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  • Responsive poly(acrylic acid) and poly(N-isopropylacrylamide) monoliths by high internal phase emulsion (HIPE) templating
    Kovačič, Sebastijan ; Jeřábek, Karel, kemija ; Krajnc, Peter, 1970-
    High internal phase emulsions are used to prepare cross-linked polystyrene/poly(acrylic acid) (PS/PAA) and polystyrene/poly(N-isopropyl acrylamide) (PS/PNIPAM) monoliths with a polystyrene scaffold ... and acrylic domains inside the cavities of the scaffold. Acrylic acid or NIPAM are included in the aqueous phase of a high internal phase emulsion, while the oil phase includes styrene. Polymerisation of such high internal phase emulsions (HIPEs) yields macroporous polymers (polyHIPEs) with a scaffold composed of cross-linked polystyrene and domains of cross-linked poly(acrylic acid) or cross-linked poly(NIPAM) positioned inside the cavities of the polystyrene skeleton. Monolithic discs are shaped from PS/PAA and PS/PNIPAM polyHIPEs in order to study the dependence of flow resistance through the discs in relation to pH or temperature changes. The amount of acrylic component in the aqueous phase and the degree of cross-linking prove to be the most influential on the pressure drops of columns with monolithic discs. The temperature influences the resistance properties in the case of PS/PNIPAM material. Inverse size exclusion chromatography experiments confirm the pH dependent structure of the polymeric monoliths.
    Source: Macromolecular chemistry and physics. - ISSN 1022-1352 (Vol. 212, iss. 19, 2011, str. 2151-2158)
    Type of material - article, component part
    Publish date - 2011
    Language - english
    COBISS.SI-ID - 15235350
    DOI

source: Macromolecular chemistry and physics. - ISSN 1022-1352 (Vol. 212, iss. 19, 2011, str. 2151-2158)
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