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Issue 14, 2012
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Anomalous molecular weight dependence of chain dynamics in unentangled polymer blends with strong dynamic asymmetry

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Abstract

We 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.

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

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Article information


Submitted
22 Dec 2011
Accepted
22 Feb 2012
First published
02 Mar 2012

Soft Matter, 2012,8, 3739-3742
Article type
Communication

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

S. Arrese-Igor, A. Alegría, A. J. Moreno and J. Colmenero, Soft Matter, 2012, 8, 3739
DOI: 10.1039/C2SM07451F

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