The segmental and chain relaxation modes in high-cis-polyisoprene as studied by thermally stimulated currents

Mora, Elsa; Moura Ramos, Joaquim J.; Pyckhout-Hintzen, Wim; Diogo, Hermínio P.; Bras, Ana

doi:10.1063/1.4906542

Journal Article

FZJ-2015-01303

The segmental and chain relaxation modes in high-cis-polyisoprene as studied by thermally stimulated currents

Mora, E. (Corresponding Author) ; Bras, A.FZJ* ; Pyckhout-Hintzen, W.FZJ* ; Diogo, H. P. ; Moura Ramos, J. J.

2015
American Institute of Physics Melville, NY

The journal of chemical physics 142(4), 044903 (2015) [10.1063/1.4906542]

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Please use a persistent id in citations: http://hdl.handle.net/2128/19008 doi:10.1063/1.4906542

Abstract: The technique of Thermally Stimulated Currents is used to study the slow molecular mobility in a series of poly (1,4-cis-isoprene) samples with different molecular weights, Mw , and low polydispersity. The technique revealed a high resolution power, particularly useful in the study of the lower molecular weight samples where the chain and the segmental relaxations strongly overlap. The dynamic crossover that is reported for the normal mode by varying the molecular weight is clearly revealed by the thermally stimulated depolarization currents results through the temperature location, TMn , of the normal mode peak, the values of the relaxation time at TMn , τ(TMn ), and the value of the fragility index of the normal mode, mn . The kinetic features of the glass transition relaxation of polyisoprene have also been determined.

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