Molecular mechanism of gelation with ethylene glycol added to a solution of polyacrylonitrile in dimethylsulfoxide |
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Authors: | V I Vettegren’ N N Machalaba V B Zharov V B Kulik A V Savitskii |
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Institution: | 1.Ioffe Physical Technical Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.All-Russia Research Institute of Synthetic Fiber,Tver,Russia |
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Abstract: | The mechanism of solidifying a solution of polyacrylonitrile (PAN) in dimethylsulfoxide (DMSO) into which ethylene glycol
is added is studied by the method of Raman spectroscopy. In the absence of ethylene glycol, DMSO molecules produce dipole-dipole
bonds to PAN molecules. Upon adding ethylene glycol, DMSO molecules form hydrogen bonds with it and a line at 1000 cm−1 appears in the Raman spectrum, which is assigned to the valence vibrations of S=O bonds involved in the hydrogen bonds. After
DMSO is removed, ethylene glycol molecules produce hydrogen bonds with two neighboring PAN molecules, giving rise to a band
at 2264 cm−1, which is assigned to the valence vibrations of C≡N bonds involved in these hydrogen bonds. A high-viscosity gel consisting
of PAN molecules arises in which these molecules are bonded to each other through ethylene glycol molecules. |
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