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Swelling and Shrinking Properties of Thermo-Responsive Polymeric Ionic Liquid Hydrogels with Embedded Linear pNIPAAM

Authors: 

Simon Gallagher, Larisa Florea, Kevin Fraser, Dermot Diamond

Publication Type: 
Refereed Original Article
Abstract: 
In this study, varying concentrations of linear pNIPAAM have been incorporated for the first time into a thermo-responsive polymeric ionic liquid (PIL) hydrogel, namely tributyl-hexyl phosphonium 3-sulfopropylacrylate (P-SPA), to produce semi-interpenetrating polymer networks. The thermal properties of the resulting hydrogels have been investigated along with their thermo-induced shrinking and reswelling capabilities. The semi-interpenetrating networks (IPN) hydrogels were found to have improved shrinking and reswelling properties compared with their PIL counterpart. At elevated temperatures (50–80 °C), it was found that the semi-IPN with the highest concentration of hydrophobic pNIPAAM exhibited the highest shrinking percentage of ~40% compared to the conventional P-SPA, (27%). This trend was also found to occur for the reswelling measurements, with semi-IPN hydrogels producing the highest reswelling percentage of ~67%, with respect to its contracted state. This was attributed to an increase in water affinity due to the presence of hydrophilic pNIPAAM. Moreover, the presence of linear pNIPAAM in the polymer matrix leads to improved shrinking and reswelling response compared to the equivalent PIL.
Digital Object Identifer (DOI): 
10.3390/ijms15045337
Publication Status: 
Published
Date Accepted for Publication: 
Monday, 24 March, 2014
Publication Date: 
27/03/2014
Journal: 
International journal Of Molecular Sciences
Volume: 
15
Issue: 
4
Pages: 
5337 - 5349
Research Group: 
Institution: 
Dublin City University (DCU)
Open access repository: 
Yes