Resonant dipolar relaxation in poly ( ε -caprolactone)—A thermally stimulated depolarization current study

Resonant dipolar relaxation in poly( ε -caprolactone) (PCL) is reported using thermally stimulated discharge current spectroscopy. PCL is a bio-medically known shape memory polymer having a well defined γ , β , α , and α ′ relaxations, respectively, centered around 125 K, 170 K, 220 K, and 270 K as...

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Bibliographic Details
Published in:Journal of applied physics 2016-07, Vol.120 (3)
Main Authors: Patidar, M. M., Jain, D., Nath, R., Ganesan, V.
Format: Article
Language:English
Subjects:
Activation energy
Applied physics
Deoxidizing
Polycaprolactone
Shape memory
Thermally stimulated depolarization current
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Summary:Resonant dipolar relaxation in poly( ε -caprolactone) (PCL) is reported using thermally stimulated discharge current spectroscopy. PCL is a bio-medically known shape memory polymer having a well defined γ , β , α , and α ′ relaxations, respectively, centered around 125 K, 170 K, 220 K, and 270 K as seen by the measurements. By employing a new protocol variable poling temperature at constant freezing temperature, resonant dipolar relaxation in PCL could be induced, especially in the vicinity of α relaxation. Such a protocol is useful in de-convoluting the features in a more meaningful fashion. By an analysis of activation process, we could show a clear contrast enhancement of the dynamics of the participating dipoles by means of a minimum in the activation energies situated around the glass transition region. The relevant parameters of interest such as activation energies and relaxation times are estimated and discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4959132