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Study of local and cooperative molecular movements in Poly(ethylene oxide) — Potassium thiocyanate complexes by mechanical measurements

  • A. Bartolotta
  • G. Di Marco
  • G. Carini
  • G. Tripodo
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Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 84)

Abstract

The mechanical characteristics (internal friction and dynamic elastic modulus) of polyethylene oxide (PEO)-KSCN complexes are studied as a function of temperature (120–300 K) and frequency. The mechanical spectrum is characterized by the presence of the γ-relaxation at low temperatures and of the a a -relaxation at high temperatures, respectively arising from local and cooperative molecular motions. The salt addition modifies the γ-relaxation region, which consists of a single loss peak in pure PEO, and gives rise to two close low temperature relaxations. The behavior of the relaxation strengths with the salt content permits to assign them to local motions within the amorphous regions of the polymer. — The a a -relaxation shifts to higher temperatures by increasing the KSCN content. Moreover, an enhancement of the amorphous phase of the polymer has been revealed in the low concentration region.

Key words

Mechanical measurements polymeric electrolytes 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • A. Bartolotta
    • 1
  • G. Di Marco
    • 1
  • G. Carini
    • 2
    • 1
  • G. Tripodo
    • 2
    • 1
  1. 1.Istituto di Tecniche Spettroscopiche del CNRMessinaItaly
  2. 2.Dip. di Fisica Gen.Universita’ degli Studi di Messina and GNSM del CNRMessinaItaly

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