In polymer blends where the glass transition temperatures of the two components differ greatly, the segmental alpha-relaxation and the chain dynamics of the faster component exhibit a number of anomalous properties not seen before in homopolymers, and not explainable by conventional theory of polymer dynamics. In the first part of this paper, these anomalous properties are collected altogether and made known. We show their interconnections and emphasize the necessity of explaining all of them together if the objective is to fully solve the problem. In the second part, the predictions from a single theoretical framework, namely, the coupling model, are applied to explain the anomalous properties in toto. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789585]
Unified explanation of the anomalous dynamic properties of highly asymmetric polymer blends
CAPACCIOLI, SIMONE
2013-01-01
Abstract
In polymer blends where the glass transition temperatures of the two components differ greatly, the segmental alpha-relaxation and the chain dynamics of the faster component exhibit a number of anomalous properties not seen before in homopolymers, and not explainable by conventional theory of polymer dynamics. In the first part of this paper, these anomalous properties are collected altogether and made known. We show their interconnections and emphasize the necessity of explaining all of them together if the objective is to fully solve the problem. In the second part, the predictions from a single theoretical framework, namely, the coupling model, are applied to explain the anomalous properties in toto. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789585]I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
