Podrobnosti záznamu

Název
    Magnetic hollow poly(N-isopropylacrylamide-co-N,N'-methylenebisacrylamide-co-glycidyl acrylate) particles prepared by inverse emulsion polymerization
Autor
    Horák, Daniel
    Kovářová, Jana
    Macková, Hana
    Petrovský, Eduard
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Colloid and Polymer Science
Svazek/č.
    Roč. 291, č. 1
Strany
    s. 205-213
Rok
    2013
Poznámky
    Projekt: FP-7 DiaTools No. 259796, European Commission, XE3cav_un_auth*0301276
    Projekt: GAP503/10/0664, GA ČR3cav_un_auth*0263496
    Projekt: KAN401220801, GA AV ČR, CZ3cav_un_auth*0240073
    Rozsah: 9 s.
    Výzkumný záměr: CEZ:AV0Z30120515
    Výzkumný záměr: CEZ:AV0Z40500505
Předmětová kategorie
    magnetic
    particles
    poly(N-isopropylacrylamide)
Klíčové slovo
    Acrylate
    Emulsion
    Hollow
    Inverse
    Magnetic
    Particles
    Polymerization
    Poly(N-isopropylacrylamide-co-N,N'-methylenebisacrylamide-co-glycidyl
    Prepared
Abstrakt (anglicky)
   Inverse emulsion copolymerization of N-isopropylacrylamide, N,N′-methylenebisacrylamide and glycidyl acrylate (GA) was investigated in paraffin oil in the presence of γ-Fe2O3 nanoparticles dispersed in a water/glycerol mixture. The resulting magnetic polymer particles were characterized regarding the morphology, size, polydispersity, iron content, and the temperature-dependent phase transition using optical microscopy, transmission electron microscopy, scanning electron microscopy, atomic absorption spectroscopy, and differential scanning calorimetry. Magnetic properties were examined using hysteresis loop measurements and by analyzing the magnetic susceptibility with respect to temperature. We have also investigated the influence of the concentration of γ-Fe2O3 and GA in monomers on properties of the particles (morphology, size, and presence of oxirane groups).
   The particles possessed a hollow structure as a result of phase separation between water/glycerol hydrophilic solvents in the polymerization feed and the forming polymer. Depending on the concentration of γ-Fe2O3 in the monomer phase, the magnetic hollow particles contained 5-24 wt% iron. In water, the particles gradually collapsed when the temperature was raised to 40 °C because the elevated temperature weakened hydration and the PNIPAAm chains gradually became more hydrophobic.
Přispěvatel
    AV ČR Brno, Geofyzikální ústav
Kód přispěvatele
    AV ČR, GFÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014