Random ethyl acrylate-sulphonatopropylbetaine copolymers. II: Dynamic mechanical properties

The dynamic mechanical properties of ethyl acrylate--sulphonatopropylbetaine copolymers (zwitterionomers) and their stoichiometric blends with lithium perchlorate were examined as a function of temperature and frequency from the glassy to the melt zones. By comparing with the behaviour of classical...

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Bibliographic Details
Published in:Polymer (Guilford) 1989-04, Vol.30 (4), p.654-661
Main Authors: BAZUIN, C. G, ZHENG, Y. L, MULLER, R, GALIN, J. C
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Ionization properties
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:The dynamic mechanical properties of ethyl acrylate--sulphonatopropylbetaine copolymers (zwitterionomers) and their stoichiometric blends with lithium perchlorate were examined as a function of temperature and frequency from the glassy to the melt zones. By comparing with the behaviour of classical microphase-separated ionomers, it could be concluded that the zwitterionomers, both with and without added salt, display the characteristics of the microphase separation, thus supporting previous small angle X-ray studies. The slope of the modulus curves in the glass transition region decreases with increasing zwitterion content (up to approx = 10 mol.%), the loss tangent intensity decreases and the rubbery plateau modulus increases. The addition of the salt affects the glass transition zone relatively little, but significantly extends the range of the rubbery zone, indicating that the electrostatic interactions in the zwitterionic phase are stable to higher temperatures or lower frequencies than in the absence of salt. Furthermore, a second dispersion region is clearly evident. Time--temperature superposition is applicable to all the copolymers, with and without salt, in the range of conditions studied. 25 ref.--AA
ISSN:0032-3861
1873-2291