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Integration of molecular machines into supramolecular materials: actuation between equilibrium polymers and crystal-like gels

Abstract

In this article, the dynamic structure of complex supramolecular polymers composed of bistable [c2]daisy chain rotaxanes as molecular machines that are linked by ureidopyrimidinones (Upy) as recognition moieties is studied. pH actuation of the integrated mechanically active rotaxanes controls the contraction/extension of the polymer chains as well as their physical reticulation. Small-angle neutron and X-ray scattering are used to study in depth the nanostructure of the contracted and extended polymer aggregates in toluene solution. The supramolecular polymers made of contracted nanomachines are found to be equilibrium polymers with a mass that is concentration dependent in dilute and semidilute regimes. Surprisingly, the extended polymers form a gel network with a crystal-like internal structure that is independent of the concentration and reminiscent of a pearl-necklace network.

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Publication details

The article was received on 14 Jun 2017, accepted on 06 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR04251E
Citation: Nanoscale, 2017, Accepted Manuscript
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    Integration of molecular machines into supramolecular materials: actuation between equilibrium polymers and crystal-like gels

    G. Mariani, A. Goujon, E. Moulin, M. Rawiso, N. GIUSEPPONE and E. Buhler, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04251E

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