Journal Article

FZJ-2015-01303

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png 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

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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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Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
2. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
3. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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