Evolution of the Dynamics in 1,4-Polyisoprene from a Nearly Constant Loss to a Johari−Goldstein β-Relaxation to the α-Relaxation

The Johari−Goldstein (JG) secondary relaxation, presumed to be universal, has never been seen in 1,4-polyisoprene (PI) by dielectric spectroscopy, despite very many measurements extending over the past half-century. By using a high-resolution capacitance bridge, we are able to show the existence of...

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Veröffentlicht in:	Macromolecules 2004-04, Vol.37 (7), p.2630-2635
Hauptverfasser:	Roland, C. M, Schroeder, M. J, Fontanella, J. J, Ngai, K. L
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Electrical, magnetic and optical properties Exact sciences and technology Organic polymers Physicochemistry of polymers Properties and characterization
Online-Zugang:	Volltext
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