Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties

Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanica...

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Autores principales: Beata Strachota, Adam Strachota, Sabina Horodecka, Miroslav Šlouf, Jiří Dybal
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Lenguaje:EN
Publicado: Elsevier 2021
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Acceso en línea:https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf9
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spelling oai:doaj.org-article:c066231b15d242d5ae12fe36829c8cf92021-11-28T04:32:35ZMonolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties2238-785410.1016/j.jmrt.2021.11.018https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf92021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421012977https://doaj.org/toc/2238-7854Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanical, and self–recovery properties. The presented materials might be of interest as actuators, drug- or reagent-release systems. They are based on poly(N-isopropylacrylamide) (PNIPAm) physically crosslinked by clay nanoplatelets. This crosslinking lends the gels their unique mechanical properties, PNIPAm a distinct T responsiveness, and the sodium methacrylate (SMA) co-monomer (just 1.5 mol%) a strong pH-responsiveness. The gels display a quasi-one-way and complex response to T- and pH-stimuli: very fast deswelling and slow re-swelling. Extremely fast, as for monolithic gels, is the T induced deswelling at pH2: ca. 10 min are needed for the whole process. This rapid kinetics is attributed to micro-phase-separation which does not destroy mechanical properties. Re-swelling of the gels is always slow: more than 2 days are needed for 35% completion of the process in case of gels shrunken in the neutral bath. In case of gels shrunken in acidic conditions, simple re-swelling is practically blocked (due to the micro-phase-separation): both cooling and pH reversal is needed for ‘un-blocking’ and re-swelling.Beata StrachotaAdam StrachotaSabina HorodeckaMiroslav ŠloufJiří DybalElsevierarticlePoly(N-isopropylacrylamide)ClayNanocompositeHydrogelsTemperature-responsivepH-responsiveMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6079-6097 (2021)
institution DOAJ
collection DOAJ
language EN
topic Poly(N-isopropylacrylamide)
Clay
Nanocomposite
Hydrogels
Temperature-responsive
pH-responsive
Mining engineering. Metallurgy
TN1-997
spellingShingle Poly(N-isopropylacrylamide)
Clay
Nanocomposite
Hydrogels
Temperature-responsive
pH-responsive
Mining engineering. Metallurgy
TN1-997
Beata Strachota
Adam Strachota
Sabina Horodecka
Miroslav Šlouf
Jiří Dybal
Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
description Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanical, and self–recovery properties. The presented materials might be of interest as actuators, drug- or reagent-release systems. They are based on poly(N-isopropylacrylamide) (PNIPAm) physically crosslinked by clay nanoplatelets. This crosslinking lends the gels their unique mechanical properties, PNIPAm a distinct T responsiveness, and the sodium methacrylate (SMA) co-monomer (just 1.5 mol%) a strong pH-responsiveness. The gels display a quasi-one-way and complex response to T- and pH-stimuli: very fast deswelling and slow re-swelling. Extremely fast, as for monolithic gels, is the T induced deswelling at pH2: ca. 10 min are needed for the whole process. This rapid kinetics is attributed to micro-phase-separation which does not destroy mechanical properties. Re-swelling of the gels is always slow: more than 2 days are needed for 35% completion of the process in case of gels shrunken in the neutral bath. In case of gels shrunken in acidic conditions, simple re-swelling is practically blocked (due to the micro-phase-separation): both cooling and pH reversal is needed for ‘un-blocking’ and re-swelling.
format article
author Beata Strachota
Adam Strachota
Sabina Horodecka
Miroslav Šlouf
Jiří Dybal
author_facet Beata Strachota
Adam Strachota
Sabina Horodecka
Miroslav Šlouf
Jiří Dybal
author_sort Beata Strachota
title Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_short Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_full Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_fullStr Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_full_unstemmed Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_sort monolithic nanocomposite hydrogels with fast dual t- and ph- stimuli responsiveness combined with high mechanical properties
publisher Elsevier
publishDate 2021
url https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf9
work_keys_str_mv AT beatastrachota monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
AT adamstrachota monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
AT sabinahorodecka monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
AT miroslavslouf monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
AT jiridybal monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
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