formation between the blocks of PPO-b-PDMAEMA is prevented in bulk water but facilitated at the interface. The weakly-interacting blocks of PPO-b-PDMAEMA form a complex due to their enhanced proximity in such confined environments. Scanning force microscopy and Monte Carlo simulations with varying confinement support our results, which are regarded as compliant with the mathematical random walk theorem by Pólya. Finally, the results are expected to be of relevance for e.g. emulsion formulation and macromolecular engineering.

Graphical abstract: Interface-enforced complexation between copolymer blocks

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Publication details

The article was received on 28 Jan 2015, accepted on 17 Mar 2015 and first published on 17 Mar 2015

Article type: Paper
DOI: 10.1039/C5SM00242G
Soft Matter, 2015,11, 3559-3565

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    Interface-enforced complexation between copolymer blocks

    A. A. Steinschulte, W. Xu, F. Draber, P. Hebbeker, A. Jung, D. Bogdanovski, S. Schneider, V. V. Tsukruk and F. A. Plamper, Soft Matter, 2015, 11, 3559
    DOI: 10.1039/C5SM00242G

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