Secondary Relaxations in Polymers Containing Phenyl Rings

  • Franz Zahradnik

Abstract

The dynamic mechanical behaviour of bisphenol-A-polycarbonat (PC), polyarylsulfon (PES), polyetherimid (PEI), polyamidimid (PAI) and polyaryletheretherketon (PEEK) has been investigated in the temperature range between -170 and +270 °C and generally two decades around 1 Hz on the frequency axis. Although there are great differences in the chemical structure in regard of their repeating units, all polymers investigated show a maximum in mechanical damping between -100 and -90 °C at an interpolated frequency of 1 Hz. Significant differences in the damping behaviour were found at higher temperatures. While PC, PEEK and PES have shoulders in the neighborhood of 0 °C and a broad minimum around +100 °C, both polyimids are characterised by wide maxima from -20 °C up to their glass rubber transition.

Keywords

Phenyl Ring Aromatic Polymer Tetracarboxylic Acid Secondary Relaxation Dynamic Mechanical Behaviour 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishers Ltd 1990

Authors and Affiliations

  • Franz Zahradnik
    • 1
  1. 1.Institute of Material Sciencechair for Polymers University Erlangen-NürnbergErlangenGermany

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