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Hyperbranched polyglycerol derivatives exhibiting normal or abnormal thermoresponsive behaviours in water: facile preparation and investigation by turbidimetry and fluorescence techniques

Abstract

Polymer with an abnormal thermoresponsive behaviour that increasing the polymer concentration in water leads to the increase of phase transition temperature is few and no plausible strategy has been addressed to prepare such polymer. For illuminating a feasible common strategy to prepare polymers with abnormal thermoresponsive behaviour, in this work, we systematically prepared a series of hyperbranched polyglycerol (HPG) derivatives through the facile esterification reaction between HPG and aliphatic acid having a different carbon number (X). Turbidimetry measurements demonstrated that only when HPGs conjugated with aliphatic units of X≤8, could thermoresponsive HPGs be obtained. The conjugation of HPG with aliphatic unit of X≤4 resulted in the thermoresponsive HPGs with a normal thermoresponsive behaviour. For the preparation of thermoresponsive HPGs with an abnormal thermoresponsive behaviour, X should be controlled in the range of 5—8. Fluorescence measurements with nile red as fluorescence probe demonstrated that the existence of strong hydrophobic interaction is a key factor to ensure polymer to exhibit an abnormal thermoresponsive behaviour in water. Moreover, turbidimetry and fluorescence techniques are complementary for measuring the phase transition behaviour and are respectively satisfied with a different polymer concentration region.

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Publication details

The article was received on 15 Sep 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7SM01862B
Citation: Soft Matter, 2017, Accepted Manuscript
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    Hyperbranched polyglycerol derivatives exhibiting normal or abnormal thermoresponsive behaviours in water: facile preparation and investigation by turbidimetry and fluorescence techniques

    Y. Zhang, R. Wang, H. Liu and Y. Chen, Soft Matter, 2017, Accepted Manuscript , DOI: 10.1039/C7SM01862B

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