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Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
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SYSNO ASEP 0548968 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties Tvůrce(i) Strachota, Beata (UMCH-V) RID
Strachota, Adam (UMCH-V) RID, ORCID
Horodecka, Sabina (UMCH-V) RID, ORCID
Šlouf, Miroslav (UMCH-V) RID, ORCID
Dybal, Jiří (UMCH-V) RID, ORCIDZdroj.dok. Journal of Materials Research and Technology-JMR&T. - : Elsevier - ISSN 2238-7854
Roč. 15, November–December (2021), s. 6079-6097Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. BR - Brazílie Klíč. slova poly(N-isopropylacrylamide) ; clay ; nanocomposite Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA19-04925S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000726796200006 EID SCOPUS 85120349073 DOI 10.1016/j.jmrt.2021.11.018 Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2022 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S2238785421012977?via%3Dihub
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