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Anomalous molecular weight dependence of chain dynamics in unentangled polymer blends with strong dynamic asymmetry

AutorArrese-Igor, Silvia ; Alegría, Ángel ; Moreno Segurado, Ángel J. ; Colmenero de León, Juan
Fecha de publicación2012
EditorRoyal Society of Chemistry (Great Britain)
CitaciónSoft Matter 8(14): 3739-3742 (2012)
ResumenWe address the general question of how the molecular weight dependence of chain dynamics in unentangled polymers is modified by blending. By dielectric spectroscopy we measure the normal mode relaxation of polyisoprene in blends with a slower component of poly(ter-butylstyrene). Unentangled polyisoprene in the blend exhibits strong deviations from Rouse scaling, approaching 'entangled-like' behavior at low temperatures in concomitance with the increase of the dynamic asymmetry in the blend. The obtained results are discussed in the framework of the generalized Langevin equation formalism. On this basis, a non trivial relationship between the molecular weight dependence of the longest chain relaxation time and the nonexponentiality of the corresponding Rouse correlator is found. This result is confirmed by molecular dynamics simulations. © 2012 The Royal Society of Chemistry.
Versión del editorhttp://dx.doi.org/10.1039/C2SM07451F
URIhttp://hdl.handle.net/10261/50481
DOI10.1039/C2SM07451F
Identificadoresdoi: 10.1039/C2SM07451F
issn: 1744-683X
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