2015
DOI: 10.1007/s00396-015-3719-0
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Electrically induced swelling and methylene blue release behaviour of poly (N-isopropylacrylamide-co-acrylamido-2-methylpropyl sulphonic acid) hydrogels

Abstract: Hydrogels composed of poly (ethylene glycol) (PEG)/poly (N-isopropylacrylamide-co-acrylamido-2-methylpropyl sulphonic acid) exhibited electro-responsive behaviour. The swelling properties of hydrogels were influenced by the content of negatively charged ionic groups inside the network structure, cross-linking density, electric field intensity and electrolyte solution. The swelling ratio (SR) increased from 92.4 to 188.08, and normalized swelling ratio (NSR) increased from 2.88 to 3.62 depending on 2-acrylamido… Show more

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Cited by 21 publications
(8 citation statements)
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References 50 publications
(52 reference statements)
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“…The obtained percentage of MB released from the hydrogels ranged from 0.06 to 0.35 %. These results were lower than those obtained with other synthetic hydrogels described in the literature (ranged from 0.44 to 35.22 %) [51]. These results could be explained by the entrapment of the MB molecules within the network structure of the hydrogels and by the strong binding interactions between the MB molecules due to the negative charge of the hydrogels.…”
Section: Accepted Manuscriptcontrasting
confidence: 69%
See 1 more Smart Citation
“…The obtained percentage of MB released from the hydrogels ranged from 0.06 to 0.35 %. These results were lower than those obtained with other synthetic hydrogels described in the literature (ranged from 0.44 to 35.22 %) [51]. These results could be explained by the entrapment of the MB molecules within the network structure of the hydrogels and by the strong binding interactions between the MB molecules due to the negative charge of the hydrogels.…”
Section: Accepted Manuscriptcontrasting
confidence: 69%
“…Synthetic hydrogel composed of poly (ethylene glycol) (PEG)/poly (N-isopropylacrylamide-co-acrylamido-2-methylpropyl sulphonic acid) presented a water intake values around 60 g/g. Moreover, the same hydrogel was able to absorb about 200 g/g when placed within an electric field [51].…”
Section: Accepted Manuscriptmentioning
confidence: 98%
“…As reported in the literature, this effect can be explained as the result of two main phenomena, i.e., ionization of the COOH functionalities and generation of an osmotic pressure between the inner and outer portions of the hydrogel network, due to the re-arrangement of mobile ions moving to the opposite electrodes [ 54 ].…”
Section: Resultsmentioning
confidence: 99%
“…At the same time, the ions in the swelling medium also migrate toward their respective counter electrode moving through hydrogel structure. As a result, the osmotic stress is created along the network resulting in a hydrogel deformation . This effect is obviously not evident in H B samples due to the low conductivity properties of pure Gel, while becoming clearly evident when MWNT_COOH are inserted in the polymer network since they enhance the polarizability of the whole system …”
Section: Resultsmentioning
confidence: 99%