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Poly(ionic liquid) semi-interpenetrating network multi-responsive hydrogels

Tudor, Alexandru and Florea, Larisa and Gallagher, Simon and Burns, John and Diamond, Dermot (2016) Poly(ionic liquid) semi-interpenetrating network multi-responsive hydrogels. Sensors, 16 (2). pp. 219-235. ISSN 1424-8220

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Herein we describe poly(ionic liquid) hydrogel actuators that are capable of responding to multiple stimuli, namely temperature, ionic strength and white light irradiation. Using two starting materials, a crosslinked poly ionic liquid (PIL) and a linear poly(N-isopropylacrylamide-co-spiropyran-co-acrylic acid), several semi-interpenetrating (sIPN) hydrogels were synthesised. The dimensions of hydrogels discs were measured before and after applying the stimuli, to quantify their response. Samples composed of 100% crosslinked PIL alone showed an average area reduction value of ~53% when the temperature was raised from 20 °C to 70 °C, ~24% when immersed in 1% w/w NaF salt solution and no observable photo-response. In comparison, sIPNs containing 300% w/w linear polymer showed an average area reduction of ~45% when the temperature was raised from 20 °C to 70 °C, ~36% when immersed in 1% NaF w/w salt solution and ~10% after 30 min exposure to white light irradiation, respectively. Moreover, by varying the content of the linear component, fine-control over the photo-, thermo- and salt response, swelling-deswelling rate and mechanical properties of the resulting sIPN was achieved.

Item Type:Article (Published)
Uncontrolled Keywords:polymers; smart materials; hydrogels; poly(ionic liquid)s; LCST; polyelectrolyte effect; stimuli-responsive
Subjects:Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > INSIGHT Centre for Data Analytics
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:MDPI Switzerland
Copyright Information:© 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:OrgBIO FP7 Project
ID Code:21096
Deposited On:23 Feb 2016 14:59 by Alexandru Tudor. Last Modified 19 Jan 2017 10:58

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