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NMR study of temperature-induced phase separation and polymer-solvent interactions in poly(vinyl methyl ether)/D.sub.2./sub.O/ethanol solutions

  1. 1.
    0040400 - ÚMCH 2007 RIV GB eng J - Journal Article
    Hanyková, L. - Labuta, J. - Spěváček, Jiří
    NMR study of temperature-induced phase separation and polymer-solvent interactions in poly(vinyl methyl ether)/D2O/ethanol solutions.
    [NMR studie teplotou-indukované fázové separace a interakcí polymer-rozpouštědlo v roztocích polyvinylmetyléteru ve směsích D2O/etanol.]
    Polymer. Roč. 47, č. 17 (2006), s. 6107-6116. ISSN 0032-3861. E-ISSN 1873-2291
    Grant - others:GA UK 294/2004/B
    Institutional research plan: CEZ:AV0Z40500505
    Keywords : poly(vinyl methyl ether)/D2O/ethanol solutions * temperature-induced phase separation * 1H and 13C NMR spectroscopy
    Subject RIV: CD - Macromolecular Chemistry
    Impact factor: 2.773, year: 2006

    In this work the temperature-induced phase separation in PVME/D2O/EtOH solutions was investigated by NMR spectroscopy. The measurement of the temperature dependences of PVME integrated intensities permitted to determine the influence of polymer concentration and ethanol content in D2O/EtOH mixture on the phase transition. It was found that the transition region was shifted to lower temperatures with increasing polymer concentration, probably due to the preferred polymer–polymer contacts in more concentrated solutions.

    V této práci byla pomocí NMR spektroskopie zkoumána teplotou-indukovaná fázová separace v roztocích PVME/D2O/EtOH. Byl popsán vliv polymerní koncentrace a obsahu EtOH v D2O/EtOH směsích na fázovou separaci. Měření ukázala přítomnost EtOH molekul dvojího typu: kromě volného EtOH existují též molekuly EtOH vázané v mesoglobulích PVME. S časem je původně vázaný EtOH z globulárních struktur pomalu uvolňován.
    Permanent Link: http://hdl.handle.net/11104/0003603

     
     
Number of the records: 1  

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