Rheology of Concentrated Polymer/Ionic Liquid Solutions: An Anomalous Plasticizing Effect and a Universality in Nonlinear Shear Rheology.

ABSTRACT: An anomalous plasticizing effect was observed in polymer/ionic liquid (IL) solutions by applying broad range of rheological techniques. Poly(ethylene oxide)(PEO)/IL solutions exhibit stronger dynamic temperature dependence than pure PEO, which is in conflict with the knowledge that lower-T_g solvent increases the fractional free volume. For poly(methy methacrylate)(PMMA)/IL solutions, the subtle anomaly was detected from the fact that the effective glass transition temperature T_g,eff of PMMA in IL is higher than the prediction of the self-concentration model, while in conventional polymer solutions, T_g,eff follows the original Fox equation. Observations in both solutions reveal retarded segmental dynamics, consistent with a recent simula

SUBMITTER: Liu Z 

PROVIDER: S-EPMC6572180 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature