Dielectric Study of Pure Polymer and Mixed Monomer-Polymer Single Crystals of pTS Diacetylene: a Comparison with Neutron Scattering Results |
| S. Longevile, J. Even, M. Bertault Groupe Matiere Condensée et Matériaux, URA au C.N.R.S. 804, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France H.A. Kołodziej Institute of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland and J. Sworakowski Institute of Physical and Theoretical Chemistry, Technical University of Wrocław, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland |
| Received: April 25, 1995 |
| Dedicated to Professors Krzyszof Pigoń, Józef W. Rohleder and Zdzisław Ruziewicz on the occasion of their 70th birthdays |
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| Temperature and frequency dependences of the electric permittivity in mixed monomer-polymer single crystals of the diacetylene pTS (2,4-hexadiynylene bis(p-toluenesulphonate)) are reported. The dependences were determined in the temperature range 100-250 K, and in the frequency range 100 Hz - 1 MHz. Two types of single crystals were studied: nearly-fully polymerized ones, and those containing ca. 20% of polymer in the monomer matrix. The dynamics is characterized by a high-frequency response (v ≫ 3 GHz) which corresponds to the soft mode analysed previously by the Raman and neutron inelastic scatterings. At low frequencies (v ≤ 1 kHz), another component is observed, its dielectric intensity peaking around the transition temperature in the fully polymerized crystals. The results are consistent with the results obtained from NMR and neutron scattering experiments. |
| DOI: 10.12693/APhysPolA.88.359 PACS numbers: 64.70.Kb, 77.84.Jd, 61.12.-q |