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Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels

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    SYSNO ASEP0469851
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleSynthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels
    Author(s) Depa, Katarzyna (UMCH-V)
    Strachota, Adam (UMCH-V) RID
    Šlouf, Miroslav (UMCH-V) RID
    Brus, Jiří (UMCH-V) RID
    Cimrová, Věra (UMCH-V) RID
    Source TitleSensors and Actuators B - Chemical. - : Elsevier - ISSN 0925-4005
    Roč. 244, June (2017), s. 616-634
    Number of pages19 s.
    Languageeng - English
    CountryCH - Switzerland
    KeywordsPNIPAm hydrogel ; polyaniline ; silica
    Subject RIVCD - Macromolecular Chemistry
    OBOR OECDPolymer science
    R&D ProjectsLD14010 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    GA13-26542S GA ČR - Czech Science Foundation (CSF)
    Institutional supportUMCH-V - RVO:61389013
    UT WOS000395963300071
    EID SCOPUS85009083411
    DOI10.1016/j.snb.2016.12.121
    AnnotationTemperature-responsive and electrically conductive doubly filled highly porous poly(N-isopropylacrylamide)/SiO2/polyaniline hydrogels were successfully prepared. They contained 2.5–44 wt.% PANI in dry gel and 6 wt.% SiO2 in the PANI-free part of the dry gel. These materials are of interest as potential actuators (generating movement or pressure change), because of their ultra-fast volume changes, which can be triggered by ohmic- or by induction heating (remote triggering in the latter case), as well as in the function of electrical switches controlled by heating/cooling (shrinking and expanding conductive element). The prepared doubly filled porous gels display reversible and symmetrical response to temperature jumps as fast as 6 s for 75% of the swelling change, and conductivities as high as 74 000 mu S/cm. After testing several synthesis approaches, an efficient two-step route was developed, consisting in the impregnation of porous PNIPAm/SiO2 precursor gels with PANI precursors, which led to a highly selective PANI incorporation into the pore walls (as sub-micrometre-sized irregular and branched filaments). The incorporation of the ‘first filler’, nano-SiO2, was crucial in the developed synthesis, which required an ultra-fast T-responsivity of the PANI-free precursor gel. In order to achieve optimal conductivities, the PANI filler was reduced to the emeraldine form using SnCl2. Conductivity measurements indicated, that PANI percolation is approached near 20 wt.%, and achieved between 20 and 44 wt.%. At such loadings, PANI also acts as a distinct mechanical reinforcement in the gels.
    WorkplaceInstitute of Macromolecular Chemistry
    ContactEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Year of Publishing2017
Number of the records: 1