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Local Nanoscopic Heterogeneities in Thermoresponsive Dendronized Polymers

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Assessing the Functional Structure of Molecular Transporters by EPR Spectroscopy

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

The thermal transition of thermoresponsive dendronized polymers is characterized on a molecular scale by continuous wave EPR spectroscopy. It is found to be accompanied by dynamic structural heterogeneities on the nanoscale, which trigger the aggregation of single polymer chains into mesoglobules. While macroscopically a sharp phase transition, this study reveals that the dehydration of the polymer chains proceeds over a temperature interval of at least 30 K and is a case of a molecularly controlled non-equilibrium state. While the aggregation temperature mainly depends on the periphery of the dendrons, the dehydration of the mesoglobule is governed by the hydrophobicity of the dendritic core. Heating rate dependent changes were assigned to the formation of a dense polymeric layer at the periphery of the mesoglobule, which prohibits the release of incorporated water.

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  1. Max Planck Institute for Polymer Research, Mainz, Germany

    Matthias J. N. Junk

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Correspondence to Matthias J. N. Junk .

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Junk, M.J. (2012). Local Nanoscopic Heterogeneities in Thermoresponsive Dendronized Polymers. In: Assessing the Functional Structure of Molecular Transporters by EPR Spectroscopy. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25135-1_7

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