TY  - JOUR
AU  - Mora, Elsa
AU  - Bras, Ana
AU  - Pyckhout-Hintzen, Wim
AU  - Diogo, Hermínio P.
AU  - Moura Ramos, Joaquim J.
TI  - The segmental and chain relaxation modes in high-cis-polyisoprene as studied by thermally stimulated currents
JO  - The journal of chemical physics
VL  - 142
IS  - 4
SN  - 1089-7690
CY  - Melville, NY
PB  - American Institute of Physics
M1  - FZJ-2015-01303
SP  - 044903
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000349018100046
DO  - DOI:10.1063/1.4906542
UR  - https://juser.fz-juelich.de/record/187677
ER  -