Počet záznamů: 1  

Two-Step Syneretic Formation of Highly Porous Morphology During Copolymerization of Hydroxyethyl Methacrylate and Ethylene Glycol Dimethylacrylate.

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    SYSNO ASEP0472515
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevTwo-Step Syneretic Formation of Highly Porous Morphology During Copolymerization of Hydroxyethyl Methacrylate and Ethylene Glycol Dimethylacrylate.
    Tvůrce(i) Paljevac, M. (SI)
    Krajnc, P. (SI)
    Hanková, Libuše (UCHP-M) RID
    Holub, Ladislav (UCHP-M) RID
    Le Droumaguet, B. (FR)
    Grande, D. (FR)
    Jeřábek, Karel (UCHP-M) RID, ORCID, SAI
    Zdroj.dok.Materials Today Communications - ISSN 2352-4928
    Roč. 7, JUN (2016), s. 16-21
    Poč.str.6 s.
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovacrystal morphology ; phase separation ; porosity
    Vědní obor RIVCC - Organická chemie
    Institucionální podporaUCHP-M - RVO:67985858
    UT WOS000379932400003
    EID SCOPUS84960435311
    DOI10.1016/j.mtcomm.2016.02.004
    AnotaceLarge pore volume and pore size ranges were achieved in 2-hydroxyethyl methacrylate (HEMA)/ethylene glycol dimethylacrylate (EGDMA) copolymers prepared by microsyneretic phase separation in free-radical copolymerization of comonomers in the presence of a tenfold volume of porogenic solvents. A mixture of methanol, i.e. good swelling solvent for poly(HEMA), and tetrahydrofuran, i.e. good swelling solvent for poly(EGDMA), was used as porogens. The morphology of the as-prepared copolymers was assessed in their native, expanded state using inverse steric exclusion chromatography (ISEC), which enabled to get a much better insight into the mechanism of pore formation than a conventional approach based on the evaluation of the morphology of dried materials. Two porosity levels with distinct pore volumes and sizes could be distinguished depending on the crosslinking degree and the MeOHITHE ratio. Their formation could be explained by a two-step syneretic phase separation during the free-radical copolymerization, namely x-induced syneresis for the larger pore sizes and v-induced syneresis for the smaller pore sizes Due to their high crosslink density, the porosity of the resulting polymers do not rely on swelling, and it was virtually independent on the nature of surrounding solvent.
    PracovištěÚstav chemických procesů
    KontaktEva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
    Rok sběru2017
Počet záznamů: 1