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Issue 4, 2018
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Temperature responsive poly(phosphonate) copolymers: from single chains to macroscopic coacervates

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Abstract

We present the first series of random poly(ethylene alkyl phosphonate) copolymers with either high solubility in water or a finely tunable hydrophilic-to-hydrophobic phase transition upon heating (“LCST”). Polymerization via the organocatalytic anionic ring-opening polymerization provided high control over molecular weight (up to 23 000 g mol−1) and copolymer composition, and resulted in narrow molecular weight distribution (Đ < 1.3). Polymers of molecular weights up to 23 000 g mol−1 were obtained. The phase separation temperature was precisely adjusted in a range from 55 °C to 6 °C in water, depending on the copolymer composition. The phase transition mechanism was thoroughly investigated at different length scales via electron paramagnetic resonance spectroscopy (EPR), dynamic light scattering (DLS), UV-Vis spectroscopy and confocal laser scanning microscopy (cLSM), proving the step-wise formation of aggregates close to the cloud point temperature up to macroscopic coacervates.

Graphical abstract: Temperature responsive poly(phosphonate) copolymers: from single chains to macroscopic coacervates

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Supplementary files

Article information


Submitted
28 Oct 2017
Accepted
18 Dec 2017
First published
19 Dec 2017

This article is Open Access

Polym. Chem., 2018,9, 490-498
Article type
Paper

Temperature responsive poly(phosphonate) copolymers: from single chains to macroscopic coacervates

T. Wolf, J. Hunold, J. Simon, C. Rosenauer, D. Hinderberger and F. R. Wurm, Polym. Chem., 2018, 9, 490
DOI: 10.1039/C7PY01811H

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