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pH-induced shrinking and swelling of hydrogels based on copolymers of acrylic acid and acrylamide

Dunne, Aishling and Mac Ardle, Siobhán and Florea, Larisa and Diamond, Dermot (2015) pH-induced shrinking and swelling of hydrogels based on copolymers of acrylic acid and acrylamide. In: NanoNet conference 2015, 21-22 Oct 2015, University of Limerick, Limerick, Ireland.

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Abstract

Hydrogels are three-dimensional polymeric networks that can absorb and retain large quantities of water in relation to their physical size. By incorporating stimuli-responsive units into the gel structure, hydrogel materials can be actuated by external stimuli such as photo, thermal, electro and chemical (e.g. pH). In this paper, we demonstrate that the size and volume of a pH sensitive hydrogel based on acrylic acid (AA) and acrylamide (Am) can change when exposed to different pH environments. The pH responsive hydrogels that were developed used copolymers of AA and Am in different molar ratios 30:70, 50:50 and 70:30, respectively. At a pH value above the pKa of AA (pH > 4.5) the AA dissociates to the more hydrophilic acrylate anion (A-) triggering swelling of the hydrogel. In contrast, at pH < 4.5, the hydrogel contracts due to the formation of the less hydrophilic AA form in the polymer backbone, which triggers the release of water from the gel causing it to physically contract. The hydrogel samples were photo-polymerised using a photo-mask with 1mm diameter circles exposed. Each of the hydrogel samples was placed in pH solutions varying from pH 1-14. The hydrogels with 50:50 molar ratio of Am:AA in the polymer backbone produced hydrogels with the highest relative pH response when compared with the other molar ratios, having a large diameter increase from pH 2 (~0.57mm) to pH 10 (~3.27mm). Successive changes of the solution pH showed that the pH-induced actuation is a reversible process with no detectable hysteresis.

Item Type:Conference or Workshop Item (Poster)
Event Type:Conference
Refereed:No
Uncontrolled Keywords:Hydrogels; Acrylic Acid; Acrylamide; pH-responsive
Subjects:Physical Sciences > Chemical detectors
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
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Insight Centre for Data analytics
ID Code:20886
Deposited On:29 Oct 2015 12:22 by Aishling Dunne. Last Modified 23 Feb 2017 14:03

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