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Rheological behavior in the transient state of PP/EPDM blends with carbon nanofillers
Authors:Roberto?Zitzumbo-Guzman,Felipe?Avalos-Belmontes,Luis?F.?Ramos-De Valle,Jose?C.?Ortiz-Cisneros,Sergio?Alonso-Romero,Anayansi?Estrada-Monje  mailto:aestrada@ciatec.mx"   title="  aestrada@ciatec.mx"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author
Affiliation:1.CIATEC A.C.,Leon,Mexico;2.Facultad de Ciencias Químicas,Universidad Autónoma de Coahuila (FCQ-UAC),Saltillo,Mexico;3.CIQA,Saltillo,Mexico
Abstract:
The rheological properties in the transient state of PP/EPDM blends with carbon nanofillers had been studied. The carbon nanofillers were incorporated into molten EPDM in an internal mixer at 150 °C. The rheological variables were determined in rotational rheometry at constant temperature of 200 °C. The results suggest that the magnitude of the difference of the normal stress differences (N1-N2) of PP/EPDM blends through the time, with and without nanofillers, and has a transition cycle from positive to negative values and vice versa, at constant and at zero shear rate in previously sheared samples. At constant shear rate, the transition cycle is random; meanwhile, it is constant at zero shear rate. This behavior is attributed to the polymeric chain movement, considering that the sheared samples have two molecular reorder processes: an immediate mechanism and another one slower. The fastest reorder process is attributed to the polymeric chains entanglement forming non-stable and stressed molecular structures. In the other hand, the second process is referred to the molecular mobility that takes place inside the stressed entangled polymer, in such a way that its structure tends to molecular stability as the rest time increases.
Keywords:
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