Tuneable swelling of thermo- and pH-responsive copolymer films

Martin Kaufmann; Yunfei Jia; Lars Renner; Smrati Gupta; Dirk Kuckling; Carsten Werner; Tilo Pompe

doi:10.1039/B918586K

Tuneable swelling of thermo- and pH-responsive copolymer films

Martin Kaufmann,^a^b Yunfei Jia,^a^b Lars Renner,^a^b Smrati Gupta,^b Dirk Kuckling,^c Carsten Werner^a^b^d and Tilo Pompe*^a^b

Author affiliations

* Corresponding authors

^a Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, Dresden, Germany
E-mail: pompe-tilo@ipfdd.de
Fax: +49 351 4658 533
Tel: +49 351 4658 274

^b Max Bergmann Center of Biomaterials Dresden, Dresden, Germany

^c Department Chemie, Anorganische Chemie, Universität Paderborn, Warburger Str. 100, Paderborn, Germany

^d Center for Regenerative Therapies Dresden (CRTD), Dresden, Germany

Abstract

We report on thermo- and pH-responsive copolymer films consisting of N-isopropylacrylamide (NIPAAm) and different carboxyalkylacrylamides exhibiting switchable swelling states over a wide range of temperatures and pH-values. The copolymers were covalently grafted as brush-like films onto solid substrates. Analysis by quartz crystal microbalance with dissipation monitoring revealed the phase transition behaviour to be sensitively controlled by the balance of polar and non-polar interactions, which could be dissected into the local level of comonomer structure as well as the more global level of copolymer chain composition. Remarkably, the phase transition was determined to be in general lower than in solution, which originated from the higher local polymer concentration of the swollen surface-grafted copolymer layer as explained by the general phase behaviour based on classical theory of polymers in solutions. The different swelling profiles of the environmentally responsive copolymer films are expected to offer valuable options for the design of switchable interfaces as, for instance, applicable for the modulation of model biosystems.

Supplementary files

Publication details

The article was received on 08 Sep 2009, accepted on 26 Nov 2009 and first published on 11 Jan 2010

Article type: Paper

DOI: 10.1039/B918586K

Citation: Soft Matter, 2010,6, 937-944

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Tuneable swelling of thermo- and pH-responsive copolymer films

M. Kaufmann, Y. Jia, L. Renner, S. Gupta, D. Kuckling, C. Werner and T. Pompe, Soft Matter, 2010, 6, 937
DOI: 10.1039/B918586K
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Soft Matter

Tuneable swelling of thermo- and pH-responsive copolymer films

Abstract

Supplementary files

Publication details

Tuneable swelling of thermo- and pH-responsive copolymer films

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