期刊
SENSORS
卷 16, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/s16020219
关键词
polyelectrolyte effect; LCST; stimuli-responsive; poly(ionic liquid)s; hydrogels; smart materials
资金
- Marie Curie Initial Training Network - EC FP7 People Programme OrgBIO (Marie Curie ITN) [GA607896]
- Science Foundation Ireland (SFI) under the Insight Centre for Data Analytics initiative [SFI/12/RC/2289]
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 degrees C to 70 degrees 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 degrees C to 70 degrees 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.
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