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Issue 10, 2015
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Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions

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Abstract

A poly[(2-ethyl-2-oxazoline)-ran-(2-nonyl-2-oxazoline)] random copolymer was synthesized and its thermoresponsive behavior in aqueous solution modulated by the addition of different supramolecular host molecules. The macrocycles formed inclusion complexes with the nonyl aliphatic side-chains present in the copolymer, increasing its cloud point temperature. The extent of this temperature shift was found to depend on the cavitand concentration and on the strength of the host–guest complexation. The cloud point temperature could be tuned in an unprecedented wide range of 30 K by supramolecular interactions. Since the temperature-induced breakage of the inclusion complexes constitutes the driving force for the copolymer phase transition, the shift in cloud point temperature could be utilized to estimate the association constant of the nonyl side chains with the cavitands.

Graphical abstract: Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions

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Article information


Submitted
23 Dec 2014
Accepted
15 Jan 2015
First published
15 Jan 2015

This article is Open Access

Org. Biomol. Chem., 2015,13, 3048-3057
Article type
Paper
Author version available

Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions

V. R. de la Rosa, W. M. Nau and R. Hoogenboom, Org. Biomol. Chem., 2015, 13, 3048
DOI: 10.1039/C4OB02654C

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