Dielectric relaxation of poly(ester-ether-carbonate) multiblock terpolymers |
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Authors: | Z. Roslaniec T. A. Ezquerra F. J. Baltà-Calleja |
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Affiliation: | (1) Institute of Materials Engineering, Technical University of Szczecin, Al. Piastow 17, 70-310 Szczecin, Poland;(2) Instituto de Estructura de la Materia, C.S.I.C., Serrano 199, 28006 Madrid, Spain |
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Abstract: | The dielectric properties of a series of poly(ester-ether-carbonate) multiblock terpolymers have been investigated as a function of ether and carbonate composition in the frequency range of 103–106 Hz. The degree of polymerization of the samples was determined by viscosimetry measurements. The weight fraction, degree of crystallinity, and melting temperatures were characterized by means of x-ray diffraction and DSC methods. Dielectric behavior has been discussed in terms of Havriliak-Negami formulation. The variation of the dielectric properties with temperature has been associated with two relaxation processes: a) the -relaxation process observed at low temperature, which is associated to local motion of polar groups attached to both the soft and the hard segments, and b) the process assigned to long-range molecular motions above the glass transition temperature. |
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Keywords: | Dielectric relaxation block copolymers termoplastic elastomers |
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