Rheological Behaviors of Polymers with Nanoparticles Tethered at Each End

The polymer with nanoparticles tethered at each end is a unique model for unraveling the effect of chain ends on the polymer dynamics. We investigated the rheological behavior of this kind of polymer by using nonequilibrium molecular dynamics simulation. The effect of polymer lengths and nanoparticl...

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Bibliographic Details
Published in:Chinese journal of polymer science 2024-03, Vol.42 (3), p.400-406
Main Authors: Zhang, Song-Qi, Wang, Wen-Qing, Lin, Jia-Ping, Wang, Li-Quan
Format: Article
Language:English
Subjects:
Chains (polymeric)
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Molecular dynamics
Nanoparticles
Polymer Sciences
Polymers
Research Article
Rheological properties
Rheology
Shear thinning (liquids)
Viscosity
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Summary:The polymer with nanoparticles tethered at each end is a unique model for unraveling the effect of chain ends on the polymer dynamics. We investigated the rheological behavior of this kind of polymer by using nonequilibrium molecular dynamics simulation. The effect of polymer lengths and nanoparticle radii on the complex moduli and viscosity was examined. The dependence of complex moduli on the frequency becomes less pronounced as the polymer is short or the nanoparticle is large. The shear thinning behavior was revealed for these systems, and the scaling exponent of complex viscosity with respect to the frequency was found to change from −1/2 to −3/4 as the polymer shortens or the nanoparticle enlarges. The rheological behavior was further explained by analyzing the mean square distance of nanoparticles. The simulation results were compared with the existing experimental finding, showing an agreement. The work provides information for understanding the chain end effect on polymer rheology.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-023-3052-x