English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The emergence of the solid state in glass-forming materials upon cooling isaccompanied by changes in both thermodynamic and viscoelastic properties and bya precipitous drop in fluidity. Here, we investigate changes in basic elasticproperties upon cooling in a family of simulated polymer fluids, ascharacterized by a number of stiffness measures. We show that $\tau_{\alpha}$can be expressed quantitatively both in terms of measures of the material``stiffness'', $G_p$ and $\langle u^2 \rangle$, and the extent $L$ ofcooperative particle exchange motion in the form of strings, establishing adirect relation between the growth of emergent elasticity and collectivemotion. Moreover, the macroscopic stiffness parameters, $G_p$, $B$, and $f_{s,q^*}$, can all be expressed quantitatively in terms of the molecular scalestiffness parameter, $k_{\mathrm{B}}T / \langle u^2 \rangle$ with$k_{\mathrm{B}}$ being Boltzmann's constant, and we discuss the thermodynamicscaling of these properties. We also find that $G_p$ is related to the cohesiveenergy density $\Pi_{\mathrm{CED}}$, pointing to the critical importance ofattractive interactions in the elasticity and dynamics of glass-formingliquids. Finally, we discuss fluctuations in the local stiffness parameter as aquantitative measure of elastic heterogeneity and their significance forunderstanding both the linear and nonlinear elastic properties of glassymaterials.

Parallel Emergence of Rigidity and Collective Motion in a Family of Simulated Glass-Forming Polymer Fluids