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Dielectric Study of Relaxation Processes of Polynorbornene Derivatives
Author(s) -
Danch Adam,
Kocot Antoni,
Zioło Jerzy,
Stelzer Franz
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010101)202:1<105::aid-macp105>3.0.co;2-1
Subject(s) - dielectric , polymer chemistry , relaxation (psychology) , materials science , polymer science , chemistry , optoelectronics , psychology , social psychology
In order to explore the motion of the polar groups of side‐chain liquid crystal polymers with a rigid backbone two polynorbornene derivatives were studied by means of dielectric spectroscopy. The complex dielectric permittivity was measured in a frequency range of 5 Hz–13 MHz and in a temperature range of 20°C–160°C. The results are compared with the mechanical spectra and the origin of four relaxations is discussed. It is postulated that this is a complex system which one can treat as a system built up by the domains of nematic and smectic order. The motion of mesogen about its short molecular axis is characterised by the activation enthalpy of 85 kJ/mol, in the case of nematic order, and 136 kJ/mol, in the case of smectic order.